ISBN

def isISBN(code):

    """
    Returns True is the argument is a string that contains a valid ISBN-10 code,
    False otherwise.

    >>> isISBN('9971502100')
    True
    >>> isISBN('9971502108')
    False
    >>> isISBN('53WKEFF2C')
    False
    >>> isISBN(4378580136)
    False
    """

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

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