Gabriel Rossetti wrote: > I have three modules A, B, C; > > A declares this globally : > > UpdateEvent, UPDATE_EVENT_ID = wx.lib.newevent.NewEvent() > > Then they import stuff from each other: > > - A imports a constant from module B (in "__main__") > - A imports a class and some constants from module C > - B imports a constant from module A > - C imports UPDATE_EVENT_ID from module A > > What happens is that since A imports stuff from B which then in turn > loads something from A, UPDATE_EVENT_ID gets redefined and when A sends > an event to C, C doesn't do anything since it doesn't have the same > UPDATE_EVENT_ID. Does anyone have an idea on how to fix this? If it had > been a statically defined variable then that wouldn't be "bad", but > since it's dynamic it does pose problems. More globally, how cn I > prevent this even with static constants? I don't think it's that great > to redefine the stuff multiple times and I've already had this problem > in the past with a constant dict.
Imported modules are cached, so this problem shouldn't occur unless you use A.py as your main script. In this case it will be cached as "__main__", and if you import it elsewhere a second copy will be executed and cached as "A". To fix it create a wrapper script that doesn't create any objects that will be used elsewhere, e. g. #!/usr/bin/env python import A A.main() assuming the function A.main() contains the code to start your application and invoke that instead of A.py Peter -- http://mail.python.org/mailman/listinfo/python-list
