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# numpy.issubdtype

`numpy.``issubdtype`(arg1, arg2)

  Returns True if first argument is a typecode lower/equal in type hierarchy.

  Parameters : | arg1, arg2 : dtype_like dtype or string representing a typecode.
  Returns : | out : bool

  See also

  `issubsctype`, `issubclass_`

  `numpy.core.numerictypes`
    Overview of numpy type hierarchy.

  Examples

      >>> np.issubdtype('S1', str)
      True
      >>> np.issubdtype(np.float64, np.float32)
      False