Fix: allow instantiating type[None] and type(None)#21397
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tjhub1983 wants to merge 3 commits intopython:masterfrom
Open
Fix: allow instantiating type[None] and type(None)#21397tjhub1983 wants to merge 3 commits intopython:masterfrom
tjhub1983 wants to merge 3 commits intopython:masterfrom
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Python 3 allows calling NoneType() and type(None)():
>>> NoneType()
None
>>> type(None)()
None
But mypy raised an "unsupported_type_type" error in analyze_type_type_callee
when encountering a Type[None] callee. Fixed by adding isinstance(item, NoneType)
branch that returns a zero-argument CallableType returning NoneType.
Fixes python#19660.
for more information, see https://pre-commit.ci
`output` in Options defaults to None (meaning unset). The config parser skips options when getattr(template, key, None) returns None, so `output = json` in mypy.ini was silently ignored. Fixed by adding `"output": str` to both ini_config_types and toml_config_types, so the option is recognized and properly set. Fixes python#21376.
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Summary
Python 3 allows calling
NoneType()andtype(None)():But mypy raised an
Unsupported type type "NoneType"error when analyzing these callees.Fix
In
analyze_type_type_callee()(mypy/checkexpr.py), added anisinstance(item, NoneType)branch that returns a zero-argumentCallableTypereturningNoneType. This allows bothNoneType()andtype(None)()to type-check correctly.Fixes #19660.