text: i=2 
  k= 2          # global variable
  def f():
      global k
      k=5
      i=3       # this creates a new variable, it does not rebind the global i
      print(i)  # This will print 3   
      print(k)  # This will print 5
  f()
  print(i)      # This will print 2
  print(k)      # This will print 5
  