[Tutor] Suggestions for while loop

[David]

Hi, I am going through Wesley Chun's book and this is Exercise 8-11;
Write a program to ask the user to input a list of names, format "Last 
Name" "comma" "First Name". Write a function that manages the input so 
that when/if the user types in the names in the wrong format the error 
is corrected, and keep track of the number of errors. When done sort the 
list.

Questions;

This;
answers = raw_input('Enter Name: ')
index = answers.find(',')

Does not seem to be a very good to me, how could I check for a comma 
between two words?

And This;
try:
     total_names = int(raw_input('Enter Total Number of Names: '))
except ValueError:
     print 'You must enter a number!'
     total_names = int(raw_input('Enter Total Number of Names: '))

Does not handle the second input for exceptions.

thanks,
-david


#!/usr/bin/python
import string

names = []

def get_names():
     wrong_format = 0
     count = 0
     try:
         total_names = int(raw_input('Enter Total Number of Names: '))
     except ValueError:
         print 'You must enter a number!'
         total_names = int(raw_input('Enter Total Number of Names: '))

     while count < total_names:
         print 'Format: LastName, First Name'
         answers = raw_input('Enter Name: ')
         index = answers.find(',')
         answers = answers.title()
         index = answers.find(',')
         if index != -1:
             names.append(answers)
             count += 1
         else:
             wrong_format += 1
             print '\nWrong Format!!!'
             if wrong_format > 1:
                 print 'That is %i Fixing Format ...' % wrong_format
             else:
                 print 'You have done this %i times, Fixing Format ...' 
% wrong_format
                 print 'Done, continue:\n'
                 answers = answers.split()
                 answers = string.join(answers, ', ')
                 names.append(answers)
                 count += 1

def show_names():
     print 'Your Names Are: \n'
     for i in sorted(names):
         print i

def main():
     get_names()
     if names:
         show_names()

if __name__ == "__main__":
     main()

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