pygLatin.py

#!/usr/bin/env python2
# -*- coding: utf-8 -*-

pyg = 'ay'

while True:
    original = raw_input('Enter a word: \t')
    if len(original) > 0 and original.isalpha():
        word = original.lower()
        first = word[0]
        vowels = 'aeiou'
        if first in vowels:
            new_word = original + pyg
            print new_word
            break
        else: #The word is a consonant
            new_word = original[1:] + first + pyg
            print new_word
            break
    else:
        print 'You entered invalid input. Please try again'

PyGlatin Codecademy Project Slightly modified to run again if invalid input is detected