input: 
  from typing import List
  
  
  def calculate_sum_lambda(a: int, b: int) -> int:
      """ Calculate the sum of two variables using lambda function.
      >>> calculate_sum_lambda(3, 4)
      7
      >>> calculate_sum_lambda(0, 0)
      0
      """
      sum = lambda a, b: a + b
      return sum(a, b)
  
output:     sum = lambda a, b: a + b
      return sum(a, b)