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Python Python Basics Functions and Looping Raising Exceptions

How is check_please.py being run successfully if the function is never called in the python file check_please.py? Also,

Also, why does this function have two parameters if we don't use the parameters? That is, I can call the function with the two variables I want, however the input function asks me again for the variables I already specified.

2 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 67,515 Points

Hey Nathaniel Camorlinga, good question!

When python check_please.py is run from the command line, the function is compiled then later execute when the variable amount_due is assigned. That assignment calls the function with the two parameters defined by the variables total_due and number_of_people.

It’s possible to see the function run independently. If you were to start a REPL, you could try:

>>> from check_please import split_check
#... interactive stuff like in the video
>>> split_check(35, 5)
7

The “interactive stuff” is due to the module level code being exposed when importing the module. You’ll learn how to hide this code from imports using a special if statement in a later video. Not important for this question. (It’s the if __name__ == ‘__main__:’ idiom you might have seen elsewhere.

Post back if you need more help. Good luck!!!

Chris thanks for responding. I still think it does not make any sense how this function is running. This will not work in a local python environment, just in your REPL.

Chris Freeman
Chris Freeman
Treehouse Moderator 67,515 Points

I am happy to explain in more detail. Can you be more specific on part you believe will not work?

When executing the assignment to amount_due, the function split_check is called with the values from the input statements.

It may be worth copying the code to a local file and running it in your environment.

Check out this other explanation where I walk though how the code flows line by line.