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Python Python Basics (2015) Letter Game App Even or Odd Loop

Posted by David Rosenman
David Rosenman
875 Points

I'm pretty sure my code is correct... not sure why it is saying it isn't working. The output seems correct.

import random def even_odd(num): # If % 2 is 0, the number is even. # Since 0 is falsey, we have to invert it with not. return not num % 2 start = 5 while start: test_number = random.randint(1,99) if even_odd(test_number): print("{} is even".format(test_number)) else: print("{} is odd".format(test_number)) start = start - 1

even.py 
import random
def even_odd(num):
    # If % 2 is 0, the number is even.
    # Since 0 is falsey, we have to invert it with not.
    return not num % 2
start = 5
while start:
    test_number = random.randint(1,99)
    if even_odd(test_number):
        print("{} is even".format(test_number)) 
    else: 
        print("{} is odd".format(test_number))
    start = start - 1

2 Answers

andren
andren
28,558 Points
andren
andren
28,558 Points

Your code is indeed completely correct. After a bit of experimenting I have discovered that the cause of the issue seems to be the variable name you choose for the random number to be stored in. I do not know why (and this is definitively a bug on Treehouse's side) but the challenge will not accept the solution with the variable named test_number but will accept it if you name the variable literally anything else.

This will work for example:

import random
def even_odd(num):
    # If % 2 is 0, the number is even.
    # Since 0 is falsey, we have to invert it with not.
    return not num % 2
start = 5
while start:
    randNum = random.randint(1,99)
    if even_odd(randNum):
        print("{} is even".format(randNum)) 
    else: 
        print("{} is odd".format(randNum))
    start = start - 1

But even a less descriptive name like the letter a is accepted, the only name not accepted is the one you happened to choose test_number.

The code checker for these challenges will sometimes create some variables for your code automatically as part of its verification process, it's possible that you accidentally ended up naming your variable something that the code checker was using itself and therefore messing up its code. I do not know for sure but it's clearly a bug either way.

Maybe a mod like Jennifer Nordell can take a look at this and see if she can get it fixed. But until then you can bypass the bug by simply changing the name of your variable.

Jennifer Nordell
seal-mask
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher
Jennifer Nordell
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

Hi there! I can confirm what @andren has experienced. If I simply rename your test_number to tes_number it passes. I'm inclined to agree with him on the theory that this is possibly a variable already use by the code used to run your code.

Nice catch, andren! And thank you for your help in the Community! :thumbsup:

Unfortunately, I'm not Treehouse staff and do not have any magical abilities like they do. However, I think in this case we might tag Kenneth Love.

But, in short, your code was just fine! :sparkles:

Kenneth Love
STAFF
Kenneth Love
Treehouse Guest Teacher
Kenneth Love
Kenneth Love
Treehouse Guest Teacher

Yep, you found a fun little bug!

I've logged it with the developers so it should be fixed soon.