firestar5683
41 lines
1018 B
Python
41 lines
1018 B
Python
from typing import Callable, List, Optional, TypeVar
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from reactivex import Observable, typing
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from reactivex.internal.basic import default_sub_comparer
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from ._minby import extrema_by
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_T = TypeVar("_T")
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_TKey = TypeVar("_TKey")
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def max_by_(
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key_mapper: typing.Mapper[_T, _TKey],
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comparer: Optional[typing.SubComparer[_TKey]] = None,
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) -> Callable[[Observable[_T]], Observable[List[_T]]]:
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cmp = comparer or default_sub_comparer
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def max_by(source: Observable[_T]) -> Observable[List[_T]]:
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"""Partially applied max_by operator.
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Returns the elements in an observable sequence with the maximum
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key value.
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Examples:
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>>> res = max_by(source)
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Args:
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source: The source observable sequence to.
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Returns:
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An observable sequence containing a list of zero or more
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elements that have a maximum key value.
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"""
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return extrema_by(source, key_mapper, cmp)
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return max_by
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__all__ = ["max_by_"]
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