input: def difference_between_list_and_tuple(data_structure: str) -> str:
      """Explain the difference between a `list` and a `tuple` in Python.
      >>> difference_between_list_and_tuple("list")
      'A list is mutable, meaning its contents can be changed.'
      >>> difference_between_list_and_tuple("tuple")
      'A tuple is immutable, meaning its contents cannot be changed.'
      """
      if data_structure == "list":
          return "A list is mutable, meaning its contents can be changed."
      elif data_structure == "tuple":
          return "A tuple is immutable, meaning its contents cannot be changed."
output:     else:
          return "Invalid input. Please enter either 'list' or 'tuple'."