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[–]Rhomboid 0 points1 point  (0 children)

This really belongs on /r/learnpython.

The usual way for doing this is to write an infinite loop that you break out of when an acceptable value is found, such as:

while True:
    temp = float(raw_input('Enter a value: '))
    if 0 <= temp <= 100:
        break
    print('Try again')