# File: global10.py
#
# Another example of a function calling
# a function.
#
# Here x is global in test(), so the value
# of x in foo() has no effect on the 
# execution of test(), b is still undefined.
#

b = 101

def test() :
   if x == 11:
      b = 17
   print("b = ", b)
   return

def foo() :
   b = 202
   x = 11 
   test()
   return

b = 303
x = 33
foo()


'''
Output from the program:

Traceback (most recent call last):
  File "global10.py", line 27, in <module>
    foo()
  File "global10.py", line 22, in foo
    test()
  File "global10.py", line 16, in test
    print("b = ", b)
UnboundLocalError: local variable 'b' referenced before assignment


'''