# File:    moWeKennel.py
# Author:  Dr. Gibson
# Date:    10/3/2016
# Section: N/A
# E-mail:  k.gibson@umbc.edu 
# Description:
#   This code is similar to what we worked on in class.
#
#   This file contains python code that simulates a few
#   list-based tasks that kennel assistants might perform.

def main():

    # initialize the list of kennel pens with the dogs they contain
    kennelPens = ["Alaskan Klee Kai", "Beagle", "Chow Chow", 
                  "Doberman", "English Bulldog"]

    # first assistant only needs info about what the kennels contains,
    # so we use a for loop that goes over the contents of our list
    print("All of the dogs in the kennel:")
    print("------------------------------")
    for k in kennelPens:
        print(k)

    # second assistant needs to know their pen numbers as well,
    # so we use a for loop that goes over the INDEXES of our list
    print() # print empty line
    print("Location of dogs in the kennel:")
    print("-------------------------------")
    for i in range(len(kennelPens)):
        print("The dog in pen number", i, "is a", kennelPens[i])

    # NOTE: range() goes on the outside, because len() will 
    #       give us an integer (in this case, 5) and range() can
    #       then use that to generate the list [0, 1, 2, 3, 4]
    #       which are the different indexes of kennelPens items

    # third assistant needs to be able to CHANGE the contents of 
    # kennelPens list, so we can't just iterate over the contents
    # instead, we must again use a for loop over the INDEXES
    print() # print empty line
    print("Dogs picked up, German Shepherds dropped off:")
    print("---------------------------------------------")
    for i in range(len(kennelPens)):
        originalDog = kennelPens[i]
        kennelPens[i] = "German Shepherd"  # overwrite the old contents
        print("The", originalDog, "was picked up from pen", i)

    # NOTE: iterating over the contents uses the loop variable to 
    #       copy each list element, meaning that any changes made
    #       to the loop variable don't carry over to the list itself

    # and finally, let's just check the list one last time; since 
    # we're not changing anything, iterating over the contents is fine
    print() # print empty line
    print("At the end of the day:")
    print("----------------------")
    for k in kennelPens:
        print(k)

main()