code: def contains_all(self, other):
          
          dtype = getattr(other, 'dtype', None)
          if dtype is None:
              dtype = np.result_type(*other)
          dtype_str = np.dtype('S{}'.format(self.length))
          dtype_uni = np.dtype('<U{}'.format(self.length))
          return dtype in (dtype_str, dtype_uni)
docs: Return ``True`` if all strings in ``other`` have size `length`.