What is def() and return function?

Question

I am just starting out on python..although still in while loop function..I mostly see def() and return functions a lot..so was Keen on what those functions mean..would appreciate an answer..

Answer 1

def is when you define a function

def add():
x=3
return x

this is an example of a very basic function. it is declared with "def". given a name "add" and has no arguments "()".. inside this function is does stuff. in this case, it declares x to be 3. finally it returns x. so by calling add() it gives you 3.

more useful example-

def add(a,b):
c=a+b
return c

This one defines a function called "add" with 2 arguments "a,b". when you call it with add(2,3) it will take a and b, add them together and return them. so add(2,4) returns 6. add(3,1) returns 4