# Test various flavors of legal and illegal future statements import __future__ import ast import unittest from test import support from test.support import import_helper from textwrap import dedent import os import re import sys rx = re.compile(r'\((\S+).py, line (\d+)') def get_error_location(msg): mo = rx.search(str(msg)) return mo.group(1, 2) class FutureTest(unittest.TestCase): def check_syntax_error(self, err, basename, lineno, offset=1): self.assertIn('%s.py, line %d' % (basename, lineno), str(err)) self.assertEqual(os.path.basename(err.filename), basename + '.py') self.assertEqual(err.lineno, lineno) self.assertEqual(err.offset, offset) def test_future1(self): with import_helper.CleanImport('future_test1'): from test import future_test1 self.assertEqual(future_test1.result, 6) def test_future2(self): with import_helper.CleanImport('future_test2'): from test import future_test2 self.assertEqual(future_test2.result, 6) def test_future3(self): with import_helper.CleanImport('test_future3'): from test import test_future3 def test_badfuture3(self): with self.assertRaises(SyntaxError) as cm: from test import badsyntax_future3 self.check_syntax_error(cm.exception, "badsyntax_future3", 3) def test_badfuture4(self): with self.assertRaises(SyntaxError) as cm: from test import badsyntax_future4 self.check_syntax_error(cm.exception, "badsyntax_future4", 3) def test_badfuture5(self): with self.assertRaises(SyntaxError) as cm: from test import badsyntax_future5 self.check_syntax_error(cm.exception, "badsyntax_future5", 4) def test_badfuture6(self): with self.assertRaises(SyntaxError) as cm: from test import badsyntax_future6 self.check_syntax_error(cm.exception, "badsyntax_future6", 3) def test_badfuture7(self): with self.assertRaises(SyntaxError) as cm: from test import badsyntax_future7 self.check_syntax_error(cm.exception, "badsyntax_future7", 3, 53) def test_badfuture8(self): with self.assertRaises(SyntaxError) as cm: from test import badsyntax_future8 self.check_syntax_error(cm.exception, "badsyntax_future8", 3) def test_badfuture9(self): with self.assertRaises(SyntaxError) as cm: from test import badsyntax_future9 self.check_syntax_error(cm.exception, "badsyntax_future9", 3) def test_badfuture10(self): with self.assertRaises(SyntaxError) as cm: from test import badsyntax_future10 self.check_syntax_error(cm.exception, "badsyntax_future10", 3) def test_ensure_flags_dont_clash(self): # bpo-39562: test that future flags and compiler flags doesn't clash # obtain future flags (CO_FUTURE_***) from the __future__ module flags = { f"CO_FUTURE_{future.upper()}": getattr(__future__, future).compiler_flag for future in __future__.all_feature_names } # obtain some of the exported compiler flags (PyCF_***) from the ast module flags |= { flag: getattr(ast, flag) for flag in dir(ast) if flag.startswith("PyCF_") } self.assertCountEqual(set(flags.values()), flags.values()) def test_parserhack(self): # test that the parser.c::future_hack function works as expected # Note: although this test must pass, it's not testing the original # bug as of 2.6 since the with statement is not optional and # the parser hack disabled. If a new keyword is introduced in # 2.6, change this to refer to the new future import. try: exec("from __future__ import print_function; print 0") except SyntaxError: pass else: self.fail("syntax error didn't occur") try: exec("from __future__ import (print_function); print 0") except SyntaxError: pass else: self.fail("syntax error didn't occur") def test_multiple_features(self): with import_helper.CleanImport("test.test_future5"): from test import test_future5 def test_unicode_literals_exec(self): scope = {} exec("from __future__ import unicode_literals; x = ''", {}, scope) self.assertIsInstance(scope["x"], str) class AnnotationsFutureTestCase(unittest.TestCase): template = dedent( """ from __future__ import annotations def f() -> {ann}: ... def g(arg: {ann}) -> None: ... async def f2() -> {ann}: ... async def g2(arg: {ann}) -> None: ... var: {ann} var2: {ann} = None """ ) def getActual(self, annotation): scope = {} exec(self.template.format(ann=annotation), {}, scope) func_ret_ann = scope['f'].__annotations__['return'] func_arg_ann = scope['g'].__annotations__['arg'] async_func_ret_ann = scope['f2'].__annotations__['return'] async_func_arg_ann = scope['g2'].__annotations__['arg'] var_ann1 = scope['__annotations__']['var'] var_ann2 = scope['__annotations__']['var2'] self.assertEqual(func_ret_ann, func_arg_ann) self.assertEqual(func_ret_ann, async_func_ret_ann) self.assertEqual(func_ret_ann, async_func_arg_ann) self.assertEqual(func_ret_ann, var_ann1) self.assertEqual(func_ret_ann, var_ann2) return func_ret_ann def assertAnnotationEqual( self, annotation, expected=None, drop_parens=False, is_tuple=False, ): actual = self.getActual(annotation) if expected is None: expected = annotation if not is_tuple else annotation[1:-1] if drop_parens: self.assertNotEqual(actual, expected) actual = actual.replace("(", "").replace(")", "") self.assertEqual(actual, expected) def test_annotations(self): eq = self.assertAnnotationEqual eq('...') eq("'some_string'") eq("u'some_string'") eq("b'\\xa3'") eq('Name') eq('None') eq('True') eq('False') eq('1') eq('1.0') eq('1j') eq('True or False') eq('True or False or None') eq('True and False') eq('True and False and None') eq('Name1 and Name2 or Name3') eq('Name1 and (Name2 or Name3)') eq('Name1 or Name2 and Name3') eq('(Name1 or Name2) and Name3') eq('Name1 and Name2 or Name3 and Name4') eq('Name1 or Name2 and Name3 or Name4') eq('a + b + (c + d)') eq('a * b * (c * d)') eq('(a ** b) ** c ** d') eq('v1 << 2') eq('1 >> v2') eq('1 % finished') eq('1 + v2 - v3 * 4 ^ 5 ** v6 / 7 // 8') eq('not great') eq('not not great') eq('~great') eq('+value') eq('++value') eq('-1') eq('~int and not v1 ^ 123 + v2 | True') eq('a + (not b)') eq('lambda: None') eq('lambda arg: None') eq('lambda a=True: a') eq('lambda a, b, c=True: a') eq("lambda a, b, c=True, *, d=1 << v2, e='str': a") eq("lambda a, b, c=True, *vararg, d, e='str', **kwargs: a + b") eq("lambda a, /, b, c=True, *vararg, d, e='str', **kwargs: a + b") eq('lambda x, /: x') eq('lambda x=1, /: x') eq('lambda x, /, y: x + y') eq('lambda x=1, /, y=2: x + y') eq('lambda x, /, y=1: x + y') eq('lambda x, /, y=1, *, z=3: x + y + z') eq('lambda x=1, /, y=2, *, z=3: x + y + z') eq('lambda x=1, /, y=2, *, z: x + y + z') eq('lambda x=1, y=2, z=3, /, w=4, *, l, l2: x + y + z + w + l + l2') eq('lambda x=1, y=2, z=3, /, w=4, *, l, l2, **kwargs: x + y + z + w + l + l2') eq('lambda x, /, y=1, *, z: x + y + z') eq('lambda x: lambda y: x + y') eq('1 if True else 2') eq('str or None if int or True else str or bytes or None') eq('str or None if (1 if True else 2) else str or bytes or None') eq("0 if not x else 1 if x > 0 else -1") eq("(1 if x > 0 else -1) if x else 0") eq("{'2.7': dead, '3.7': long_live or die_hard}") eq("{'2.7': dead, '3.7': long_live or die_hard, **{'3.6': verygood}}") eq("{**a, **b, **c}") eq("{'2.7', '3.6', '3.7', '3.8', '3.9', '4.0' if gilectomy else '3.10'}") eq("{*a, *b, *c}") eq("({'a': 'b'}, True or False, +value, 'string', b'bytes') or None") eq("()") eq("(a,)") eq("(a, b)") eq("(a, b, c)") eq("(*a, *b, *c)") eq("[]") eq("[1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or A, 11 or B, 12 or C]") eq("[*a, *b, *c]") eq("{i for i in (1, 2, 3)}") eq("{i ** 2 for i in (1, 2, 3)}") eq("{i ** 2 for i, _ in ((1, 'a'), (2, 'b'), (3, 'c'))}") eq("{i ** 2 + j for i in (1, 2, 3) for j in (1, 2, 3)}") eq("[i for i in (1, 2, 3)]") eq("[i ** 2 for i in (1, 2, 3)]") eq("[i ** 2 for i, _ in ((1, 'a'), (2, 'b'), (3, 'c'))]") eq("[i ** 2 + j for i in (1, 2, 3) for j in (1, 2, 3)]") eq("(i for i in (1, 2, 3))") eq("(i ** 2 for i in (1, 2, 3))") eq("(i ** 2 for i, _ in ((1, 'a'), (2, 'b'), (3, 'c')))") eq("(i ** 2 + j for i in (1, 2, 3) for j in (1, 2, 3))") eq("{i: 0 for i in (1, 2, 3)}") eq("{i: j for i, j in ((1, 'a'), (2, 'b'), (3, 'c'))}") eq("[(x, y) for x, y in (a, b)]") eq("[(x,) for x, in (a,)]") eq("Python3 > Python2 > COBOL") eq("Life is Life") eq("call()") eq("call(arg)") eq("call(kwarg='hey')") eq("call(arg, kwarg='hey')") eq("call(arg, *args, another, kwarg='hey')") eq("call(arg, another, kwarg='hey', **kwargs, kwarg2='ho')") eq("lukasz.langa.pl") eq("call.me(maybe)") eq("1 .real") eq("1.0.real") eq("....__class__") eq("list[str]") eq("dict[str, int]") eq("set[str,]") eq("tuple[str, ...]") eq("tuple[(str, *types)]") eq("tuple[str, int, (str, int)]") eq("tuple[(*int, str, str, (str, int))]") eq("tuple[str, int, float, dict[str, int]]") eq("slice[0]") eq("slice[0:1]") eq("slice[0:1:2]") eq("slice[:]") eq("slice[:-1]") eq("slice[1:]") eq("slice[::-1]") eq("slice[:,]") eq("slice[1:2,]") eq("slice[1:2:3,]") eq("slice[1:2, 1]") eq("slice[1:2, 2, 3]") eq("slice[()]") eq("slice[a, b:c, d:e:f]") eq("slice[(x for x in a)]") eq('str or None if sys.version_info[0] > (3,) else str or bytes or None') eq("f'f-string without formatted values is just a string'") eq("f'{{NOT a formatted value}}'") eq("f'some f-string with {a} {few():.2f} {formatted.values!r}'") eq('''f"{f'{nested} inner'} outer"''') eq("f'space between opening braces: { {a for a in (1, 2, 3)}}'") eq("f'{(lambda x: x)}'") eq("f'{(None if a else lambda x: x)}'") eq("f'{x}'") eq("f'{x!r}'") eq("f'{x!a}'") eq('(yield from outside_of_generator)') eq('(yield)') eq('(yield a + b)') eq('await some.complicated[0].call(with_args=True or 1 is not 1)') eq('[x for x in (a if b else c)]') eq('[x for x in a if (b if c else d)]') eq('f(x for x in a)') eq('f(1, (x for x in a))') eq('f((x for x in a), 2)') eq('(((a)))', 'a') eq('(((a, b)))', '(a, b)') eq("(x := 10)") eq("f'{(x := 10):=10}'") eq("1 + 2 + 3") def test_fstring_debug_annotations(self): # f-strings with '=' don't round trip very well, so set the expected # result explicitely. self.assertAnnotationEqual("f'{x=!r}'", expected="f'x={x!r}'") self.assertAnnotationEqual("f'{x=:}'", expected="f'x={x:}'") self.assertAnnotationEqual("f'{x=:.2f}'", expected="f'x={x:.2f}'") self.assertAnnotationEqual("f'{x=!r}'", expected="f'x={x!r}'") self.assertAnnotationEqual("f'{x=!a}'", expected="f'x={x!a}'") self.assertAnnotationEqual("f'{x=!s:*^20}'", expected="f'x={x!s:*^20}'") def test_infinity_numbers(self): inf = "1e" + repr(sys.float_info.max_10_exp + 1) infj = f"{inf}j" self.assertAnnotationEqual("1e1000", expected=inf) self.assertAnnotationEqual("1e1000j", expected=infj) self.assertAnnotationEqual("-1e1000", expected=f"-{inf}") self.assertAnnotationEqual("3+1e1000j", expected=f"3 + {infj}") self.assertAnnotationEqual("(1e1000, 1e1000j)", expected=f"({inf}, {infj})") self.assertAnnotationEqual("'inf'") self.assertAnnotationEqual("('inf', 1e1000, 'infxxx', 1e1000j)", expected=f"('inf', {inf}, 'infxxx', {infj})") self.assertAnnotationEqual("(1e1000, (1e1000j,))", expected=f"({inf}, ({infj},))") if __name__ == "__main__": unittest.main()