Dave Challis wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> I'm trying to write some code which:
> 1. Finds all modules in a plugin directory
> 2. Imports those modules
> 3. Creates an instance of each object defined in the module (each module
> will contain exactly 1 object, which is a subclass of 'Plugin')
>
> The closest I've come so far is with something like:
>
> In plugin.py:
> # taken from http://docs.python.org/lib/built-in-funcs.html
> def my_import(name):
> mod = __import__(name)
> components = name.split('.')
> for comp in components[1:]:
> mod = getattr(mod, comp)
> return mod
>
> def import_plugins():
> mods = []
> for filename in os.listdir('/plugins'):
> if filename.endswith('.py'):
> name = os.path.splitext(filename)[0]
> mods.append(my_import('plugins.' + name))
> return mods
>
> class Plugin(object):
> pass
>
>
> In plugins/exampleplugin.py:
> class ExamplePlugin(Plugin):
> def __init__(self):
> pass
>
>
> Calling import_plugins() then gives me a list containing references to
> modules.
>
> How can I loop through that list and create an instance of whatever
> object was defined within the module? (In this case I'd want to
> construct an instance of ExamplePlugin)
Like this:
for name in dir(plugin):
thing = getattr(plugin, name)
try:
if issubclass(thing, Plugin):
thing()
except ValueError: # issubclass sucks
pass
Diez
--
http://mail.python.org/mailman/listinfo/python-list
