Python 3.0a1 on Linux and MacOS X 10.4.10 exits differently than Python 
2.4 and 2.5.

With previous Python binaries the destructor** function of any pre-
loaded shared library is called prior to exit.  With Python 3.0a1 it is 
not, neither when exiting Python from the command line with Ctrl-D nor 
when using exit().

A workaround is to install a SIGABRT signal handler from the library and 
exit Python with os.abort().

Python 3.0a1 was built from source using the standard build sequence 
without any ./configure options except --prefix. 

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**) defined with GNU __attribute__((destructor)).  The shared library is  
loaded through environment variable LD_PRELOAD on Linux and 
DYLD_INSERT_LIBRARIES on MacOS X.