Introduction to Python course

Question

Here, I can't totally get the function part.!

1/what's custom function? Why dowe need it?What's the purpose of it?
2/bmi() function
3/What's return value? Why do we use it?

Plz help me out

Answer 1

What's custom function?
A custom function is a user defined function, which contains X lines of code. X can be 1 and up to as many as you need.

Why do we need it? What's the purpose of it?
It makes the code reusable. If your calculation takes a hundred lines of code to get a result, you can make it into a function so it can reuse, without typing the same code again and again.

What's return value?
You can think of a function as a black box. It takes some inputs and produces some output. The output is the return value.
However, printing on screen is not the same as a function output.

Why do we use it?
You don't "need" to use it, but generally you "want" it.
A function can be printing output on screen and do nothing more, which doesn't produce a return value.
However, in most cases, you want a function to calculate a value for you, and that value can be used by other operations or functions.
Breaking a big problem into smaller pieces of problem, and make functions for the small problems, which can help you to organize and debug your code easily.

Answer 2

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