X = 1

def nester():
   print(X)                 # Global: 1
   class C:
       print(X)             # Global: 1
       def method1(self):
           print(X)         # Global: 1
       def method2(self):
           X = 3            # Hides global
           print(X)         # Local: 3
   I = C()
   I.method1()
   I.method2()

print(X)                    # Global: 1
nester()                    # Rest: 1, 1, 1, 3