Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

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

Smith Thapa
Smith Thapa
7,023 Points
Posted by Smith Thapa
Smith Thapa
7,023 Points

How does this function even_odd(num) works?

return not num%2 ...what do you mean ?

even.py 
import random

start=5
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

while start==True :
    number= random.randint(1,99)
    if

3 Answers

jcorum
jcorum
71,830 Points

Sorry, yes, I misunderstood. 

return not num % 2

The remainder operator, %, returns the remainder of dividing the value of num by 2.

For example, if num were 23, then 23 % 2 is 1, which is truthy..

If num were 24, then num % 2 will be 0, which is falsey.

Because the function needs to return truthy when num is even, and falsey when num is odd, it adds not to the expression, to reverse what is returned: falsey when num is odd, truthy when num is even.

It would have been better coding, more self-documenting, if the function's name were is_even() rather than even_odd()!

Hope this helps!

Smith Thapa
Smith Thapa
7,023 Points
Smith Thapa
Smith Thapa
7,023 Points

It definitely helps ! Thank you.

Cindy Lea
PLUS
Cindy Lea
Courses Plus Student 6,497 Points
Cindy Lea
Cindy Lea
Courses Plus Student 6,497 Points

Well first the % function isthe remainder function. If there is a remainder it is true, otherwise its false. So by saying not in front it means return the opposite of what the equation result is.

jcorum
jcorum
71,830 Points
jcorum
jcorum
71,830 Points

You started off correctly. Just need to add the if...else... and use the function (which is ambiguously named odd_even() - but it returns True if the parameter is even):

while start:
    num = random.randint(1, 99)
    if even_odd(num):
        print("{} is even".format(num))
    else:
        print("{} is odd".format(num))

    start -= 1
Smith Thapa
Smith Thapa
7,023 Points
Smith Thapa
Smith Thapa
7,023 Points

Sir but i was not asking for the solution , I just want to know how the return statement in the function works...