input: Write a function that calculates the sum of two variables using lambda. The function should take two arguments and return their sum. If the provided arguments are not numbers, it should return None. It should also include assert statements to test the function with different inputs.
  
  
  assert calculate_sum(3, 4) == 7
  assert calculate_sum(0, 0) == 0
  assert calculate_sum(-1, 1) == 0
  assert calculate_sum(3.5, 4.5) == 8.0
  assert calculate_sum("3", 4) is None
  assert calculate_sum(None, 4) is None
  
output: calculate_sum = lambda a, b: a + b if isinstance(a, (int, float)) and isinstance(b, (int, float)) else None