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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_pydoc.py
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@ -81,7 +81,7 @@ CLASSES
|\x20\x20
| NO_MEANING = 'eggs'
|\x20\x20
| __annotations__ = {'NO_MEANING': <class 'str'>}
| __annotations__ = {'NO_MEANING': 'str'}
\x20\x20\x20\x20
class C(builtins.object)
| Methods defined here:
@ -194,7 +194,7 @@ Data descriptors defined here:<br>
Data and other attributes defined here:<br>
<dl><dt><strong>NO_MEANING</strong> = 'eggs'</dl>
<dl><dt><strong>__annotations__</strong> = {'NO_MEANING': &lt;class 'str'&gt;}</dl>
<dl><dt><strong>__annotations__</strong> = {'NO_MEANING': 'str'}</dl>
</td></tr></table> <p>
<table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="section">