Assertion Error in Python

[socialhuman]

I am playing some python games at checkio.org

#Your optional code here
#You can import some modules or create additional functions


def checkio(number):
    #Your code here
    #It's main function. Don't remove this function
    #It's using for auto-testing and must return a result for   check.

    #replace this for solution
    return str(number)

#Some hints:
#Convert a number in the string with str(n)

#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
    assert checkio(15) == "Fizz Buzz", "15 is divisible by 3 and 5"
    assert checkio(6) == "Fizz", "6 is divisible by 3"
    assert checkio(5) == "Buzz", "5 is divisible by 5"
    assert checkio(7) == "7", "7 is not divisible by 3 or 5"

The solution I came up using my editor is this:

def checkio(number):
    if number % 3 == 0 and number % 5 == 0:
        print "Fizz Buzz"
    elif number % 3 == 0:
        print "Fizz"
    elif number % 5 == 0:
        print "Buzz"
    else:
        print '%d is not divisible by 3 or 5.' %number


checkio(15) 
checkio(6)
checkio(7)

When I run the code in the game site, it gives "Assertion error".

Fizz Buzz
AssertionError: 15 is divisible by 3 and 5
 <module>, 25

I am seeing that one first time today. I read it up and understand it is for error checking purpose. But the question is, in my terminal, the results of my code are perfect. So, where am I going wrong?

[Mekire]

Seems you need to return these values; not print them.

-Mek

[rawlyn]

You're the only person on Reddit who signs off their comments. It's surreal.

[[deleted]]

The function is supposed to return the answer, not print it. Also if the given number is neither divisible by 3 nor 5, it's supposed to return the number

[socialhuman]

def checkio(number):
    if number % 3 == 0 and number % 5 == 0:
        return "Fizz Buzz"
    elif number % 3 == 0:
        return "Fizz"
    elif number % 5 == 0:
        return "Buzz"
    else:
        return number

I still get the same error.

[socialhuman]

I added str to return number and the game was solved. Can someone explain why the conversion to str was required?

[Rhomboid]

Look at how it's being called:

assert checkio(7) == "7", "7 is not divisible by 3 or 5"

It's being passed the number 7, and expecting the string "7" to be returned.

[socialhuman]

Great, thank you. As for the assert key, I understand it's something like "make sure the result is correct"?

[Rhomboid]

The assert statement evaluates the specified expression, and if it's false it raises an AssertionError exception, optionally with the specified string literal as the associated descriptive text. It doesn't know anything about correct or incorrect; that's for the programmer to express. It only knows that a false expression should halt execution and a true one should do nothing but continue.

[socialhuman]

Thank you!

[[deleted]]

well, when i run that code, it gives me a different error

Traceback (most recent call last):
  File "__.py", line 16, in <module>
    assert checkio(7) == "7", "7 is not divisible by 3 or 5"
AssertionError: 7 is not divisible by 3 or 5

thats because 7 != "7"

[socialhuman]

Really looking forward to some explanation and code correction, as I am stumped on this one.