all_equal.py

def all_equal(iterable):
    """
    Check if all items are equal to each other.
    >>> all_equal([1, 1, 1])
    True
    >>> all_equal([1, 2, 1])
    False

    Args:
        iterable (iterable): a series of items to be checked
    """
    return len(set(iterable)) <= 1

if __name__ == '__main__':
    import doctest
    doctest.testmod()