Returns all items of an iterable with the same maximum or minimum value

iterables.py

def find_minimums(iterable, func):
    """Returns all items of the iterable with the same minimum value"""
    minimum = None
    minimums = []
    for item in iterable:
        if minimum is None or func(item) < minimum:
            minimum = func(item)
            minimums = [item]
        elif func(item) == minimum:
            minimums.append(item)
    return minimums


def find_maximums(iterable, func):
    """Returns all items of the iterable with the same maximum value"""
    maximum = None
    maximums = []
    for item in iterable:
        if maximum is None or func(item) > maximum:
            maximum = func(item)
            maximums = [item]
        elif func(item) == maximum:
            maximums.append(item)
    return maximums