Pylon loop

[ozchadl]

I am writing a program in Python 2.6 and need help with doing a loop.

the user input can only enter "a1", "a2", a3", "a4", or "a5"

any other input it should loop back

if the input was valid it should continue.
if the input was not valid it should get another input until it is valid


thanks for your help

[bvdet]

A while loop is used in the following example:

valid_input = ['a1', 'a2', 'a3', 'a4', 'a5']

while True:
    print "Valid input is %s" % (", ".join(valid_input))
    s = raw_input("Enter valid input")
    if s in valid_input:
        break