1200 lines
47 KiB
Python
1200 lines
47 KiB
Python
# -*- coding: utf-8 -*-
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# There are tests here with unicode string literals and
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# identifiers. There's a code in ast.c that was added because of a
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# failure with a non-ascii-only expression. So, I have tests for
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# that. There are workarounds that would let me run tests for that
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# code without unicode identifiers and strings, but just using them
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# directly seems like the easiest and therefore safest thing to do.
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# Unicode identifiers in tests is allowed by PEP 3131.
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import ast
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import os
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import types
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import decimal
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import unittest
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from test.support import temp_cwd
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from test.support.script_helper import assert_python_failure
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a_global = 'global variable'
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# You could argue that I'm too strict in looking for specific error
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# values with assertRaisesRegex, but without it it's way too easy to
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# make a syntax error in the test strings. Especially with all of the
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# triple quotes, raw strings, backslashes, etc. I think it's a
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# worthwhile tradeoff. When I switched to this method, I found many
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# examples where I wasn't testing what I thought I was.
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class TestCase(unittest.TestCase):
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def assertAllRaise(self, exception_type, regex, error_strings):
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for str in error_strings:
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with self.subTest(str=str):
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with self.assertRaisesRegex(exception_type, regex):
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eval(str)
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def test__format__lookup(self):
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# Make sure __format__ is looked up on the type, not the instance.
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class X:
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def __format__(self, spec):
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return 'class'
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x = X()
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# Add a bound __format__ method to the 'y' instance, but not
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# the 'x' instance.
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y = X()
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y.__format__ = types.MethodType(lambda self, spec: 'instance', y)
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self.assertEqual(f'{y}', format(y))
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self.assertEqual(f'{y}', 'class')
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self.assertEqual(format(x), format(y))
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# __format__ is not called this way, but still make sure it
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# returns what we expect (so we can make sure we're bypassing
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# it).
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self.assertEqual(x.__format__(''), 'class')
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self.assertEqual(y.__format__(''), 'instance')
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# This is how __format__ is actually called.
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self.assertEqual(type(x).__format__(x, ''), 'class')
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self.assertEqual(type(y).__format__(y, ''), 'class')
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def test_ast(self):
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# Inspired by http://bugs.python.org/issue24975
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class X:
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def __init__(self):
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self.called = False
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def __call__(self):
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self.called = True
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return 4
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x = X()
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expr = """
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a = 10
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f'{a * x()}'"""
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t = ast.parse(expr)
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c = compile(t, '', 'exec')
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# Make sure x was not called.
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self.assertFalse(x.called)
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# Actually run the code.
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exec(c)
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# Make sure x was called.
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self.assertTrue(x.called)
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def test_ast_line_numbers(self):
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expr = """
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a = 10
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f'{a * x()}'"""
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t = ast.parse(expr)
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self.assertEqual(type(t), ast.Module)
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self.assertEqual(len(t.body), 2)
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# check `a = 10`
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self.assertEqual(type(t.body[0]), ast.Assign)
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self.assertEqual(t.body[0].lineno, 2)
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# check `f'...'`
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self.assertEqual(type(t.body[1]), ast.Expr)
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self.assertEqual(type(t.body[1].value), ast.JoinedStr)
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self.assertEqual(len(t.body[1].value.values), 1)
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self.assertEqual(type(t.body[1].value.values[0]), ast.FormattedValue)
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self.assertEqual(t.body[1].lineno, 3)
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self.assertEqual(t.body[1].value.lineno, 3)
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self.assertEqual(t.body[1].value.values[0].lineno, 3)
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# check the binop location
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binop = t.body[1].value.values[0].value
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self.assertEqual(type(binop), ast.BinOp)
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self.assertEqual(type(binop.left), ast.Name)
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self.assertEqual(type(binop.op), ast.Mult)
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self.assertEqual(type(binop.right), ast.Call)
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self.assertEqual(binop.lineno, 3)
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self.assertEqual(binop.left.lineno, 3)
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self.assertEqual(binop.right.lineno, 3)
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self.assertEqual(binop.col_offset, 3)
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self.assertEqual(binop.left.col_offset, 3)
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self.assertEqual(binop.right.col_offset, 7)
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def test_ast_line_numbers_multiple_formattedvalues(self):
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expr = """
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f'no formatted values'
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f'eggs {a * x()} spam {b + y()}'"""
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t = ast.parse(expr)
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self.assertEqual(type(t), ast.Module)
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self.assertEqual(len(t.body), 2)
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# check `f'no formatted value'`
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self.assertEqual(type(t.body[0]), ast.Expr)
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self.assertEqual(type(t.body[0].value), ast.JoinedStr)
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self.assertEqual(t.body[0].lineno, 2)
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# check `f'...'`
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self.assertEqual(type(t.body[1]), ast.Expr)
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self.assertEqual(type(t.body[1].value), ast.JoinedStr)
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self.assertEqual(len(t.body[1].value.values), 4)
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self.assertEqual(type(t.body[1].value.values[0]), ast.Constant)
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self.assertEqual(type(t.body[1].value.values[0].value), str)
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self.assertEqual(type(t.body[1].value.values[1]), ast.FormattedValue)
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self.assertEqual(type(t.body[1].value.values[2]), ast.Constant)
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self.assertEqual(type(t.body[1].value.values[2].value), str)
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self.assertEqual(type(t.body[1].value.values[3]), ast.FormattedValue)
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self.assertEqual(t.body[1].lineno, 3)
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self.assertEqual(t.body[1].value.lineno, 3)
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self.assertEqual(t.body[1].value.values[0].lineno, 3)
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self.assertEqual(t.body[1].value.values[1].lineno, 3)
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self.assertEqual(t.body[1].value.values[2].lineno, 3)
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self.assertEqual(t.body[1].value.values[3].lineno, 3)
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# check the first binop location
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binop1 = t.body[1].value.values[1].value
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self.assertEqual(type(binop1), ast.BinOp)
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self.assertEqual(type(binop1.left), ast.Name)
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self.assertEqual(type(binop1.op), ast.Mult)
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self.assertEqual(type(binop1.right), ast.Call)
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self.assertEqual(binop1.lineno, 3)
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self.assertEqual(binop1.left.lineno, 3)
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self.assertEqual(binop1.right.lineno, 3)
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self.assertEqual(binop1.col_offset, 8)
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self.assertEqual(binop1.left.col_offset, 8)
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self.assertEqual(binop1.right.col_offset, 12)
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# check the second binop location
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binop2 = t.body[1].value.values[3].value
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self.assertEqual(type(binop2), ast.BinOp)
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self.assertEqual(type(binop2.left), ast.Name)
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self.assertEqual(type(binop2.op), ast.Add)
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self.assertEqual(type(binop2.right), ast.Call)
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self.assertEqual(binop2.lineno, 3)
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self.assertEqual(binop2.left.lineno, 3)
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self.assertEqual(binop2.right.lineno, 3)
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self.assertEqual(binop2.col_offset, 23)
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self.assertEqual(binop2.left.col_offset, 23)
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self.assertEqual(binop2.right.col_offset, 27)
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def test_ast_line_numbers_nested(self):
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expr = """
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a = 10
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f'{a * f"-{x()}-"}'"""
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t = ast.parse(expr)
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self.assertEqual(type(t), ast.Module)
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self.assertEqual(len(t.body), 2)
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# check `a = 10`
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self.assertEqual(type(t.body[0]), ast.Assign)
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self.assertEqual(t.body[0].lineno, 2)
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# check `f'...'`
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self.assertEqual(type(t.body[1]), ast.Expr)
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self.assertEqual(type(t.body[1].value), ast.JoinedStr)
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self.assertEqual(len(t.body[1].value.values), 1)
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self.assertEqual(type(t.body[1].value.values[0]), ast.FormattedValue)
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self.assertEqual(t.body[1].lineno, 3)
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self.assertEqual(t.body[1].value.lineno, 3)
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self.assertEqual(t.body[1].value.values[0].lineno, 3)
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# check the binop location
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binop = t.body[1].value.values[0].value
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self.assertEqual(type(binop), ast.BinOp)
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self.assertEqual(type(binop.left), ast.Name)
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self.assertEqual(type(binop.op), ast.Mult)
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self.assertEqual(type(binop.right), ast.JoinedStr)
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self.assertEqual(binop.lineno, 3)
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self.assertEqual(binop.left.lineno, 3)
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self.assertEqual(binop.right.lineno, 3)
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self.assertEqual(binop.col_offset, 3)
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self.assertEqual(binop.left.col_offset, 3)
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self.assertEqual(binop.right.col_offset, 7)
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# check the nested call location
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self.assertEqual(len(binop.right.values), 3)
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self.assertEqual(type(binop.right.values[0]), ast.Constant)
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self.assertEqual(type(binop.right.values[0].value), str)
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self.assertEqual(type(binop.right.values[1]), ast.FormattedValue)
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self.assertEqual(type(binop.right.values[2]), ast.Constant)
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self.assertEqual(type(binop.right.values[2].value), str)
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self.assertEqual(binop.right.values[0].lineno, 3)
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self.assertEqual(binop.right.values[1].lineno, 3)
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self.assertEqual(binop.right.values[2].lineno, 3)
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call = binop.right.values[1].value
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self.assertEqual(type(call), ast.Call)
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self.assertEqual(call.lineno, 3)
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self.assertEqual(call.col_offset, 11)
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def test_ast_line_numbers_duplicate_expression(self):
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"""Duplicate expression
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NOTE: this is currently broken, always sets location of the first
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expression.
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"""
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expr = """
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a = 10
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f'{a * x()} {a * x()} {a * x()}'
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"""
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t = ast.parse(expr)
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self.assertEqual(type(t), ast.Module)
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self.assertEqual(len(t.body), 2)
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# check `a = 10`
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self.assertEqual(type(t.body[0]), ast.Assign)
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self.assertEqual(t.body[0].lineno, 2)
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# check `f'...'`
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self.assertEqual(type(t.body[1]), ast.Expr)
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self.assertEqual(type(t.body[1].value), ast.JoinedStr)
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self.assertEqual(len(t.body[1].value.values), 5)
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self.assertEqual(type(t.body[1].value.values[0]), ast.FormattedValue)
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self.assertEqual(type(t.body[1].value.values[1]), ast.Constant)
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self.assertEqual(type(t.body[1].value.values[1].value), str)
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self.assertEqual(type(t.body[1].value.values[2]), ast.FormattedValue)
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self.assertEqual(type(t.body[1].value.values[3]), ast.Constant)
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self.assertEqual(type(t.body[1].value.values[3].value), str)
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self.assertEqual(type(t.body[1].value.values[4]), ast.FormattedValue)
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self.assertEqual(t.body[1].lineno, 3)
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self.assertEqual(t.body[1].value.lineno, 3)
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self.assertEqual(t.body[1].value.values[0].lineno, 3)
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self.assertEqual(t.body[1].value.values[1].lineno, 3)
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self.assertEqual(t.body[1].value.values[2].lineno, 3)
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self.assertEqual(t.body[1].value.values[3].lineno, 3)
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self.assertEqual(t.body[1].value.values[4].lineno, 3)
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# check the first binop location
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binop = t.body[1].value.values[0].value
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self.assertEqual(type(binop), ast.BinOp)
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self.assertEqual(type(binop.left), ast.Name)
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self.assertEqual(type(binop.op), ast.Mult)
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self.assertEqual(type(binop.right), ast.Call)
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self.assertEqual(binop.lineno, 3)
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self.assertEqual(binop.left.lineno, 3)
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self.assertEqual(binop.right.lineno, 3)
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self.assertEqual(binop.col_offset, 3)
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self.assertEqual(binop.left.col_offset, 3)
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self.assertEqual(binop.right.col_offset, 7)
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# check the second binop location
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binop = t.body[1].value.values[2].value
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self.assertEqual(type(binop), ast.BinOp)
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self.assertEqual(type(binop.left), ast.Name)
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self.assertEqual(type(binop.op), ast.Mult)
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self.assertEqual(type(binop.right), ast.Call)
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self.assertEqual(binop.lineno, 3)
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self.assertEqual(binop.left.lineno, 3)
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self.assertEqual(binop.right.lineno, 3)
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self.assertEqual(binop.col_offset, 3) # FIXME: this is wrong
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self.assertEqual(binop.left.col_offset, 3) # FIXME: this is wrong
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self.assertEqual(binop.right.col_offset, 7) # FIXME: this is wrong
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# check the third binop location
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binop = t.body[1].value.values[4].value
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self.assertEqual(type(binop), ast.BinOp)
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self.assertEqual(type(binop.left), ast.Name)
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self.assertEqual(type(binop.op), ast.Mult)
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self.assertEqual(type(binop.right), ast.Call)
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self.assertEqual(binop.lineno, 3)
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self.assertEqual(binop.left.lineno, 3)
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self.assertEqual(binop.right.lineno, 3)
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self.assertEqual(binop.col_offset, 3) # FIXME: this is wrong
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self.assertEqual(binop.left.col_offset, 3) # FIXME: this is wrong
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self.assertEqual(binop.right.col_offset, 7) # FIXME: this is wrong
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def test_ast_line_numbers_multiline_fstring(self):
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# See bpo-30465 for details.
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expr = """
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a = 10
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f'''
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{a
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*
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x()}
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non-important content
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'''
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"""
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t = ast.parse(expr)
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self.assertEqual(type(t), ast.Module)
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self.assertEqual(len(t.body), 2)
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# check `a = 10`
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self.assertEqual(type(t.body[0]), ast.Assign)
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self.assertEqual(t.body[0].lineno, 2)
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# check `f'...'`
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self.assertEqual(type(t.body[1]), ast.Expr)
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self.assertEqual(type(t.body[1].value), ast.JoinedStr)
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self.assertEqual(len(t.body[1].value.values), 3)
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self.assertEqual(type(t.body[1].value.values[0]), ast.Constant)
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self.assertEqual(type(t.body[1].value.values[0].value), str)
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self.assertEqual(type(t.body[1].value.values[1]), ast.FormattedValue)
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self.assertEqual(type(t.body[1].value.values[2]), ast.Constant)
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self.assertEqual(type(t.body[1].value.values[2].value), str)
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self.assertEqual(t.body[1].lineno, 3)
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self.assertEqual(t.body[1].value.lineno, 3)
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self.assertEqual(t.body[1].value.values[0].lineno, 3)
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self.assertEqual(t.body[1].value.values[1].lineno, 3)
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self.assertEqual(t.body[1].value.values[2].lineno, 3)
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self.assertEqual(t.body[1].col_offset, 0)
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self.assertEqual(t.body[1].value.col_offset, 0)
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self.assertEqual(t.body[1].value.values[0].col_offset, 0)
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self.assertEqual(t.body[1].value.values[1].col_offset, 0)
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self.assertEqual(t.body[1].value.values[2].col_offset, 0)
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# NOTE: the following lineno information and col_offset is correct for
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# expressions within FormattedValues.
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binop = t.body[1].value.values[1].value
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self.assertEqual(type(binop), ast.BinOp)
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self.assertEqual(type(binop.left), ast.Name)
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self.assertEqual(type(binop.op), ast.Mult)
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self.assertEqual(type(binop.right), ast.Call)
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self.assertEqual(binop.lineno, 4)
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self.assertEqual(binop.left.lineno, 4)
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self.assertEqual(binop.right.lineno, 6)
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self.assertEqual(binop.col_offset, 4)
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self.assertEqual(binop.left.col_offset, 4)
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self.assertEqual(binop.right.col_offset, 7)
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def test_docstring(self):
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def f():
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f'''Not a docstring'''
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self.assertIsNone(f.__doc__)
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def g():
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'''Not a docstring''' \
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f''
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self.assertIsNone(g.__doc__)
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def test_literal_eval(self):
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with self.assertRaisesRegex(ValueError, 'malformed node or string'):
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ast.literal_eval("f'x'")
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def test_ast_compile_time_concat(self):
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x = ['']
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expr = """x[0] = 'foo' f'{3}'"""
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t = ast.parse(expr)
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c = compile(t, '', 'exec')
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exec(c)
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self.assertEqual(x[0], 'foo3')
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def test_compile_time_concat_errors(self):
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self.assertAllRaise(SyntaxError,
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'cannot mix bytes and nonbytes literals',
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[r"""f'' b''""",
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r"""b'' f''""",
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])
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def test_literal(self):
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self.assertEqual(f'', '')
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self.assertEqual(f'a', 'a')
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self.assertEqual(f' ', ' ')
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def test_unterminated_string(self):
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self.assertAllRaise(SyntaxError, 'f-string: unterminated string',
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[r"""f'{"x'""",
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r"""f'{"x}'""",
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r"""f'{("x'""",
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r"""f'{("x}'""",
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])
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def test_mismatched_parens(self):
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self.assertAllRaise(SyntaxError, r"f-string: closing parenthesis '\}' "
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r"does not match opening parenthesis '\('",
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["f'{((}'",
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])
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self.assertAllRaise(SyntaxError, r"f-string: closing parenthesis '\)' "
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r"does not match opening parenthesis '\['",
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["f'{a[4)}'",
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])
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self.assertAllRaise(SyntaxError, r"f-string: closing parenthesis '\]' "
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r"does not match opening parenthesis '\('",
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["f'{a(4]}'",
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])
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self.assertAllRaise(SyntaxError, r"f-string: closing parenthesis '\}' "
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r"does not match opening parenthesis '\['",
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["f'{a[4}'",
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])
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self.assertAllRaise(SyntaxError, r"f-string: closing parenthesis '\}' "
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r"does not match opening parenthesis '\('",
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["f'{a(4}'",
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])
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self.assertRaises(SyntaxError, eval, "f'{" + "("*500 + "}'")
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def test_double_braces(self):
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self.assertEqual(f'{{', '{')
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self.assertEqual(f'a{{', 'a{')
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self.assertEqual(f'{{b', '{b')
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self.assertEqual(f'a{{b', 'a{b')
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self.assertEqual(f'}}', '}')
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self.assertEqual(f'a}}', 'a}')
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self.assertEqual(f'}}b', '}b')
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self.assertEqual(f'a}}b', 'a}b')
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self.assertEqual(f'{{}}', '{}')
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self.assertEqual(f'a{{}}', 'a{}')
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self.assertEqual(f'{{b}}', '{b}')
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self.assertEqual(f'{{}}c', '{}c')
|
||
self.assertEqual(f'a{{b}}', 'a{b}')
|
||
self.assertEqual(f'a{{}}c', 'a{}c')
|
||
self.assertEqual(f'{{b}}c', '{b}c')
|
||
self.assertEqual(f'a{{b}}c', 'a{b}c')
|
||
|
||
self.assertEqual(f'{{{10}', '{10')
|
||
self.assertEqual(f'}}{10}', '}10')
|
||
self.assertEqual(f'}}{{{10}', '}{10')
|
||
self.assertEqual(f'}}a{{{10}', '}a{10')
|
||
|
||
self.assertEqual(f'{10}{{', '10{')
|
||
self.assertEqual(f'{10}}}', '10}')
|
||
self.assertEqual(f'{10}}}{{', '10}{')
|
||
self.assertEqual(f'{10}}}a{{' '}', '10}a{}')
|
||
|
||
# Inside of strings, don't interpret doubled brackets.
|
||
self.assertEqual(f'{"{{}}"}', '{{}}')
|
||
|
||
self.assertAllRaise(TypeError, 'unhashable type',
|
||
["f'{ {{}} }'", # dict in a set
|
||
])
|
||
|
||
def test_compile_time_concat(self):
|
||
x = 'def'
|
||
self.assertEqual('abc' f'## {x}ghi', 'abc## defghi')
|
||
self.assertEqual('abc' f'{x}' 'ghi', 'abcdefghi')
|
||
self.assertEqual('abc' f'{x}' 'gh' f'i{x:4}', 'abcdefghidef ')
|
||
self.assertEqual('{x}' f'{x}', '{x}def')
|
||
self.assertEqual('{x' f'{x}', '{xdef')
|
||
self.assertEqual('{x}' f'{x}', '{x}def')
|
||
self.assertEqual('{{x}}' f'{x}', '{{x}}def')
|
||
self.assertEqual('{{x' f'{x}', '{{xdef')
|
||
self.assertEqual('x}}' f'{x}', 'x}}def')
|
||
self.assertEqual(f'{x}' 'x}}', 'defx}}')
|
||
self.assertEqual(f'{x}' '', 'def')
|
||
self.assertEqual('' f'{x}' '', 'def')
|
||
self.assertEqual('' f'{x}', 'def')
|
||
self.assertEqual(f'{x}' '2', 'def2')
|
||
self.assertEqual('1' f'{x}' '2', '1def2')
|
||
self.assertEqual('1' f'{x}', '1def')
|
||
self.assertEqual(f'{x}' f'-{x}', 'def-def')
|
||
self.assertEqual('' f'', '')
|
||
self.assertEqual('' f'' '', '')
|
||
self.assertEqual('' f'' '' f'', '')
|
||
self.assertEqual(f'', '')
|
||
self.assertEqual(f'' '', '')
|
||
self.assertEqual(f'' '' f'', '')
|
||
self.assertEqual(f'' '' f'' '', '')
|
||
|
||
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
|
||
["f'{3' f'}'", # can't concat to get a valid f-string
|
||
])
|
||
|
||
def test_comments(self):
|
||
# These aren't comments, since they're in strings.
|
||
d = {'#': 'hash'}
|
||
self.assertEqual(f'{"#"}', '#')
|
||
self.assertEqual(f'{d["#"]}', 'hash')
|
||
|
||
self.assertAllRaise(SyntaxError, "f-string expression part cannot include '#'",
|
||
["f'{1#}'", # error because the expression becomes "(1#)"
|
||
"f'{3(#)}'",
|
||
"f'{#}'",
|
||
])
|
||
self.assertAllRaise(SyntaxError, r"f-string: unmatched '\)'",
|
||
["f'{)#}'", # When wrapped in parens, this becomes
|
||
# '()#)'. Make sure that doesn't compile.
|
||
])
|
||
|
||
def test_many_expressions(self):
|
||
# Create a string with many expressions in it. Note that
|
||
# because we have a space in here as a literal, we're actually
|
||
# going to use twice as many ast nodes: one for each literal
|
||
# plus one for each expression.
|
||
def build_fstr(n, extra=''):
|
||
return "f'" + ('{x} ' * n) + extra + "'"
|
||
|
||
x = 'X'
|
||
width = 1
|
||
|
||
# Test around 256.
|
||
for i in range(250, 260):
|
||
self.assertEqual(eval(build_fstr(i)), (x+' ')*i)
|
||
|
||
# Test concatenating 2 largs fstrings.
|
||
self.assertEqual(eval(build_fstr(255)*256), (x+' ')*(255*256))
|
||
|
||
s = build_fstr(253, '{x:{width}} ')
|
||
self.assertEqual(eval(s), (x+' ')*254)
|
||
|
||
# Test lots of expressions and constants, concatenated.
|
||
s = "f'{1}' 'x' 'y'" * 1024
|
||
self.assertEqual(eval(s), '1xy' * 1024)
|
||
|
||
def test_format_specifier_expressions(self):
|
||
width = 10
|
||
precision = 4
|
||
value = decimal.Decimal('12.34567')
|
||
self.assertEqual(f'result: {value:{width}.{precision}}', 'result: 12.35')
|
||
self.assertEqual(f'result: {value:{width!r}.{precision}}', 'result: 12.35')
|
||
self.assertEqual(f'result: {value:{width:0}.{precision:1}}', 'result: 12.35')
|
||
self.assertEqual(f'result: {value:{1}{0:0}.{precision:1}}', 'result: 12.35')
|
||
self.assertEqual(f'result: {value:{ 1}{ 0:0}.{ precision:1}}', 'result: 12.35')
|
||
self.assertEqual(f'{10:#{1}0x}', ' 0xa')
|
||
self.assertEqual(f'{10:{"#"}1{0}{"x"}}', ' 0xa')
|
||
self.assertEqual(f'{-10:-{"#"}1{0}x}', ' -0xa')
|
||
self.assertEqual(f'{-10:{"-"}#{1}0{"x"}}', ' -0xa')
|
||
self.assertEqual(f'{10:#{3 != {4:5} and width}x}', ' 0xa')
|
||
|
||
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
|
||
["""f'{"s"!r{":10"}}'""",
|
||
|
||
# This looks like a nested format spec.
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError, "invalid syntax",
|
||
[# Invalid syntax inside a nested spec.
|
||
"f'{4:{/5}}'",
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError, "f-string: expressions nested too deeply",
|
||
[# Can't nest format specifiers.
|
||
"f'result: {value:{width:{0}}.{precision:1}}'",
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError, 'f-string: invalid conversion character',
|
||
[# No expansion inside conversion or for
|
||
# the : or ! itself.
|
||
"""f'{"s"!{"r"}}'""",
|
||
])
|
||
|
||
def test_side_effect_order(self):
|
||
class X:
|
||
def __init__(self):
|
||
self.i = 0
|
||
def __format__(self, spec):
|
||
self.i += 1
|
||
return str(self.i)
|
||
|
||
x = X()
|
||
self.assertEqual(f'{x} {x}', '1 2')
|
||
|
||
def test_missing_expression(self):
|
||
self.assertAllRaise(SyntaxError, 'f-string: empty expression not allowed',
|
||
["f'{}'",
|
||
"f'{ }'"
|
||
"f' {} '",
|
||
"f'{!r}'",
|
||
"f'{ !r}'",
|
||
"f'{10:{ }}'",
|
||
"f' { } '",
|
||
|
||
# The Python parser ignores also the following
|
||
# whitespace characters in additional to a space.
|
||
"f'''{\t\f\r\n}'''",
|
||
|
||
# Catch the empty expression before the
|
||
# invalid conversion.
|
||
"f'{!x}'",
|
||
"f'{ !xr}'",
|
||
"f'{!x:}'",
|
||
"f'{!x:a}'",
|
||
"f'{ !xr:}'",
|
||
"f'{ !xr:a}'",
|
||
|
||
"f'{!}'",
|
||
"f'{:}'",
|
||
|
||
# We find the empty expression before the
|
||
# missing closing brace.
|
||
"f'{!'",
|
||
"f'{!s:'",
|
||
"f'{:'",
|
||
"f'{:x'",
|
||
])
|
||
|
||
# Different error message is raised for other whitespace characters.
|
||
self.assertAllRaise(SyntaxError, r"invalid non-printable character U\+00A0",
|
||
["f'''{\xa0}'''",
|
||
"\xa0",
|
||
])
|
||
|
||
def test_parens_in_expressions(self):
|
||
self.assertEqual(f'{3,}', '(3,)')
|
||
|
||
# Add these because when an expression is evaluated, parens
|
||
# are added around it. But we shouldn't go from an invalid
|
||
# expression to a valid one. The added parens are just
|
||
# supposed to allow whitespace (including newlines).
|
||
self.assertAllRaise(SyntaxError, 'invalid syntax',
|
||
["f'{,}'",
|
||
"f'{,}'", # this is (,), which is an error
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError, r"f-string: unmatched '\)'",
|
||
["f'{3)+(4}'",
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError, 'EOL while scanning string literal',
|
||
["f'{\n}'",
|
||
])
|
||
|
||
def test_backslashes_in_string_part(self):
|
||
self.assertEqual(f'\t', '\t')
|
||
self.assertEqual(r'\t', '\\t')
|
||
self.assertEqual(rf'\t', '\\t')
|
||
self.assertEqual(f'{2}\t', '2\t')
|
||
self.assertEqual(f'{2}\t{3}', '2\t3')
|
||
self.assertEqual(f'\t{3}', '\t3')
|
||
|
||
self.assertEqual(f'\u0394', '\u0394')
|
||
self.assertEqual(r'\u0394', '\\u0394')
|
||
self.assertEqual(rf'\u0394', '\\u0394')
|
||
self.assertEqual(f'{2}\u0394', '2\u0394')
|
||
self.assertEqual(f'{2}\u0394{3}', '2\u03943')
|
||
self.assertEqual(f'\u0394{3}', '\u03943')
|
||
|
||
self.assertEqual(f'\U00000394', '\u0394')
|
||
self.assertEqual(r'\U00000394', '\\U00000394')
|
||
self.assertEqual(rf'\U00000394', '\\U00000394')
|
||
self.assertEqual(f'{2}\U00000394', '2\u0394')
|
||
self.assertEqual(f'{2}\U00000394{3}', '2\u03943')
|
||
self.assertEqual(f'\U00000394{3}', '\u03943')
|
||
|
||
self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}', '\u0394')
|
||
self.assertEqual(f'{2}\N{GREEK CAPITAL LETTER DELTA}', '2\u0394')
|
||
self.assertEqual(f'{2}\N{GREEK CAPITAL LETTER DELTA}{3}', '2\u03943')
|
||
self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}{3}', '\u03943')
|
||
self.assertEqual(f'2\N{GREEK CAPITAL LETTER DELTA}', '2\u0394')
|
||
self.assertEqual(f'2\N{GREEK CAPITAL LETTER DELTA}3', '2\u03943')
|
||
self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}3', '\u03943')
|
||
|
||
self.assertEqual(f'\x20', ' ')
|
||
self.assertEqual(r'\x20', '\\x20')
|
||
self.assertEqual(rf'\x20', '\\x20')
|
||
self.assertEqual(f'{2}\x20', '2 ')
|
||
self.assertEqual(f'{2}\x20{3}', '2 3')
|
||
self.assertEqual(f'\x20{3}', ' 3')
|
||
|
||
self.assertEqual(f'2\x20', '2 ')
|
||
self.assertEqual(f'2\x203', '2 3')
|
||
self.assertEqual(f'\x203', ' 3')
|
||
|
||
with self.assertWarns(DeprecationWarning): # invalid escape sequence
|
||
value = eval(r"f'\{6*7}'")
|
||
self.assertEqual(value, '\\42')
|
||
self.assertEqual(f'\\{6*7}', '\\42')
|
||
self.assertEqual(fr'\{6*7}', '\\42')
|
||
|
||
AMPERSAND = 'spam'
|
||
# Get the right unicode character (&), or pick up local variable
|
||
# depending on the number of backslashes.
|
||
self.assertEqual(f'\N{AMPERSAND}', '&')
|
||
self.assertEqual(f'\\N{AMPERSAND}', '\\Nspam')
|
||
self.assertEqual(fr'\N{AMPERSAND}', '\\Nspam')
|
||
self.assertEqual(f'\\\N{AMPERSAND}', '\\&')
|
||
|
||
def test_misformed_unicode_character_name(self):
|
||
# These test are needed because unicode names are parsed
|
||
# differently inside f-strings.
|
||
self.assertAllRaise(SyntaxError, r"\(unicode error\) 'unicodeescape' codec can't decode bytes in position .*: malformed \\N character escape",
|
||
[r"f'\N'",
|
||
r"f'\N{'",
|
||
r"f'\N{GREEK CAPITAL LETTER DELTA'",
|
||
|
||
# Here are the non-f-string versions,
|
||
# which should give the same errors.
|
||
r"'\N'",
|
||
r"'\N{'",
|
||
r"'\N{GREEK CAPITAL LETTER DELTA'",
|
||
])
|
||
|
||
def test_no_backslashes_in_expression_part(self):
|
||
self.assertAllRaise(SyntaxError, 'f-string expression part cannot include a backslash',
|
||
[r"f'{\'a\'}'",
|
||
r"f'{\t3}'",
|
||
r"f'{\}'",
|
||
r"rf'{\'a\'}'",
|
||
r"rf'{\t3}'",
|
||
r"rf'{\}'",
|
||
r"""rf'{"\N{LEFT CURLY BRACKET}"}'""",
|
||
r"f'{\n}'",
|
||
])
|
||
|
||
def test_no_escapes_for_braces(self):
|
||
"""
|
||
Only literal curly braces begin an expression.
|
||
"""
|
||
# \x7b is '{'.
|
||
self.assertEqual(f'\x7b1+1}}', '{1+1}')
|
||
self.assertEqual(f'\x7b1+1', '{1+1')
|
||
self.assertEqual(f'\u007b1+1', '{1+1')
|
||
self.assertEqual(f'\N{LEFT CURLY BRACKET}1+1\N{RIGHT CURLY BRACKET}', '{1+1}')
|
||
|
||
def test_newlines_in_expressions(self):
|
||
self.assertEqual(f'{0}', '0')
|
||
self.assertEqual(rf'''{3+
|
||
4}''', '7')
|
||
|
||
def test_lambda(self):
|
||
x = 5
|
||
self.assertEqual(f'{(lambda y:x*y)("8")!r}', "'88888'")
|
||
self.assertEqual(f'{(lambda y:x*y)("8")!r:10}', "'88888' ")
|
||
self.assertEqual(f'{(lambda y:x*y)("8"):10}', "88888 ")
|
||
|
||
# lambda doesn't work without parens, because the colon
|
||
# makes the parser think it's a format_spec
|
||
self.assertAllRaise(SyntaxError, 'invalid syntax',
|
||
["f'{lambda x:x}'",
|
||
])
|
||
|
||
def test_yield(self):
|
||
# Not terribly useful, but make sure the yield turns
|
||
# a function into a generator
|
||
def fn(y):
|
||
f'y:{yield y*2}'
|
||
f'{yield}'
|
||
|
||
g = fn(4)
|
||
self.assertEqual(next(g), 8)
|
||
self.assertEqual(next(g), None)
|
||
|
||
def test_yield_send(self):
|
||
def fn(x):
|
||
yield f'x:{yield (lambda i: x * i)}'
|
||
|
||
g = fn(10)
|
||
the_lambda = next(g)
|
||
self.assertEqual(the_lambda(4), 40)
|
||
self.assertEqual(g.send('string'), 'x:string')
|
||
|
||
def test_expressions_with_triple_quoted_strings(self):
|
||
self.assertEqual(f"{'''x'''}", 'x')
|
||
self.assertEqual(f"{'''eric's'''}", "eric's")
|
||
|
||
# Test concatenation within an expression
|
||
self.assertEqual(f'{"x" """eric"s""" "y"}', 'xeric"sy')
|
||
self.assertEqual(f'{"x" """eric"s"""}', 'xeric"s')
|
||
self.assertEqual(f'{"""eric"s""" "y"}', 'eric"sy')
|
||
self.assertEqual(f'{"""x""" """eric"s""" "y"}', 'xeric"sy')
|
||
self.assertEqual(f'{"""x""" """eric"s""" """y"""}', 'xeric"sy')
|
||
self.assertEqual(f'{r"""x""" """eric"s""" """y"""}', 'xeric"sy')
|
||
|
||
def test_multiple_vars(self):
|
||
x = 98
|
||
y = 'abc'
|
||
self.assertEqual(f'{x}{y}', '98abc')
|
||
|
||
self.assertEqual(f'X{x}{y}', 'X98abc')
|
||
self.assertEqual(f'{x}X{y}', '98Xabc')
|
||
self.assertEqual(f'{x}{y}X', '98abcX')
|
||
|
||
self.assertEqual(f'X{x}Y{y}', 'X98Yabc')
|
||
self.assertEqual(f'X{x}{y}Y', 'X98abcY')
|
||
self.assertEqual(f'{x}X{y}Y', '98XabcY')
|
||
|
||
self.assertEqual(f'X{x}Y{y}Z', 'X98YabcZ')
|
||
|
||
def test_closure(self):
|
||
def outer(x):
|
||
def inner():
|
||
return f'x:{x}'
|
||
return inner
|
||
|
||
self.assertEqual(outer('987')(), 'x:987')
|
||
self.assertEqual(outer(7)(), 'x:7')
|
||
|
||
def test_arguments(self):
|
||
y = 2
|
||
def f(x, width):
|
||
return f'x={x*y:{width}}'
|
||
|
||
self.assertEqual(f('foo', 10), 'x=foofoo ')
|
||
x = 'bar'
|
||
self.assertEqual(f(10, 10), 'x= 20')
|
||
|
||
def test_locals(self):
|
||
value = 123
|
||
self.assertEqual(f'v:{value}', 'v:123')
|
||
|
||
def test_missing_variable(self):
|
||
with self.assertRaises(NameError):
|
||
f'v:{value}'
|
||
|
||
def test_missing_format_spec(self):
|
||
class O:
|
||
def __format__(self, spec):
|
||
if not spec:
|
||
return '*'
|
||
return spec
|
||
|
||
self.assertEqual(f'{O():x}', 'x')
|
||
self.assertEqual(f'{O()}', '*')
|
||
self.assertEqual(f'{O():}', '*')
|
||
|
||
self.assertEqual(f'{3:}', '3')
|
||
self.assertEqual(f'{3!s:}', '3')
|
||
|
||
def test_global(self):
|
||
self.assertEqual(f'g:{a_global}', 'g:global variable')
|
||
self.assertEqual(f'g:{a_global!r}', "g:'global variable'")
|
||
|
||
a_local = 'local variable'
|
||
self.assertEqual(f'g:{a_global} l:{a_local}',
|
||
'g:global variable l:local variable')
|
||
self.assertEqual(f'g:{a_global!r}',
|
||
"g:'global variable'")
|
||
self.assertEqual(f'g:{a_global} l:{a_local!r}',
|
||
"g:global variable l:'local variable'")
|
||
|
||
self.assertIn("module 'unittest' from", f'{unittest}')
|
||
|
||
def test_shadowed_global(self):
|
||
a_global = 'really a local'
|
||
self.assertEqual(f'g:{a_global}', 'g:really a local')
|
||
self.assertEqual(f'g:{a_global!r}', "g:'really a local'")
|
||
|
||
a_local = 'local variable'
|
||
self.assertEqual(f'g:{a_global} l:{a_local}',
|
||
'g:really a local l:local variable')
|
||
self.assertEqual(f'g:{a_global!r}',
|
||
"g:'really a local'")
|
||
self.assertEqual(f'g:{a_global} l:{a_local!r}',
|
||
"g:really a local l:'local variable'")
|
||
|
||
def test_call(self):
|
||
def foo(x):
|
||
return 'x=' + str(x)
|
||
|
||
self.assertEqual(f'{foo(10)}', 'x=10')
|
||
|
||
def test_nested_fstrings(self):
|
||
y = 5
|
||
self.assertEqual(f'{f"{0}"*3}', '000')
|
||
self.assertEqual(f'{f"{y}"*3}', '555')
|
||
|
||
def test_invalid_string_prefixes(self):
|
||
single_quote_cases = ["fu''",
|
||
"uf''",
|
||
"Fu''",
|
||
"fU''",
|
||
"Uf''",
|
||
"uF''",
|
||
"ufr''",
|
||
"urf''",
|
||
"fur''",
|
||
"fru''",
|
||
"rfu''",
|
||
"ruf''",
|
||
"FUR''",
|
||
"Fur''",
|
||
"fb''",
|
||
"fB''",
|
||
"Fb''",
|
||
"FB''",
|
||
"bf''",
|
||
"bF''",
|
||
"Bf''",
|
||
"BF''",]
|
||
double_quote_cases = [case.replace("'", '"') for case in single_quote_cases]
|
||
self.assertAllRaise(SyntaxError, 'unexpected EOF while parsing',
|
||
single_quote_cases + double_quote_cases)
|
||
|
||
def test_leading_trailing_spaces(self):
|
||
self.assertEqual(f'{ 3}', '3')
|
||
self.assertEqual(f'{ 3}', '3')
|
||
self.assertEqual(f'{3 }', '3')
|
||
self.assertEqual(f'{3 }', '3')
|
||
|
||
self.assertEqual(f'expr={ {x: y for x, y in [(1, 2), ]}}',
|
||
'expr={1: 2}')
|
||
self.assertEqual(f'expr={ {x: y for x, y in [(1, 2), ]} }',
|
||
'expr={1: 2}')
|
||
|
||
def test_not_equal(self):
|
||
# There's a special test for this because there's a special
|
||
# case in the f-string parser to look for != as not ending an
|
||
# expression. Normally it would, while looking for !s or !r.
|
||
|
||
self.assertEqual(f'{3!=4}', 'True')
|
||
self.assertEqual(f'{3!=4:}', 'True')
|
||
self.assertEqual(f'{3!=4!s}', 'True')
|
||
self.assertEqual(f'{3!=4!s:.3}', 'Tru')
|
||
|
||
def test_equal_equal(self):
|
||
# Because an expression ending in = has special meaning,
|
||
# there's a special test for ==. Make sure it works.
|
||
|
||
self.assertEqual(f'{0==1}', 'False')
|
||
|
||
def test_conversions(self):
|
||
self.assertEqual(f'{3.14:10.10}', ' 3.14')
|
||
self.assertEqual(f'{3.14!s:10.10}', '3.14 ')
|
||
self.assertEqual(f'{3.14!r:10.10}', '3.14 ')
|
||
self.assertEqual(f'{3.14!a:10.10}', '3.14 ')
|
||
|
||
self.assertEqual(f'{"a"}', 'a')
|
||
self.assertEqual(f'{"a"!r}', "'a'")
|
||
self.assertEqual(f'{"a"!a}', "'a'")
|
||
|
||
# Not a conversion.
|
||
self.assertEqual(f'{"a!r"}', "a!r")
|
||
|
||
# Not a conversion, but show that ! is allowed in a format spec.
|
||
self.assertEqual(f'{3.14:!<10.10}', '3.14!!!!!!')
|
||
|
||
self.assertAllRaise(SyntaxError, 'f-string: invalid conversion character',
|
||
["f'{3!g}'",
|
||
"f'{3!A}'",
|
||
"f'{3!3}'",
|
||
"f'{3!G}'",
|
||
"f'{3!!}'",
|
||
"f'{3!:}'",
|
||
"f'{3! s}'", # no space before conversion char
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
|
||
["f'{x!s{y}}'",
|
||
"f'{3!ss}'",
|
||
"f'{3!ss:}'",
|
||
"f'{3!ss:s}'",
|
||
])
|
||
|
||
def test_assignment(self):
|
||
self.assertAllRaise(SyntaxError, 'invalid syntax',
|
||
["f'' = 3",
|
||
"f'{0}' = x",
|
||
"f'{x}' = x",
|
||
])
|
||
|
||
def test_del(self):
|
||
self.assertAllRaise(SyntaxError, 'invalid syntax',
|
||
["del f''",
|
||
"del '' f''",
|
||
])
|
||
|
||
def test_mismatched_braces(self):
|
||
self.assertAllRaise(SyntaxError, "f-string: single '}' is not allowed",
|
||
["f'{{}'",
|
||
"f'{{}}}'",
|
||
"f'}'",
|
||
"f'x}'",
|
||
"f'x}x'",
|
||
r"f'\u007b}'",
|
||
|
||
# Can't have { or } in a format spec.
|
||
"f'{3:}>10}'",
|
||
"f'{3:}}>10}'",
|
||
])
|
||
|
||
self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
|
||
["f'{3:{{>10}'",
|
||
"f'{3'",
|
||
"f'{3!'",
|
||
"f'{3:'",
|
||
"f'{3!s'",
|
||
"f'{3!s:'",
|
||
"f'{3!s:3'",
|
||
"f'x{'",
|
||
"f'x{x'",
|
||
"f'{x'",
|
||
"f'{3:s'",
|
||
"f'{{{'",
|
||
"f'{{}}{'",
|
||
"f'{'",
|
||
])
|
||
|
||
# But these are just normal strings.
|
||
self.assertEqual(f'{"{"}', '{')
|
||
self.assertEqual(f'{"}"}', '}')
|
||
self.assertEqual(f'{3:{"}"}>10}', '}}}}}}}}}3')
|
||
self.assertEqual(f'{2:{"{"}>10}', '{{{{{{{{{2')
|
||
|
||
def test_if_conditional(self):
|
||
# There's special logic in compile.c to test if the
|
||
# conditional for an if (and while) are constants. Exercise
|
||
# that code.
|
||
|
||
def test_fstring(x, expected):
|
||
flag = 0
|
||
if f'{x}':
|
||
flag = 1
|
||
else:
|
||
flag = 2
|
||
self.assertEqual(flag, expected)
|
||
|
||
def test_concat_empty(x, expected):
|
||
flag = 0
|
||
if '' f'{x}':
|
||
flag = 1
|
||
else:
|
||
flag = 2
|
||
self.assertEqual(flag, expected)
|
||
|
||
def test_concat_non_empty(x, expected):
|
||
flag = 0
|
||
if ' ' f'{x}':
|
||
flag = 1
|
||
else:
|
||
flag = 2
|
||
self.assertEqual(flag, expected)
|
||
|
||
test_fstring('', 2)
|
||
test_fstring(' ', 1)
|
||
|
||
test_concat_empty('', 2)
|
||
test_concat_empty(' ', 1)
|
||
|
||
test_concat_non_empty('', 1)
|
||
test_concat_non_empty(' ', 1)
|
||
|
||
def test_empty_format_specifier(self):
|
||
x = 'test'
|
||
self.assertEqual(f'{x}', 'test')
|
||
self.assertEqual(f'{x:}', 'test')
|
||
self.assertEqual(f'{x!s:}', 'test')
|
||
self.assertEqual(f'{x!r:}', "'test'")
|
||
|
||
def test_str_format_differences(self):
|
||
d = {'a': 'string',
|
||
0: 'integer',
|
||
}
|
||
a = 0
|
||
self.assertEqual(f'{d[0]}', 'integer')
|
||
self.assertEqual(f'{d["a"]}', 'string')
|
||
self.assertEqual(f'{d[a]}', 'integer')
|
||
self.assertEqual('{d[a]}'.format(d=d), 'string')
|
||
self.assertEqual('{d[0]}'.format(d=d), 'integer')
|
||
|
||
def test_errors(self):
|
||
# see issue 26287
|
||
self.assertAllRaise(TypeError, 'unsupported',
|
||
[r"f'{(lambda: 0):x}'",
|
||
r"f'{(0,):x}'",
|
||
])
|
||
self.assertAllRaise(ValueError, 'Unknown format code',
|
||
[r"f'{1000:j}'",
|
||
r"f'{1000:j}'",
|
||
])
|
||
|
||
def test_filename_in_syntaxerror(self):
|
||
# see issue 38964
|
||
with temp_cwd() as cwd:
|
||
file_path = os.path.join(cwd, 't.py')
|
||
with open(file_path, 'w') as f:
|
||
f.write('f"{a b}"') # This generates a SyntaxError
|
||
_, _, stderr = assert_python_failure(file_path,
|
||
PYTHONIOENCODING='ascii')
|
||
self.assertIn(file_path.encode('ascii', 'backslashreplace'), stderr)
|
||
|
||
def test_loop(self):
|
||
for i in range(1000):
|
||
self.assertEqual(f'i:{i}', 'i:' + str(i))
|
||
|
||
def test_dict(self):
|
||
d = {'"': 'dquote',
|
||
"'": 'squote',
|
||
'foo': 'bar',
|
||
}
|
||
self.assertEqual(f'''{d["'"]}''', 'squote')
|
||
self.assertEqual(f"""{d['"']}""", 'dquote')
|
||
|
||
self.assertEqual(f'{d["foo"]}', 'bar')
|
||
self.assertEqual(f"{d['foo']}", 'bar')
|
||
|
||
def test_backslash_char(self):
|
||
# Check eval of a backslash followed by a control char.
|
||
# See bpo-30682: this used to raise an assert in pydebug mode.
|
||
self.assertEqual(eval('f"\\\n"'), '')
|
||
self.assertEqual(eval('f"\\\r"'), '')
|
||
|
||
def test_debug_conversion(self):
|
||
x = 'A string'
|
||
self.assertEqual(f'{x=}', 'x=' + repr(x))
|
||
self.assertEqual(f'{x =}', 'x =' + repr(x))
|
||
self.assertEqual(f'{x=!s}', 'x=' + str(x))
|
||
self.assertEqual(f'{x=!r}', 'x=' + repr(x))
|
||
self.assertEqual(f'{x=!a}', 'x=' + ascii(x))
|
||
|
||
x = 2.71828
|
||
self.assertEqual(f'{x=:.2f}', 'x=' + format(x, '.2f'))
|
||
self.assertEqual(f'{x=:}', 'x=' + format(x, ''))
|
||
self.assertEqual(f'{x=!r:^20}', 'x=' + format(repr(x), '^20'))
|
||
self.assertEqual(f'{x=!s:^20}', 'x=' + format(str(x), '^20'))
|
||
self.assertEqual(f'{x=!a:^20}', 'x=' + format(ascii(x), '^20'))
|
||
|
||
x = 9
|
||
self.assertEqual(f'{3*x+15=}', '3*x+15=42')
|
||
|
||
# There is code in ast.c that deals with non-ascii expression values. So,
|
||
# use a unicode identifier to trigger that.
|
||
tenπ = 31.4
|
||
self.assertEqual(f'{tenπ=:.2f}', 'tenπ=31.40')
|
||
|
||
# Also test with Unicode in non-identifiers.
|
||
self.assertEqual(f'{"Σ"=}', '"Σ"=\'Σ\'')
|
||
|
||
# Make sure nested fstrings still work.
|
||
self.assertEqual(f'{f"{3.1415=:.1f}":*^20}', '*****3.1415=3.1*****')
|
||
|
||
# Make sure text before and after an expression with = works
|
||
# correctly.
|
||
pi = 'π'
|
||
self.assertEqual(f'alpha α {pi=} ω omega', "alpha α pi='π' ω omega")
|
||
|
||
# Check multi-line expressions.
|
||
self.assertEqual(f'''{
|
||
3
|
||
=}''', '\n3\n=3')
|
||
|
||
# Since = is handled specially, make sure all existing uses of
|
||
# it still work.
|
||
|
||
self.assertEqual(f'{0==1}', 'False')
|
||
self.assertEqual(f'{0!=1}', 'True')
|
||
self.assertEqual(f'{0<=1}', 'True')
|
||
self.assertEqual(f'{0>=1}', 'False')
|
||
self.assertEqual(f'{(x:="5")}', '5')
|
||
self.assertEqual(x, '5')
|
||
self.assertEqual(f'{(x:=5)}', '5')
|
||
self.assertEqual(x, 5)
|
||
self.assertEqual(f'{"="}', '=')
|
||
|
||
x = 20
|
||
# This isn't an assignment expression, it's 'x', with a format
|
||
# spec of '=10'. See test_walrus: you need to use parens.
|
||
self.assertEqual(f'{x:=10}', ' 20')
|
||
|
||
# Test named function parameters, to make sure '=' parsing works
|
||
# there.
|
||
def f(a):
|
||
nonlocal x
|
||
oldx = x
|
||
x = a
|
||
return oldx
|
||
x = 0
|
||
self.assertEqual(f'{f(a="3=")}', '0')
|
||
self.assertEqual(x, '3=')
|
||
self.assertEqual(f'{f(a=4)}', '3=')
|
||
self.assertEqual(x, 4)
|
||
|
||
# Make sure __format__ is being called.
|
||
class C:
|
||
def __format__(self, s):
|
||
return f'FORMAT-{s}'
|
||
def __repr__(self):
|
||
return 'REPR'
|
||
|
||
self.assertEqual(f'{C()=}', 'C()=REPR')
|
||
self.assertEqual(f'{C()=!r}', 'C()=REPR')
|
||
self.assertEqual(f'{C()=:}', 'C()=FORMAT-')
|
||
self.assertEqual(f'{C()=: }', 'C()=FORMAT- ')
|
||
self.assertEqual(f'{C()=:x}', 'C()=FORMAT-x')
|
||
self.assertEqual(f'{C()=!r:*^20}', 'C()=********REPR********')
|
||
|
||
self.assertRaises(SyntaxError, eval, "f'{C=]'")
|
||
|
||
# Make sure leading and following text works.
|
||
x = 'foo'
|
||
self.assertEqual(f'X{x=}Y', 'Xx='+repr(x)+'Y')
|
||
|
||
# Make sure whitespace around the = works.
|
||
self.assertEqual(f'X{x =}Y', 'Xx ='+repr(x)+'Y')
|
||
self.assertEqual(f'X{x= }Y', 'Xx= '+repr(x)+'Y')
|
||
self.assertEqual(f'X{x = }Y', 'Xx = '+repr(x)+'Y')
|
||
|
||
# These next lines contains tabs. Backslash escapes don't
|
||
# work in f-strings.
|
||
# patchcheck doesn't like these tabs. So the only way to test
|
||
# this will be to dynamically created and exec the f-strings. But
|
||
# that's such a hassle I'll save it for another day. For now, convert
|
||
# the tabs to spaces just to shut up patchcheck.
|
||
#self.assertEqual(f'X{x =}Y', 'Xx\t='+repr(x)+'Y')
|
||
#self.assertEqual(f'X{x = }Y', 'Xx\t=\t'+repr(x)+'Y')
|
||
|
||
def test_walrus(self):
|
||
x = 20
|
||
# This isn't an assignment expression, it's 'x', with a format
|
||
# spec of '=10'.
|
||
self.assertEqual(f'{x:=10}', ' 20')
|
||
|
||
# This is an assignment expression, which requires parens.
|
||
self.assertEqual(f'{(x:=10)}', '10')
|
||
self.assertEqual(x, 10)
|
||
|
||
|
||
if __name__ == '__main__':
|
||
unittest.main()
|