match_inputs_without_numbers.py

import re

while True:
    input_str = raw_input("What's your name? ") #reads user input 
    if ( re.match('[0-9]+', input_str) ):     # while the input doesn't match the pattern "one or more numbers in the string"
        print "Your name must NOT include numbers." #error out of the program
    else:
        break

print "if you see this, the entered name fullfilled the logical condition"