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Patch from @sfreilich: make itertools.ifilter predicate parameter Optional (#1257)

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From Samuel Freilich:
In Python 2, the predicate parameter in itertools.ifilter and
itertools.ifilterfalse can be None, indicating that true or false values
should be retained (functionally equivalent to passing "bool" as the
predicate). In Python 3, filter and itertools.filterfalse have
the same behavior.
This commit is contained in:
Matthias Kramm
2017-05-09 17:50:11 -07:00
committed by Jelle Zijlstra
parent d7dd9fb832
commit 8d8a34cb83
3 changed files with 5 additions and 4 deletions
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stdlib/3/itertools.pyi
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@@ -29,7 +29,7 @@ class chain(Iterator[_T], Generic[_T]):
def compress(data: Iterable[_T], selectors: Iterable[Any]) -> Iterator[_T]: ...
def dropwhile(predicate: Callable[[_T], Any],
iterable: Iterable[_T]) -> Iterator[_T]: ...
def filterfalse(predicate: Callable[[_T], Any],
def filterfalse(predicate: Optional[Callable[[_T], Any]],
iterable: Iterable[_T]) -> Iterator[_T]: ...
@overload