Because the function has three parameters, every time the function is called, it must be supplied with three arguments. This is the default behavior for Python functions; the number of parameters and ...

Writing a function in Python To create a function, first give the function a name, and name the value that the function should use in its calculations.

The one place they are pretty convenient is in languages (like Python) where multiple return values from one function can be used as multiple input parameters to another.