input: Write a function called calculate_sum_lambda that returns a lambda function to calculate the sum of two variables. This function should accept two parameters and return their sum. If any of the parameters is not a number, the lambda function should return None.
  
  assert calculate_sum_lambda(3, 4)(3, 4)==7
  assert calculate_sum_lambda(5, -2)(5, -2)==3
  assert calculate_sum_lambda(0, 0)(0, 0)==0
  assert calculate_sum_lambda('a', 4)('a', 4)==None
  assert calculate_sum_lambda(3, 'b')(3, 'b')==None
output: def calculate_sum_lambda(a, b):
      return lambda x, y: x + y if isinstance(x, (int, float)) and isinstance(y, (int, float)) else None