importing / loading a module / class dynamically

[hg]

Hi,

I have the following problem.

I find in a directory hierarchy some files following a certain sets of
rules:

.../.../../plugin/name1/name1.py
....
.../.../../plugin/namen/namen.py

each file will in turn have a class with the same name as the filename
(minus .py)


I fetch those names in a list of string and want to import the files /
instantiate the classes.


I block at the beginning and tried this (test.py is a real file)
>>> s = 'test.py'
>>> eval ('import ' + s)

and get 

Traceback (most recent call last):
  File "<pyshell#1>", line 1, in -toplevel-
    eval ('import ' + s)
  File "<string>", line 1
    import test.py

Any clue ?

Thanks

hg