Global and Local Variable

a = 1

# Uses global because there is no local 'a' 
def f(): 
	print 'Inside f() : ', a 

# Variable 'a' is redefined as a local 
def g():	 
	a = 2
	print 'Inside g() : ',a 

# Uses global keyword to modify global 'a' 
def h():	 
	global a 
	a = 3
	print 'Inside h() : ',a 

# Global scope 
print 'global : ',a 
f() 
print 'global : ',a 
g() 
print 'global : ',a 
h() 
print 'global : ',a