dtype.itemsize The element size of this data-type object. For 18 of the 21 types this number is fixed by the data-type

dtype.__reduce__()

dtype.flags Bit-flags describing how this data type is to be interpreted. Bit-masks are in numpy.core.multiarray

dtype.__setstate__()

dtype.alignment The required alignment (bytes) of this data-type according to the compiler. More information

dtype.type The type object used to instantiate a scalar of this data-type.

dtype.kind A character code (one of ?biufcmMOSUV?) identifying the general kind of data.

dtype.char A unique character code for each of the 21 different built-in types.

dtype.byteorder A character indicating the byte-order of this data-type object. One of:

dtype.num A unique number for each of the 21 different built-in types. These are roughly ordered from least-to-most