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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

@hct I'm very sorry about the delay in getting back to you. The reported bevaviour is the same with 3.4.1 and 3.5.0a0 on Windows 7.