At 02:04 PM 6/12/03 -0400, Guido van Rossum wrote:
> > >The big problem is that it would require a major rewrite of the sys
> > >module, wouldn't it?
> >
> > Under 2.2 this would be easy because you could just do 'sys.__class__ =
> > MyNewSysClass'. Can you still do that in 2.3 as long as
> 'MyNewSysClass' is
> > a non-heap type with a compatible layout?
>
>I very much doubt that this worked in any version of Python 2.2 or
>later.
Python 2.2.2 (#37, Oct 14 2002, 17:02:34) [MSC 32 bit (Intel)] on win32
Type "copyright", "credits" or "license" for more information.
IDLE 0.8 -- press F1 for help
>>> from types import ModuleType
>>> import sys
>>> class NewSys(ModuleType):
__slots__ = ()
def exc_type(self):
return self.__dict__['exc_type']
exc_type = property(exc_type)
>>> sys.__class__ = NewSys
>>> try:
raise TypeError
except:
print sys.exc_type
exceptions.TypeError
>>>
>>> sys.exc_type = 1
Traceback (most recent call last):
File "<pyshell#33>", line 1, in ?
sys.exc_type = 1
AttributeError: can't set attribute
>>> sys.__class__ = ModuleType
>>> sys.exc_type = 1
>>>
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