How to call a function within a function?

Question

Python

The code:

>>> def a():
  a = 5
  def b():
      nonlocal a 
      print(a)

Can you please tell me how to call the b() function?
Of course, I understand that you can add a call to this function b () at the end.
Like this:

def a():
  a = 5
  def b():
      nonlocal a 
      print(a)
  b()

but can it be done without this command at the end?
Since for my program I need to call the b () function a little later.
Tell me please)))

Answer 1

def a():
  a = 5
  def b():
      nonlocal a 
      print(a)
  return b

fb = a()
fb()

Answer 2

through the display statement

Answer 3

Just put b() where you need to call this function.
Do you need to call this function in the body of function a or somewhere else?