''' Purpose: consider parameter passing nuance in Python
'''

# values that are passed into functions during invocation are copies!
# if you pass in strings, numbers, they will only pass in the copies of those values
def f( x, y ) :
    ''' Does ???
    '''

    # attempt to switch the values between x and y
    rmbr = x
    x    = y
    y    = rmbr

    return