# FAQ: Lambda Function Code Challenge - Even/Odd

This community-built FAQ covers the “Even/Odd” exercise from the lesson “Lambda Function Code Challenge”.

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This exercise can be found in the following Codecademy content:
Data Science

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my solution:
even_or_odd = lambda num: “odd” if num%2 > 0 else “even”

I originally was trying to define “even” first but kept getting errors because I was defining “even” by num%2 = 0. The system did not like the equal sign within the function.

From there, I was able to find this solution as well:
even_or_odd = lambda num: “even” if num%2 < 1 else “odd”

I did the same thing. Try using ‘==’ instead of ‘=’ in the lambda function. The below solution worked for me:

even_or_odd = lambda num: “even” if num%2 == 0 else “odd”

My first go was: even_or_odd = lambda num: “even” if num%2 = 0 else “odd”. This was unsuccessful because of the single ‘=’. A double ‘==’ works. Why is this?

“=” is used to assign a value to a variable. “==” is used instead for comparison

even_or_odd = lambda foo: “even” if foo % 2 == 0 else “odd”
print even_or_odd(10)
print even_or_odd(5)

Why do we not need to use parenthesis here to print out the lambda functions? Is this because this course was designed using an older version of Python?

Thanks.

Yes `print` was a statement rather than a function in earlier versions of Python. Once it was set up as a function (3.x) it was made available to older Python2 versions with `from __future__ import print_function`.

Generally that import removes the option to use `print` as a statement but most codecademy lessons, even those that execute a script with Python2.x seem to accept `print` as both a function and a statement.

hello lovely people!
can someone help me identify why this is wrong? or point, if relevant what should be removed/changed/added?
thank you!!!

even_or_odd = lambda num: “even” if num%2 else “odd”

error:

If the input is odd, return `"odd"`

What is the outcome of `num % 2`? Using logic like this is a test of truthiness of the object, so you’re effectively doing the same as `bool(num % 2)`.

Once you’re sure about the output of `num % 2` for various values you should check what happens when you do your truth_value_testing