[Twisted-Python] Twisted 1.1.0 - AssertionError: reactor already installed
Joe Van Andel
vanandel at atd.ucar.edu
Tue Dec 2 09:01:29 EST 2003
Using Twisted 1.1.0, Python 2.3.2, Redhat 9:
Python scripts using that import xmlprc before calling qtreactor.install()
e.g:
========================
from twisted.web.xmlrpc import Proxy
qtreactor.install(app)
=========================
fail with the traceback:
Traceback (most recent call last):
File "qtdemo2.py", line 28, in ?
qtreactor.install(app)
File
"/opt/local_rh90/lib/python2.3/site-packages/twisted/internet/qtreactor.py",
line 197, in install
installReactor(reactor)
File
"/opt/local_rh90/lib/python2.3/site-packages/twisted/internet/main.py",
line 90, in installReactor
assert not sys.modules.has_key('twisted.internet.reactor'), \
AssertionError: reactor already installed
====================================
Another demonstration of this problem:
=====================
>>> from twisted.web.xmlrpc import Proxy
>>> import sys
>>> sys.modules.has_key('twisted.internet.reactor')
True
=========================
internet/main.py, installReactor() needs a more robust test whether a
reactor has already been installed, rather than relying on whether
twisted.internet.reactor has been imported.
The workaround is to move the import statement, but this isn't always a
clean solution.
--
Joe VanAndel
National Center for Atmospheric Research
http://www.atd.ucar.edu/~vanandel/
Internet: vanandel at ucar dot edu
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