14.14.1.11 Structure/union alignment and byte order
By default, Structure and Union fields are aligned in the same way the
C compiler does it. It is possible to override this behaviour be
specifying a _pack_ class attribute in the subclass
definition. This must be set to a positive integer and specifies the
maximum alignment for the fields. This is what #pragma pack(n)
also does in MSVC.
ctypes uses the native byte order for Structures and Unions. To
build structures with non-native byte order, you can use one of the
BigEndianStructure, LittleEndianStructure, BigEndianUnion, and
LittleEndianUnion base classes. These classes cannot contain pointer
fields.
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Release 2.5, documentation updated on 19th September, 2006.