Hi,
See
http://stackoverflow.com/questions/8785899/hang-in-python-script-using-sqlalchemy-and-multiprocessing
particularly sbt's answer (http://stackoverflow.com/a/8795763/350713), and
also the Python bug reports http://bugs.python.org/issue13751 and
http://bugs.python.org/issue1692335.
The upshot is that SQLAs exceptions don't play nice with Pythons pickle.
While this may be a known issue, I could not find any discussion of it. If
this is considered a bug, let me know, and I'll file a bug report.
So, if possible, consider changing things to that SQLAs exceptions do work
with pickle. Also, I'd welcome any suggestions how to implement sbt's
copy_reg suggestion for the SQLA exception classes. Can I implement one
workaround, or so I need one for every class that has a non-trivial
constructor?
Regards, Faheem
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