How can a function use variables generated by other (functions) as parameters for itself in python?

Question

I'm learning python and I would like to separate the different processes of my code into different functions. To do that I need to give variables of previous function as a parameter to an other function . I tried some thing like this

def F1 (A):
   B=A+1 

def F2 (B):
   C=B+1
   print C  

F1(1) F2()

For example in this case I expect to get 3 as a final result.

But It doesn't work.

Answer 1

Just return it:

def F1 (A):
   return A+1

def F2 (B):
   C=B+1
   print C

# Then use it as parameter
F2(F1(1))