#filter

Description: Filters data.

def filter(fn, iterable):
    '''
    Filters data

    :param fn: Callback function, returns True to keep the element, False to discard it
    :param iterable: The iterable to filter
    :return: A filtered iterable
    '''

Example:

numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]
print(filter(lambda x : x % 2 == 0, numbers))
print(list(filter(lambda x : x % 2 == 0, numbers)))
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