I just created a "who's your daddy?" program--one of the challenges in the michael dawson book.
It was working well, and I tested all the different instructions, and then for some reason, it stopped working. Specifically, whenever I enter the name of a father, it tells me it doesn't exist, although it does, because when you list all the fathers, you can see it exists, and I set it up in the dictionary.
It may be that I've missed something. I know I saved this program so many times, maybe I changed something without realising it, although I've been through every line of code numerous times. I don't know how to use the IDLE debugger, which could be part of my problem. The help file doesn't seem to help.
Here's the code:
# This program lets the user enter the first and last name of a male
# and produces the name of his son. The user will also be able
# to add, replace, and delete son-father pairs.
father_son = {"Kirk Douglas" : "Michael Douglas",
"James Brolin" : "Josh Brolin",
"Marlon Brando" : "Christian Brando",
"George Best" : "Calum Best",
"David Beckham" : "Brooklyn Beckham",
"Bob Dylan" : "Jakob Dylan"}
choice = None
while choice != "0":
print \
"""
Welcome to Who's Your Daddy? A mini database of fathers and sons.
When entering names, please use both the first name and the last name.
0 - Exit
1 - List all Father-Son Pairs
2 - List all Fathers
3 - Look Up Father-Son Pairs
4 - Add a Father-Son Pair
5 - Delete a Father-Son Pair
6 - Replace the Son of a Father-Son Pair
7 - Replace a Father-Son Pair
"""
choice = raw_input("Choice: ")
print
# exit program
if choice == "0":
print "\nGoodbye."
# list all father-son pairs
elif choice == "1":
print "\nLIST OF ALL FATHER-SON PAIRS\n"
print father_son
# list all fathers
elif choice == "2":
print "LIST OF ALL FATHERS\n"
for father_son in father_son:
print father_son
# look up father-son pairs
elif choice == "3":
term = raw_input("Type in the name of the father of this pair: ")
if term in father_son:
definition = father_son[term]
print term, "is the father of", definition
else:
print "\nSorry,", term, "doesn't exist."
# add a father-son pair
elif choice == "4":
term = raw_input("Type in the name of the father you want to add: ")
if term not in father_son:
definition = raw_input("Type in the name of this person's son: ")
father_son[term] = definition
print "\nThank you. Your new father-son pair has been added."
print term, "is the father of", definition
else:
print term, "already exists in the database. Try updating the entry."
# delete a father-son pair
elif choice == "5":
term = raw_input("Type in the name of the father which corresponds \
to the father-son pair you want to delete: ")
if term in father_son:
definition = father_son[term]
del father_son[term]
print term, "and his son", definition, "have been removed from the database."
else:
print "\nI don't recognise this name. Try adding it as an
entry."
# replace the son of a father-son pair
elif choice == "6":
term = raw_input("Type in the name of the father whose son you want \
to replace: ")
if term in father_son:
definition = raw_input("Type in the name of this person's son: ")
father_son[term] = definition
print "\nThank you. Your change has been made.", term, "is now \
the father of",
definition
else:
print "\nSorry, that name doesn't exist."
# replace a father-son pair
elif choice == "7":
term = raw_input("Type in the name of the father which corresponds \
to the father-son pair you want to replace: ")
if term in father_son:
term = raw_input("Type in name of this 'replacement' father: ")
definition = raw_input("Type in the name of this person's son: ")
father_son[term] = definition
print "A new father-son pair has been added.", term, "is the
\
father of", definition
else:
print "\nSorry, but", choice, "isn't a valid choice."
raw_input("\n\nPress the enter key to exit")
_______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
