8000 gh-91621: Fix typing.get_type_hints for collections.abc.Callable by hauntsaninja · Pull Request #91656 · python/cpython · GitHub
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gh-91621: Fix typing.get_type_hints for collections.abc.Callable #91656

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Merged
merged 5 commits into from
May 2, 2022
Merged

gh-91621: Fix typing.get_type_hints for collections.abc.Callable #91656

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4dfc970
gh-91621: Fix typing.get_type_hints for collections.abc.Callable
hauntsaninja Apr 18, 2022
e93b8e4
Merge branch 'main' into calltyp
hauntsaninja Apr 18, 2022
e8c4401
📜🤖 Added by blurb_it.
blurb-it[bot] Apr 18, 2022
6fecdfa
more tests
hauntsaninja Apr 18, 2022
b45397f
add helper
hauntsaninja May 2, 2022
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6 changes: 6 additions & 0 deletions Lib/test/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4408,6 +4408,12 @@ def test_get_type_hints_typeddict(self):
'a': Annotated[Required[int], "a", "b", "c"]
})

def test_get_type_hints_collections_abc_callable(self):
# https://github.com/python/cpython/issues/91621
def f(x: collections.abc.Callable[[int], int]): ...

self.assertEqual(get_type_hints(f), {'x': collections.abc.Callable[[int], int]})


class GetUtilitiesTestCase(TestCase):
def test_get_origin(self):
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6 changes: 5 additions & 1 deletion Lib/typing.py
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Expand Up @@ -350,7 +350,11 @@ def _eval_type(t, globalns, localns, recursive_guard=frozenset()):
ForwardRef(arg) if isinstance(arg, str) else arg
for arg in t.__args__
)
t = t.__origin__[args]
if (t.__origin__ is collections.abc.Callable
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I know this code pattern appears once in Generic code and once here now. Should we just convert this into one function? Maybe _should_flatten_callable_args()? Seems abit tiresome to repeat this (and it's also confusing for people who haven't dealt with Callable's args before).

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(sorry, missed this comment)
I added a helper function for this

and not (len(args) == 2 and _is_param_expr(args[0]))):
t = t.__origin__[(args[:-1], args[-1])]
else:
t = t.__origin__[args]
ev_args = tuple(_eval_type(a, globalns, localns, recursive_guard) for a in t.__args__)
if ev_args == t.__args__:
return t
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2022-04-18-18-55-21.gh-issue-91621.ACNlda.rst
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@@ -0,0 +1 @@
Fix :func:`typing.get_type_hints` for :class:`collections.abc.Callable`. Patch by Shantanu Jain.
0