code: def list_and_add(a, b):
      
      if not isinstance(b, list):
          b = [b]
      if not isinstance(a, list):
          a = [a]
      return a + b
docs: Concatenate anything into a list.
  
      Args:
          a: the first thing
          b: the second thing
  
      Returns:
          list. All the things in a list.