# File: global06.py
#
# b is considered defined in test() if there
# is an assignment to b *anywhere* in test().
# If b is defined in test() after its first
# use, then there is an "undefined value
# error". 
#
# It is *not* the case that b is global in
# test() before it is defined
#
# Scope is lexical. Binding is dynamic.
#

def test() :
   print("b = ", b)
   b = 1
   return

b = 303
test()
print("b = ", b)


'''
Output from the program:

Traceback (most recent call last):
  File "global06.py", line 21, in <module>
    test()
  File "global06.py", line 16, in test
    print("b = ", b)
UnboundLocalError: local variable 'b' referenced before assignment

'''