import types fails
lists at gregfortune.com
Thu Aug 22 01:57:56 CEST 2002
A buddy and I have ended up with some code that causes a line like
from types import DictType
to fail. Failure in this case means an apparent deadlock. The import line
executes, but never returns. This only occurs in a specific instance while
using a couple of third-party libraries so I need to know what I can do to
trace down the problem in the libraries.
Basically, what ways can Python be mangled so something simple like import
types can deadlock or otherwise not work?
1) Could this be a namespace issue?
2) Could someone be messing with __import__ and cause this kind of
3) Both libraries are linking against their own C code so could it be
something the library writer did or did not do in the C code that is
I'm really not sure where to start digging right now so any help is
If you're still with me and are interested in some details....
The libraries are MySQLdb and PyQt. A MySQLdb cursor, which is established
as a global in a wrapper module is being accessed from inside a QThread
after a connection is established outside the thread. When the cursor is
executed, the execute function in cursors.py does a function level import
(from types import ....). It's that import that fails. I've done a bunch
of tests trying to determine where the problem might be hiding and some
tests point at MySQLdb as the problem while other tests point at my code as
the problem. I've posted on the sourceforge forum for MySQLdb, but maybe
you guys might have an idea of how an import can fail like that...
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