dtype.fields Dictionary of named fields defined for this data type, or None. The dictionary is indexed

dtype.names Ordered list of field names, or None if there are no fields. The names are ordered according

dtype.subdtype Tuple (item_dtype, shape) if this

dtype.base

dtype.isalignedstruct Boolean indicating whether the dtype is a struct which maintains field alignment. This flag

dtype.descr Array-interface compliant full description of the data-type. The format is that required by the ?descr

dtype.shape Shape tuple of the sub-array if this data type describes a sub-array, and () otherwise.

numpy.issubclass_(arg1, arg2)

dtype.isbuiltin Integer indicating how this dtype relates to the built-in dtypes. Read-only.

numpy.issctype(rep)