# numpy.issubdtype

numpy.issubdtype(arg1, arg2)

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

  This is like the builtin `issubclass`, but for `dtype`s.

  Parameters
    arg1, arg2 dtype_like

      `dtype` or object coercible to one

  Returns
    out bool

  See also

  Scalars

    Overview of the numpy type hierarchy.

  `issubsctype`, `issubclass_`

  Examples

  `issubdtype` can be used to check the type of arrays:

      >>> ints = np.array([1, 2, 3], dtype=np.int32)
      >>> np.issubdtype(ints.dtype, np.integer)
      True
      >>> np.issubdtype(ints.dtype, np.floating)
      False

      >>> floats = np.array([1, 2, 3], dtype=np.float32)
      >>> np.issubdtype(floats.dtype, np.integer)
      False
      >>> np.issubdtype(floats.dtype, np.floating)
      True

  Similar types of different sizes are not subdtypes of each other:

      >>> np.issubdtype(np.float64, np.float32)
      False
      >>> np.issubdtype(np.float32, np.float64)
      False

  but both are subtypes of `floating`:

      >>> np.issubdtype(np.float64, np.floating)
      True
      >>> np.issubdtype(np.float32, np.floating)
      True

  For convenience, dtype-like objects are allowed too:

      >>> np.issubdtype('S1', np.string_)
      True
      >>> np.issubdtype('i4', np.signedinteger)
      True

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