Simple Python plugin snippet

#---------- test_a_plugin.py
class Plugin:
    def __init__(self):
        print 'instantiating test_a_plugin.py.Plugin class'
    def run(self):
        print 'run() function for test_a'


#---------- test_b_plugin.py
class Plugin:
    def __init__(self):
        print 'instantiating test_b_plugin.py.Plugin class'
    def run(self):
        print 'run() function for test_b'


#---------- mytest.py
import os
import os.path
import fnmatch
PLUGIN_GLOB = '*_plugin.py'

def get_plugin_class_objects(plugin_dir):
    '''To use, place plugin files in the same directory as this script
    and name them so that they match the PLUGIN_GLOB.'''
    class_objects = []
    files = [f for f in os.listdir(os.getcwd()) if fnmatch.fnmatch(f, PLUGIN_GLOB)]
    print files
    for f in files:
        (base, ext) = os.path.splitext(os.path.basename(f))
        if ext != '.py':
            continue
        plugin_module = __import__(base)
        # Hard coded to always expect each module to contain a class named 'Plugin'
        class_objects.append(plugin_module.Plugin)
    return(class_objects)

def main():
    plugin_class_objs = get_plugin_class_objects(PLUGIN_DIR)
    plugin_objs = [c() for c in plugin_class_objs]
    # do "something" with each plugin...
    for o in plugin_objs:
        o.run()

if __name__ == '__main__':
    main()