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[3.13] gh-125331: Allow the parser to activate future imports on the fly (GH-125482) (#131062)

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gh-125331: Allow the parser to activate future imports on the fly (GH-125482)
(cherry picked from commit 3bd3e09588)

Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>
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Miss Islington (bot) 2025-03-10 23:20:38 +01:00 • committed by GitHub
parent 977af3a6a2
commit ebd2ed7ad8
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6 changed files with 50 additions and 2 deletions
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26
Lib/test/test_flufl.py
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@ -34,6 +34,32 @@ class FLUFLTests(unittest.TestCase):
# parser reports the start of the token
self.assertEqual(cm.exception.offset, 3)
def test_barry_as_bdfl_look_ma_with_no_compiler_flags(self):
# Check that the future import is handled by the parser
# even if the compiler flags are not passed.
code = "from __future__ import barry_as_FLUFL;2 {0} 3"
compile(code.format('<>'), '<BDFL test>', 'exec')
with self.assertRaises(SyntaxError) as cm:
compile(code.format('!='), '<FLUFL test>', 'exec')
self.assertRegex(str(cm.exception), "with Barry as BDFL, use '<>' instead of '!='")
self.assertIn('2 != 3', cm.exception.text)
self.assertEqual(cm.exception.filename, '<FLUFL test>')
self.assertEqual(cm.exception.lineno, 1)
self.assertEqual(cm.exception.offset, len(code) - 4)
def test_barry_as_bdfl_relative_import(self):
code = "from .__future__ import barry_as_FLUFL;2 {0} 3"
compile(code.format('!='), '<FLUFL test>', 'exec')
with self.assertRaises(SyntaxError) as cm:
compile(code.format('<>'), '<BDFL test>', 'exec')
self.assertRegex(str(cm.exception), "<BDFL test>")
self.assertIn('2 <> 3', cm.exception.text)
self.assertEqual(cm.exception.filename, '<BDFL test>')
self.assertEqual(cm.exception.lineno, 1)
self.assertEqual(cm.exception.offset, len(code) - 4)
if __name__ == '__main__':
unittest.main()