Cameron Walsh wrote:
> Hi,
>
> I'm writing a python program to analyse and export volumetric data. To
> make development and extension easier, and to make it more useful to the
> public when it is released (LGPL), I would like to enable users to place
> their own python files in a "user_extensions" directory. These files
> would implement a common interface in order for the main program to be
> able to read them and execute the necessary code.
>
> My question is what is the best way of implementing this?
>
> I have investigated importing them as modules, but unless the user
> modifies the main program I cannot see how the main program can learn of
> the existence of specific modules.
>
> For example:
>
> from user_modules import *
> # directory 'user_modules' contains __init__.py allowing this
> # From here I would need a list of the imported modules, in order to
> # execute a common command on each of them, such as
>
> for module in imported_modules:
> module.initialise()
> module.get_tab_window()
>
>
> How do I get from the first bit to the second bit, or is there a better
> way of obtaining the functionality I need?
>
>
> --Cameron.
import os
files=os.listdir('user_modules')
tabs=[]
for fle in files:
if fle.endswith('.py'):
module=__import__(fle[0:-3], 'user_modules', None,
['initialise', 'get_tab_window'])
module.initialise()
tabs.append(module.get_tab_window())
*not tested*
print __import__.__doc__
__import__(name, globals, locals, fromlist) -> module
Import a module. The globals are only used to determine the context;
they are not modified. The locals are currently unused. The fromlist
should be a list of names to emulate ``from name import ...'', or an
empty list to emulate ``import name''.
When importing a module from a package, note that __import__('A.B', ...)
returns package A when fromlist is empty, but its submodule B when
fromlist is not empty.
Tuomas
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