Hi
i have i have a class that makes temp folders to do work in. it keeps
track of them, so that in the __del__() it can clean them up. ideally
if the user of the module still has objects left at the end of their
program, they should be automatically cleaned up. in my destructor i
had a call to shutil.rmtree (which had been imported at the start of
more module), however when the destructor is called shutil has been
set to None.
i have made a minimal case to reproduce
#!/usr/bin/env python
import shutil
from math import *
class Foo(object):
def __init__(self):
print shutil
def __del__(self):
print shutil
if __name__ == '__main__':
print shutil
a = Foo()
this outputs
<module 'shutil' from '/usr/lib/python2.5/shutil.pyc'>
<module 'shutil' from '/usr/lib/python2.5/shutil.pyc'>
None
the odd thing is that if i remove the line "from math import *" then i
get the output
<module 'shutil' from '/usr/lib/python2.5/shutil.pyc'>
<module 'shutil' from '/usr/lib/python2.5/shutil.pyc'>
<module 'shutil' from '/usr/lib/python2.5/shutil.pyc'>
This seems inconsistent, and makes me wonder if it is a bug in the
interpreter.
As an ugly work around i have found that i can keep a reference to
shutil in the class.
class Foo(object):
def __init__(self):
self.shutil = shutil
print self.shutil
def __del__(self):
print shutil
print self.shutil
But given the difference an import statement can make, i am not sure
this is robust.
I have been working with Python 2.5.2 (r252:60911, Oct 5 2008,
19:24:49) from ubuntu intrepid.
(if google groups does bad things to the code formating, please see
http://ubuntuforums.org/showthread.php?p=6024623 )
Thanks
Sam
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