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Loosen some types to avoid pain in real-life situations (#4870)

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In this diff:
* Loosen `set.__[i]sub__()` to allow typical use cases (that work at runtime). Namely, allow removing `unicode` from a set of `str`, and allow removing optional values from non-optional sets.
* Avoid using union return types in `cryptography` deserialization functions.
* Tune `SupportsItems` so that `dict` implements it on Python 2.

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>
This commit is contained in:
Ivan Levkivskyi
2020-12-29 18:31:14 +00:00
committed by GitHub
parent 1ae3158174
commit fb753c4226
5 changed files with 29 additions and 13 deletions
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6
stdlib/2and3/_typeshed/__init__.pyi
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@@ -34,7 +34,11 @@ SupportsLessThanT = TypeVar("SupportsLessThanT", bound=SupportsLessThan) # noqa
# Mapping-like protocols
class SupportsItems(Protocol[_KT_co, _VT_co]):
def items(self) -> AbstractSet[Tuple[_KT_co, _VT_co]]: ...
if sys.version_info >= (3,):
def items(self) -> AbstractSet[Tuple[_KT_co, _VT_co]]: ...
else:
# We want dictionaries to support this on Python 2.
def items(self) -> Iterable[Tuple[_KT_co, _VT_co]]: ...
class SupportsKeysAndGetItem(Protocol[_KT, _VT_co]):
def keys(self) -> Iterable[_KT]: ...