termios disappears during object deletion
Hans Nowak
hnowak at cuci.nl
Sat Sep 4 04:09:10 EDT 1999
On 3 Sep 99, at 22:58, Brien Barton wrote:
> Can anyone explain this behavior?? For some reason, the termios and
> TERMIOS modules get wiped out when python is running the __del__ method
> during program termination. I've tried this with Python 1.5.1 on Linux
> and with Python 1.5.2 on SGI IRIX. If you explicitly delete the object,
> you don't have this problem.
>
> ~> cat test.py
> import math, termios, TERMIOS
>
> print 'math=', math
> print 'termios=', termios
> print 'TERMIOS=', TERMIOS
>
> class Test:
> def __del__(self):
> print 'deleting Test object ...'
> print 'math=', math
> print 'termios=', termios
> print 'TERMIOS=', TERMIOS
>
> t = Test()
I'm not sure, but I have a vague idea why this happens... an instance
of Test is created, then the program is finished. Python starts
cleaning up some stuff, freeing memory, etc. *Maybe* (as said, I
don't know this fer shure) it first gets rid of termios and TERMIOS,
then it takes on the Test instance t, calling its __del__ method.
This method then correctly sees that termios and TERMIOS are already
deleted.
Just an idea... I don't know much about Python's internals, but it
would make sense to me...
--Hans Nowak (zephyrfalcon at hvision.nl)
Homepage: http://fly.to/zephyrfalcon
Python Snippets: http://www.hvision.nl/~ivnowa/snippets/
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