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bpo-46414: Add typing.reveal_type #30646

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Merged
merged 6 commits into from
Feb 2, 2022
Merged

bpo-46414: Add typing.reveal_type #30646

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a4d99ef
bpo-46414: Add typing.reveal_type
JelleZijlstra Jan 17, 2022
e24a8a2
Update Misc/NEWS.d/next/Library/2022-01-17-10-00-02.bpo-46414.Ld0b_y.rst
JelleZijlstra Jan 17, 2022
8f5f750
add example
JelleZijlstra Jan 17, 2022
742884a
test the stdout and make it nicer
JelleZijlstra Jan 22, 2022
e447293
write to stderr
JelleZijlstra Jan 23, 2022
b2bbe06
Update Doc/library/typing.rst
JelleZijlstra Jan 23, 2022
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test the stdout and make it nicer
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@JelleZijlstra
JelleZijlstra committed Jan 22, 2022
commit 742884a00706739773d77eedacee64d52c802bc1
6 changes: 4 additions & 2 deletions Lib/test/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@
import weakref
import types

from test.support import import_helper
from test.support import import_helper, captured_stdout
from test import mod_generics_cache
from test import _typed_dict_helper

Expand Down Expand Up @@ -5112,7 +5112,9 @@ def bar(self):
class RevealTypeTests(BaseTestCase):
def test_reveal_type(self):
obj = object()
self.assertIs(obj, reveal_type(obj))
with captured_stdout() as stdout:
self.assertIs(obj, reveal_type(obj))
self.assertEqual(stdout.getvalue(), "Runtime type is 'object'\n")


class AllTests(BaseTestCase):
Expand Down
2 changes: 1 addition & 1 deletion Lib/typing.py
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Expand Up @@ -2686,5 +2686,5 @@ def reveal_type(obj: T, /) -> T:
argument and returns it unchanged.

"""
print("Runtime type is", type(obj))
print(f"Runtime type is {type(obj).__name__!r}")
return obj