"""
Module lect13_6
Example of a self-testing module (when run from command line)
    modified from "Learning Python", Lutz and Ascher, O'Reilly,
    pp. 173-174

adapted by: Sharon M. Tuttle
last modified: 11-19-05
"""

spam = 40

def square(val):
    """
    return the square of the passed value <val>
    """
    return val ** 2

if __name__ == "__main__":
    print "Testing square: true's mean passed, false's mean failed"
    print square(4) == 16
    print square(7) == 49