[Python-Dev] PEP: Adding data-type objects to Python (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Tue Oct 31 08:51:25 CET 2006

Travis Oliphant schrieb:

So, the big difference is that I think data-formats should be instances of a single type.

This is nearly the case for ctypes as well. All layout descriptions are instances of the type type. Nearly, because they are instances of subtypes of the type type:

py> type(ctypes.c_long) <type '_ctypes.SimpleType'> py> type(ctypes.c_double) <type '_ctypes.SimpleType'> py> type(ctypes.c_double).bases (<type 'type'>,) py> type(ctypes.Structure) <type '_ctypes.StructType'> py> type(ctypes.Array) <type '_ctypes.ArrayType'> py> type(ctypes.Structure).bases (<type 'type'>,) py> type(ctypes.Array).bases (<type 'type'>,)

So if your requirement is "all layout descriptions ought to have the same type", then this is (nearly) the case: they are instances of type (rather then datatype, as in your PEP).

Regards, Martin

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