# 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 variation of phone_numbers_2.py, that behaves the same way.
# The difference is that here the information is stored in a single list
# of pairs, as opposed to a pair of lists.

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

# 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.
for i in range(0, N):
    name = raw_input("enter a name: ")
    number = raw_input("enter a phone number for " + name + ": ")

    catalog.append([name, 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 entry in catalog:
        if name == entry[0]:
            print "the phone number of", name, "is", entry[1]
            name_found = True

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