Python 2.7 Only numbers as input, the ValueError issue

Question

How do i stop python from giving me an ValueError everytime I put a letter in? Input must be a number! Using Python 2.7.3

TerryA · Accepted Answer · 2013-09-05 09:33:44Z

1

Instead of using input(), use raw_input(), which returns a string.

input() is equivalent to eval(raw_input()) in Python 2.7. Hence, if you input a letter (let's say 'a'), it will try look for a variable called 'a'. If there isn't one, a NameError is raised.

if you're working with numbers, then you can always call int() on the input received by using raw_input(). You could also use a try: except: structure to catch any ValueErrors incase the input is not a number.

answered Sep 5, 2013 at 9:33

TerryA

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