# A program that implements a rudimentary phone catalog:
# - Asks the user to enter enter names and phone numbers.
# - Enters in a loop where the user enters a name and the
#   program looks up and prints out the corresponding phone number.

# This is an variation of phone_numbers_1.py, that behaves mostly the same way.
# One difference is that here the information is stored in a single list
# of pairs, as opposed to a pair of lists. Another difference is that
# this program prints a message when the name is not found in the catalog.



# initialize the list will store names and phone numbers
# convention: catalog[i] will store a list of two elements: position
# 0 will store the name, and position 1 will store the phone number.
catalog = []

# get from the user the names and phone numbers.
while True:
    name = input("enter a name: ")
    if (name == "q") or (name == "quit"):
        break
    
    number = input("enter a phone number for " + name + ": ")
    catalog.append([name, number])

print()

# now, get in a loop where the user enters a name, and the computer
# looks up and prints out the corresponding phone number.
while True:
    name = input("enter a name to look up: ")
    if (name == "q") or (name == "quit"):
        break
    name_found = False

    for entry in catalog:
        if name == entry[0]:
            print("the phone number of", name, "is", entry[1], "\n")
            name_found = True

        if (name_found == False):
            print("Name ", name, "is not in this catalog.\n")