''' Purpose: demonstrate optional parameters
'''

# So now we are considering optional parameters, where
# for given parameters defined in the function definition,
# we don't have to supply those if we say that they have
# default values filled in for them.
# In a normal function
# chang(
def chant( msg="Wahoo Wa", times=3 ) :
    
    for i in range( 0, times ) :
        print( msg )

if ( __name__ == '__main__' ) :
    # Modules typically contain solely function definitions.
    # However, now we're saying if we're in the module that
    # contains those functions, we can also just run the test
    # within the same module by identifying that
    # the __name__ for this Python program is '__main__'
    # meaning we can just run the program (testers) using
    # functions directly from this module since this module
    # is __main__.
    # Since we're in the module, __name__ is __main__
    # If we weren't, it would be like cheer (module name)

    chant() # Notice how we didn't supply msg and times

    print()

    chant( msg='UVA NCAA Basketball champs' ) # Now we said message
    # is going to be something else but the default value for
    # value of times is default 3 (we didn't need to fill it in)

    print()

    chant( times=5 ) # Our default message is still Wahoo Wa
    # but our times is 5

    print()

    chant( 'We are CS 1112', 1 ) # now we filled in both message and
    # times so those are the arguments we provide for those
    # parameters now

    # Optional parameters have to be the last ones in the definition
    # Sooo don't do def f(x = 2, y) do like f(x, y=2)