attribute
dtype.flags
Bit-flags describing how this data type is to be interpreted.
Bit-masks are in numpy._core.multiarray as the constants ITEM_HASOBJECT, LIST_PICKLE, ITEM_IS_POINTER, NEEDS_INIT, NEEDS_PYAPI, USE_GETITEM, USE_SETITEM. A full explanation of these flags is in C-API documentation; they are largely useful for user-defined data-types.
The following example demonstrates that operations on this particular dtype requires Python C-API.
Examples
>>> importnumpyasnp>>> x=np.dtype([('a',np.int32,8),('b',np.float64,6)])>>> x.flags16>>> np._core.multiarray.NEEDS_PYAPI16