[issue16070] Structure and native Structure (LittleEndianStructure on Windows) supports __slots__, but BigEndianStructure doesn't

[HCT]

New submission from HCT:

using official CPython 3.2.3 with a simple demonstration script (attached) to 
demonstrate inconsistency between ctypes structures

from ctypes import *

class cbs( BigEndianStructure ):
    __slots__ = tuple()
    def __init__( self, *args, **kw ):
        super().__init__( *args, **kw )
        self.a = 11

class cls( LittleEndianStructure ):
    __slots__ = tuple()
    def __init__( self, *args, **kw ):
        super().__init__( *args, **kw )
        self.a = 11

class cs( Structure ):
    __slots__ = tuple()
    def __init__( self, *args, **kw ):
        super().__init__( *args, **kw )
        self.a = 11

try :
    cbs1=cbs()
except AttributeError as e:
    print(e)

try :
    cls1=cls()
except AttributeError as e:
    print(e)

try :
    cs=cs()
except AttributeError as e:
    print(e)



yields

'cls' object has no attribute 'a'
'cs' object has no attribute 'a'



I expect cbs to throw error too, but itwent through the initalization and 
silently ignored the __slots__ defined in the class

----------
components: ctypes
files: slots_test.py
messages: 171402
nosy: hct
priority: normal
severity: normal
status: open
title: Structure and native Structure (LittleEndianStructure on Windows) 
supports __slots__, but BigEndianStructure doesn't
type: behavior
versions: Python 3.2
Added file: http://bugs.python.org/file27323/slots_test.py

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