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bpo-38605: Make 'from __future__ import annotations' the default (GH-20434)

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The hard part was making all the tests pass; there are some subtle issues here, because apparently the future import wasn't tested very thoroughly in previous Python versions.

For example, `inspect.signature()` returned type objects normally (except for forward references), but strings with the future import. We changed it to try and return type objects by calling `typing.get_type_hints()`, but fall back on returning strings if that function fails (which it may do if there are future references in the annotations that require passing in a specific namespace to resolve).
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Batuhan Taskaya 2020-10-06 23:03:02 +03:00 • committed by GitHub
parent bef7d299eb
commit 044a1048ca
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27 changed files with 403 additions and 299 deletions
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Lib/test/test_opcodes.py
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@ -39,7 +39,7 @@ class OpcodeTest(unittest.TestCase):
def test_use_existing_annotations(self):
ns = {'__annotations__': {1: 2}}
exec('x: int', ns)
self.assertEqual(ns['__annotations__'], {'x': int, 1: 2})
self.assertEqual(ns['__annotations__'], {'x': 'int', 1: 2})
def test_do_not_recreate_annotations(self):
# Don't rely on the existence of the '__annotations__' global.