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Date: Wed, 01 Feb 2012 16:15:05 +0000
From: Andrea Crotti <andrea.crotti.0@gmail.com>
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:19717

So suppose I want to modify the sys.path on the fly before running some code
which imports from one of the modules added.

at run time I do
sys.path.extend(paths_to_add)

but it still doesn't work and I get an import error.

If I take these paths and add them to site-packages/my_paths.pth
everything works, but at run-time the paths which I actually see before
importing are exactly the same.

So there is something I guess that depends on the order, but what can I
reset/reload to make these paths available (I thought I didn't need 
anything in theory)?