# Author:  James Tam
# Version: March 6, 2010

# Learning concept: pass by reference (passing a reference to a
# list and the address of the list is lost during the function 
# call).

# In this case the local reference starts by refering to the list in the main
# function. However the assignment statement now causes it to refer to another
# list. The original list in the main function remains unchanged.
def fun(list):
    list = [3,2,1]
    print(list)

def main():
    list = [1,2,3]
    print(list)
    fun(list)
    print(list)
                          
main()