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Is that true? loader.load_module(pkg) should return sys.modules[pkg]
without reloading if it already exists. See PEP 302 "Specification part
1: The Importer Protocol":
The load_module() method has a few responsibilities that it must
fulfil *before* it runs any code:
 - If there is an existing module object named 'fullname' in
 sys.modules, the loader must use that existing module.
 (Otherwise, the reload() builtin will not work correctly.)
 If a module named 'fullname' does not exist in sys.modules,
 the loader must create a new module object and add it to
 sys.modules.
I've added a test for this, but I'm not 100% sure it's right. It
certainly works with unchanged code. If you can make it fail, let me
know and I'll work up a fix. But I think repeated calls to load_module()
should be safe (assuming loaders work as required by PEP 302).