Can't compare input strings in Python 3.2

Question

I'm experiencing a very odd problem in Python. These two didn't seem to help:

Validating user input strings in Python and fastest way to compare strings in python

I've written the following small program, test.py:

import sys
while True:
    print("\n")
    print("Type exit to exit: ")

    inputvar = str(input())
    print("Input: "+inputvar)

    if inputvar == 'exit':
        print("Exiting!")
        sys.exit("\n\nProgram quit.")
    else:
        print("Still here")

The current version doesn't seem to quit with exit, 'exit' or "exit". Using input() instead of str(input()) doesn't seem to make a difference, and using is or in instead of == doesn't make a difference either.

I'm using Python 3.2 on Windows 7.

input() already returns a string, so str(input()) won't make any difference. is compares identity, not equality, so is a bad choice for string comparisons; == is correct. If you're saying that 'exit' != 'exit' in your code, you have a serious problem; are you sure you haven't introduced some whitepace? Try inputvar.strip() or print(repr(inputvar)) to see what's going on. — jonrsharpe
– jonrsharpe, Commented May 6, 2015 at 10:22
Try adding inputvar.strip() just in case there is trailing whitespace for some reason. — ilent2
– ilent2, Commented May 6, 2015 at 10:23
print(repr(inputvar)) gives 'exit\r', apparently a carriage return was added. It works with .strip() added! — Gray
– Gray, Commented May 6, 2015 at 10:27

cdarke · Accepted Answer · 2015-05-06 10:44:43Z

7

There was a bug in Python 3.2.0 where the trailing \r was not removed from input() : details here. I suggest you upgrade (it was fixed very rapidly in 3.2.1). If you can't then:

inputvar = input().rstrip()

edited May 6, 2015 at 10:44

answered May 6, 2015 at 10:35

cdarke

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Comments

Dadaso Zanzane · Accepted Answer · 2015-05-06 10:49:34Z

-3

input() return a string

so no need to use str(input())

or you can use

inputvar = input().strip()

edited May 6, 2015 at 10:49

answered May 6, 2015 at 10:36

Dadaso Zanzane

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