"""
 example.py

 ... in class example of doctests.
"""


def triple(x):
    """ Return 3 times x 
        >>> triple(20)
        60
        >>> triple('hey')
        'heyheyhey'
    """
    return 3 * x

def main():
    value = input("What is the value? ")
    print("You said ", value, "; triple that is ", triple(value))
    print(triple('nana'), " batman!")

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