input: from typing import Tuple
  
  def calculate_sum_with_lambda(a: int, b: int) -> int:
      """ Calculate the sum of two variables using lambda expression.
      >>> calculate_sum_with_lambda(3, 4)
      7
      >>> calculate_sum_with_lambda(0, 0)
      0
      """
      sum_func = lambda x, y: x + y
      return sum_func(a, b)
output:     sum_func = lambda x, y: x + y
      return sum_func(a, b)