python 2.7 - input string only

Question

How do I ask the user to input the string only. If there isn't such a thing how do I set it so that if they enter anything else it would ask the user to re-enter.

This is what I have tried (it doesn't work):

name = raw_input("Enter name: ")
 if name != str(name):
     name = raw_input("Error, please re-enter : ")

Answer 1

while True:
    userInput = raw_input("Enter a string only")
    if type(userInput) not str:
        continue
    else:
        print "You entered a STR data type. Congratulations"
        break