code: def dtype(self, newtype):
      self.data.dtype = newtype
  
imports: import numpy
  from ._base import _spbase, _ufuncs_with_fixed_point_at_zero
  from ._sputils import isscalarlike, validateaxis
label_desc: Use image node_id 3 for calling the _data_matrix obj's underlying member method code with example usage: obj.dtype(newtype) without return types