"""
File: local3.py
Python allows local functions to be defined.

Below the local function B can be seen in
the body of local function C, since C
can see all of A's local variables

However, B cannot see C's local variables
(or vice versa).
"""

def A(n):

   def B(y):
      nonlocal a 
      a = a + 1 
      return y + a

   def C(z) :
      b = B(z)
      c = B(b)
      a = 0    # not the one in A
      return c

   a = 2*n
   x = C(7) 
   print("a = " + str(a))
   return x

r = A(2)
print ("r = " + str(r))