"""
File: local2.py
Python allows local functions to be defined.

Local functions are not accessible outside
the function where it is defined.
"""

def A(n):

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

   a = 2*n
   print("a = " + str(a))
   x = B(5) 
   x = B(x) 
   print("a = " + str(a))
   return x

r = B(2)   # <--- is an error