text: # Python program to demonstrate working 
  # of map. 
    
  # Return double of n 
  def addition(n): 
      return n + n
  
  # We double all numbers using map() 
  numbers = (1, 2, 3, 4) 
  result = map(addition, numbers) 
  print(list(result)) 
  
  # Double all numbers using map and lambda 
  lambda_result = map(lambda x: x + x, numbers) 
  print(list(lambda_result))