Python Code Challenges: Control Flow (Advanced) Number 4

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,
#1

Hello there,

I have tried the challenges without seeing the solution, but got confused.

https://www.codecademy.com/courses/learn-python-3/articles/advanced-python-code-challenges-control-flow

Create a function named movie_review() that has one parameter named rating.

If rating is less than or equal to 5, return "Avoid at all costs!". If rating is between 5 and 9, return "This one was fun.". If rating is 9 or above, return "Outstanding!"

The code

def movie_review(rating):
  if rating <= 5:
    return print("Avoid at all costs!")
  if (rating >= 5 and rating < 9):
    return print("This one was fun.")
  else:
    return "Outstanding!"

# Uncomment these function calls to test your movie_review function:
print(movie_review(9))
# should print "Outstanding!"
print(movie_review(4))
# should print "Avoid at all costs!"

Result

Outstanding!
Avoid at all costs!
None

my question is, where is “None” come from?

Thanks.

#2

What happens when you remove the two print() that follow the return inside the function?

Hint: you don’t need to use print() inside the function b/c you’re returning a value. You have print() both inside AND outside the function. None happens when there is no value to return.

Ex:

def blah():
    return "huh?"

print(blah())

>huh?
-------------
def blah():
    print("what's happening?")

print(blah())

>what's happening?
>None
------------
def blah():
    print("what's happening?")

blah()

>what's happening?

See also: