code: def np(self) -> Optional[type]:
      return np.dtype(self.fmt).type if self.fmt is not None else None
  
imports: from typing import Final, Optional, ClassVar, Set, Tuple, Dict
  from dataclasses import dataclass
  import numpy
  import functools
label_desc: Use image node_id 4 for calling the DType obj's underlying member method code with example usage: obj.np() and returns: unknown