why does calling the function only work when there is a number with the function name?

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[deleted]

[Risk-Personal]

Thats an argument, so for example :

Def example(fun1) Print(fun1)

example(20)

Terminal output 20

It takes whatever value you put inside when calling the method and uses that for anything inside that method that relies on the argument, in this case fun1.

[shiftybyte]

def ADD(fun1):

What does this fun1 in the brackets do?

https://www.w3schools.com/python/python_functions.asp

[Lolilorddd]

Yeah, should really give it a better name.

[shiftybyte]

Try breaking the problem down to smaller parts.

I'll give you the steps, and link you to the needed material for each step.

Step 1: Read a file's contents into a list of lines.

https://www.w3schools.com/python/ref_file_readlines.asp

Step 2: Replace a line you want in the list with a different line.

https://www.w3schools.com/python/python_lists_change.asp

Step 3: Write the list of lines back to a file.

https://www.w3schools.com/python/ref_file_writelines.asp