import and shared global variables

Diez B. Roggisch deets at nospam.web.de
Fri Mar 10 15:18:51 CET 2006


> I'm implementing a plugin-based program, structured like the example
> below (where m1 in the main module, loading m2 as a plugin).  I wanted
> to use a single global variable (m1.glob in the example) to store some
> config data that the plugins can access.  However, the output shown
> belown seems to imply that glob is *copied* or recreated during the
> import in m2.  Am I missing something? I thought m1 should be in
> sys.modules and not be recreated during the import in m2.

Yes, you are missing that your first glob is in __main__.glob, _not_ in
m1.glob.

To make that happen, use something like this:

glob = [1]
def main():
   pass

if __name__ == "__main__":
    import m1
    m1.main()


Diez



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