# A program that implements a rudimentary phone catalog:
# - First asks the user to specify the number of entries in the catalog.
# - Second asks the user to enter enter names and phone numbers.
# - Third, 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 improved version of phone_numbers_1.py. The improvements are:
# - the program allows the user to enter "q" to exit the program.
# - if the name is not found, the program prints out a message stating that
#   the name was not found.

# get number of entries
N = input("enter number of entries: ")

# initialize lists that will store names and phone numbers
# convention: the programmer will make sure that numbers[i] stores
# the phone number for names[i].
names = []
numbers = []

# get from the user the names and phone numbers.
for i in range(0, N):
    name = raw_input("enter a name: ")
    number = raw_input("enter a phone number for " + name + ": ")

    names.append(name)
    numbers.append(number)

# 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 = raw_input("enter a name to look up: ")
    if name == "q":
        break
    name_found = False

    for i in range(0, N):
        if name == names[i]:
            print "the phone number of", name, "is", numbers[i]
            name_found = True

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