749 lines
27 KiB
Python
749 lines
27 KiB
Python
import ast
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import types
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import decimal
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import unittest
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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_literal_eval(self):
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# With no expressions, an f-string is okay.
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self.assertEqual(ast.literal_eval("f'x'"), 'x')
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self.assertEqual(ast.literal_eval("f'x' 'y'"), 'xy')
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# But this should raise an error.
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with self.assertRaisesRegex(ValueError, 'malformed node or string'):
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ast.literal_eval("f'x{3}'")
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# As should this, which uses a different ast node
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with self.assertRaisesRegex(ValueError, 'malformed node or string'):
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ast.literal_eval("f'{3}'")
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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_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, 'f-string: mismatched',
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["f'{((}'",
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])
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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')
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self.assertEqual(f'a{{b}}', 'a{b}')
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self.assertEqual(f'a{{}}c', 'a{}c')
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self.assertEqual(f'{{b}}c', '{b}c')
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self.assertEqual(f'a{{b}}c', 'a{b}c')
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self.assertEqual(f'{{{10}', '{10')
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self.assertEqual(f'}}{10}', '}10')
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self.assertEqual(f'}}{{{10}', '}{10')
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self.assertEqual(f'}}a{{{10}', '}a{10')
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self.assertEqual(f'{10}{{', '10{')
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self.assertEqual(f'{10}}}', '10}')
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self.assertEqual(f'{10}}}{{', '10}{')
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self.assertEqual(f'{10}}}a{{' '}', '10}a{}')
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# Inside of strings, don't interpret doubled brackets.
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self.assertEqual(f'{"{{}}"}', '{{}}')
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self.assertAllRaise(TypeError, 'unhashable type',
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["f'{ {{}} }'", # dict in a set
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])
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def test_compile_time_concat(self):
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x = 'def'
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self.assertEqual('abc' f'## {x}ghi', 'abc## defghi')
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self.assertEqual('abc' f'{x}' 'ghi', 'abcdefghi')
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self.assertEqual('abc' f'{x}' 'gh' f'i{x:4}', 'abcdefghidef ')
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self.assertEqual('{x}' f'{x}', '{x}def')
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self.assertEqual('{x' f'{x}', '{xdef')
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self.assertEqual('{x}' f'{x}', '{x}def')
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self.assertEqual('{{x}}' f'{x}', '{{x}}def')
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self.assertEqual('{{x' f'{x}', '{{xdef')
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self.assertEqual('x}}' f'{x}', 'x}}def')
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self.assertEqual(f'{x}' 'x}}', 'defx}}')
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self.assertEqual(f'{x}' '', 'def')
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self.assertEqual('' f'{x}' '', 'def')
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self.assertEqual('' f'{x}', 'def')
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self.assertEqual(f'{x}' '2', 'def2')
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self.assertEqual('1' f'{x}' '2', '1def2')
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self.assertEqual('1' f'{x}', '1def')
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self.assertEqual(f'{x}' f'-{x}', 'def-def')
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self.assertEqual('' f'', '')
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self.assertEqual('' f'' '', '')
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self.assertEqual('' f'' '' f'', '')
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self.assertEqual(f'', '')
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self.assertEqual(f'' '', '')
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self.assertEqual(f'' '' f'', '')
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self.assertEqual(f'' '' f'' '', '')
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self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
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["f'{3' f'}'", # can't concat to get a valid f-string
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])
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def test_comments(self):
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# These aren't comments, since they're in strings.
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d = {'#': 'hash'}
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self.assertEqual(f'{"#"}', '#')
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self.assertEqual(f'{d["#"]}', 'hash')
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self.assertAllRaise(SyntaxError, "f-string expression part cannot include '#'",
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["f'{1#}'", # error because the expression becomes "(1#)"
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"f'{3(#)}'",
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"f'{#}'",
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"f'{)#}'", # When wrapped in parens, this becomes
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# '()#)'. Make sure that doesn't compile.
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])
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def test_many_expressions(self):
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# Create a string with many expressions in it. Note that
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# because we have a space in here as a literal, we're actually
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# going to use twice as many ast nodes: one for each literal
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# plus one for each expression.
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def build_fstr(n, extra=''):
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return "f'" + ('{x} ' * n) + extra + "'"
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x = 'X'
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width = 1
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# Test around 256.
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for i in range(250, 260):
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self.assertEqual(eval(build_fstr(i)), (x+' ')*i)
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# Test concatenating 2 largs fstrings.
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self.assertEqual(eval(build_fstr(255)*256), (x+' ')*(255*256))
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s = build_fstr(253, '{x:{width}} ')
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self.assertEqual(eval(s), (x+' ')*254)
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# Test lots of expressions and constants, concatenated.
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s = "f'{1}' 'x' 'y'" * 1024
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self.assertEqual(eval(s), '1xy' * 1024)
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def test_format_specifier_expressions(self):
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width = 10
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precision = 4
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value = decimal.Decimal('12.34567')
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self.assertEqual(f'result: {value:{width}.{precision}}', 'result: 12.35')
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self.assertEqual(f'result: {value:{width!r}.{precision}}', 'result: 12.35')
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self.assertEqual(f'result: {value:{width:0}.{precision:1}}', 'result: 12.35')
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self.assertEqual(f'result: {value:{1}{0:0}.{precision:1}}', 'result: 12.35')
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self.assertEqual(f'result: {value:{ 1}{ 0:0}.{ precision:1}}', 'result: 12.35')
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self.assertEqual(f'{10:#{1}0x}', ' 0xa')
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self.assertEqual(f'{10:{"#"}1{0}{"x"}}', ' 0xa')
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self.assertEqual(f'{-10:-{"#"}1{0}x}', ' -0xa')
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self.assertEqual(f'{-10:{"-"}#{1}0{"x"}}', ' -0xa')
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self.assertEqual(f'{10:#{3 != {4:5} and width}x}', ' 0xa')
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self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
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["""f'{"s"!r{":10"}}'""",
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# This looks like a nested format spec.
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])
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self.assertAllRaise(SyntaxError, "invalid syntax",
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[# Invalid syntax inside a nested spec.
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"f'{4:{/5}}'",
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])
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self.assertAllRaise(SyntaxError, "f-string: expressions nested too deeply",
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[# Can't nest format specifiers.
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"f'result: {value:{width:{0}}.{precision:1}}'",
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])
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self.assertAllRaise(SyntaxError, 'f-string: invalid conversion character',
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[# No expansion inside conversion or for
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# the : or ! itself.
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"""f'{"s"!{"r"}}'""",
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])
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def test_side_effect_order(self):
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class X:
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def __init__(self):
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self.i = 0
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def __format__(self, spec):
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self.i += 1
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return str(self.i)
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x = X()
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self.assertEqual(f'{x} {x}', '1 2')
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def test_missing_expression(self):
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self.assertAllRaise(SyntaxError, 'f-string: empty expression not allowed',
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["f'{}'",
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"f'{ }'"
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"f' {} '",
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"f'{!r}'",
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"f'{ !r}'",
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"f'{10:{ }}'",
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"f' { } '",
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# Catch the empty expression before the
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# invalid conversion.
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"f'{!x}'",
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"f'{ !xr}'",
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"f'{!x:}'",
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"f'{!x:a}'",
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"f'{ !xr:}'",
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"f'{ !xr:a}'",
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"f'{!}'",
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"f'{:}'",
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# We find the empty expression before the
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# missing closing brace.
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"f'{!'",
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"f'{!s:'",
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"f'{:'",
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"f'{:x'",
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])
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def test_parens_in_expressions(self):
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self.assertEqual(f'{3,}', '(3,)')
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# Add these because when an expression is evaluated, parens
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# are added around it. But we shouldn't go from an invalid
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# expression to a valid one. The added parens are just
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# supposed to allow whitespace (including newlines).
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self.assertAllRaise(SyntaxError, 'invalid syntax',
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["f'{,}'",
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"f'{,}'", # this is (,), which is an error
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])
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self.assertAllRaise(SyntaxError, "f-string: expecting '}'",
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["f'{3)+(4}'",
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])
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self.assertAllRaise(SyntaxError, 'EOL while scanning string literal',
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["f'{\n}'",
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])
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def test_backslashes_in_string_part(self):
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self.assertEqual(f'\t', '\t')
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self.assertEqual(r'\t', '\\t')
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self.assertEqual(rf'\t', '\\t')
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self.assertEqual(f'{2}\t', '2\t')
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self.assertEqual(f'{2}\t{3}', '2\t3')
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self.assertEqual(f'\t{3}', '\t3')
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self.assertEqual(f'\u0394', '\u0394')
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self.assertEqual(r'\u0394', '\\u0394')
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self.assertEqual(rf'\u0394', '\\u0394')
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self.assertEqual(f'{2}\u0394', '2\u0394')
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self.assertEqual(f'{2}\u0394{3}', '2\u03943')
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self.assertEqual(f'\u0394{3}', '\u03943')
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self.assertEqual(f'\U00000394', '\u0394')
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self.assertEqual(r'\U00000394', '\\U00000394')
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self.assertEqual(rf'\U00000394', '\\U00000394')
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self.assertEqual(f'{2}\U00000394', '2\u0394')
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self.assertEqual(f'{2}\U00000394{3}', '2\u03943')
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self.assertEqual(f'\U00000394{3}', '\u03943')
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self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}', '\u0394')
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self.assertEqual(f'{2}\N{GREEK CAPITAL LETTER DELTA}', '2\u0394')
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self.assertEqual(f'{2}\N{GREEK CAPITAL LETTER DELTA}{3}', '2\u03943')
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self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}{3}', '\u03943')
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self.assertEqual(f'2\N{GREEK CAPITAL LETTER DELTA}', '2\u0394')
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self.assertEqual(f'2\N{GREEK CAPITAL LETTER DELTA}3', '2\u03943')
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self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}3', '\u03943')
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self.assertEqual(f'\x20', ' ')
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self.assertEqual(r'\x20', '\\x20')
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self.assertEqual(rf'\x20', '\\x20')
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self.assertEqual(f'{2}\x20', '2 ')
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self.assertEqual(f'{2}\x20{3}', '2 3')
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self.assertEqual(f'\x20{3}', ' 3')
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self.assertEqual(f'2\x20', '2 ')
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self.assertEqual(f'2\x203', '2 3')
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self.assertEqual(f'\x203', ' 3')
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def test_misformed_unicode_character_name(self):
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# These test are needed because unicode names are parsed
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# differently inside f-strings.
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self.assertAllRaise(SyntaxError, r"\(unicode error\) 'unicodeescape' codec can't decode bytes in position .*: malformed \\N character escape",
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[r"f'\N'",
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r"f'\N{'",
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r"f'\N{GREEK CAPITAL LETTER DELTA'",
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# Here are the non-f-string versions,
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# which should give the same errors.
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r"'\N'",
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r"'\N{'",
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r"'\N{GREEK CAPITAL LETTER DELTA'",
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])
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def test_no_backslashes_in_expression_part(self):
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self.assertAllRaise(SyntaxError, 'f-string expression part cannot include a backslash',
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[r"f'{\'a\'}'",
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r"f'{\t3}'",
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r"f'{\}'",
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r"rf'{\'a\'}'",
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r"rf'{\t3}'",
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r"rf'{\}'",
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r"""rf'{"\N{LEFT CURLY BRACKET}"}'""",
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])
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def test_no_escapes_for_braces(self):
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# \x7b is '{'. Make sure it doesn't start an expression.
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self.assertEqual(f'\x7b2}}', '{2}')
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self.assertEqual(f'\x7b2', '{2')
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self.assertEqual(f'\u007b2', '{2')
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self.assertEqual(f'\N{LEFT CURLY BRACKET}2\N{RIGHT CURLY BRACKET}', '{2}')
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def test_newlines_in_expressions(self):
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self.assertEqual(f'{0}', '0')
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self.assertEqual(rf'''{3+
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4}''', '7')
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def test_lambda(self):
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x = 5
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self.assertEqual(f'{(lambda y:x*y)("8")!r}', "'88888'")
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self.assertEqual(f'{(lambda y:x*y)("8")!r:10}', "'88888' ")
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self.assertEqual(f'{(lambda y:x*y)("8"):10}', "88888 ")
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# lambda doesn't work without parens, because the colon
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# makes the parser think it's a format_spec
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self.assertAllRaise(SyntaxError, 'unexpected EOF while parsing',
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["f'{lambda x:x}'",
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])
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def test_yield(self):
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# Not terribly useful, but make sure the yield turns
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# a function into a generator
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def fn(y):
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f'y:{yield y*2}'
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g = fn(4)
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self.assertEqual(next(g), 8)
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def test_yield_send(self):
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def fn(x):
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yield f'x:{yield (lambda i: x * i)}'
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g = fn(10)
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the_lambda = next(g)
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self.assertEqual(the_lambda(4), 40)
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self.assertEqual(g.send('string'), 'x:string')
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def test_expressions_with_triple_quoted_strings(self):
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self.assertEqual(f"{'''x'''}", 'x')
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self.assertEqual(f"{'''eric's'''}", "eric's")
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# Test concatenation within an expression
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self.assertEqual(f'{"x" """eric"s""" "y"}', 'xeric"sy')
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self.assertEqual(f'{"x" """eric"s"""}', 'xeric"s')
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self.assertEqual(f'{"""eric"s""" "y"}', 'eric"sy')
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self.assertEqual(f'{"""x""" """eric"s""" "y"}', 'xeric"sy')
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self.assertEqual(f'{"""x""" """eric"s""" """y"""}', 'xeric"sy')
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self.assertEqual(f'{r"""x""" """eric"s""" """y"""}', 'xeric"sy')
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def test_multiple_vars(self):
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x = 98
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y = 'abc'
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self.assertEqual(f'{x}{y}', '98abc')
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self.assertEqual(f'X{x}{y}', 'X98abc')
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self.assertEqual(f'{x}X{y}', '98Xabc')
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self.assertEqual(f'{x}{y}X', '98abcX')
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self.assertEqual(f'X{x}Y{y}', 'X98Yabc')
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self.assertEqual(f'X{x}{y}Y', 'X98abcY')
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self.assertEqual(f'{x}X{y}Y', '98XabcY')
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self.assertEqual(f'X{x}Y{y}Z', 'X98YabcZ')
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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):
|
|
self.assertAllRaise(SyntaxError, 'unexpected EOF while parsing',
|
|
["fu''",
|
|
"uf''",
|
|
"Fu''",
|
|
"fU''",
|
|
"Uf''",
|
|
"uF''",
|
|
"ufr''",
|
|
"urf''",
|
|
"fur''",
|
|
"fru''",
|
|
"rfu''",
|
|
"ruf''",
|
|
"FUR''",
|
|
"Fur''",
|
|
"fb''",
|
|
"fB''",
|
|
"Fb''",
|
|
"FB''",
|
|
"bf''",
|
|
"bF''",
|
|
"Bf''",
|
|
"BF''",
|
|
])
|
|
|
|
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_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'",
|
|
|
|
# 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_invalid_expressions(self):
|
|
self.assertAllRaise(SyntaxError, 'invalid syntax',
|
|
[r"f'{a[4)}'",
|
|
r"f'{a(4]}'",
|
|
])
|
|
|
|
def test_errors(self):
|
|
# see issue 26287
|
|
self.assertAllRaise(TypeError, 'non-empty',
|
|
[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_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')
|
|
|
|
if __name__ == '__main__':
|
|
unittest.main()
|