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key_mappercomparerreturnc s. |pt tt ttt d fdd }|S )N)sourcer c s t | S )a Partially applied max_by operator.
Returns the elements in an observable sequence with the maximum
key value.
Examples:
>>> res = max_by(source)
Args:
source: The source observable sequence to.
Returns:
An observable sequence containing a list of zero or more
elements that have a maximum key value.
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