program.py

import impplugin_dirs = [".", "plugins"]def load_plugin(name):    fd, path, desc = imp.find_module(name, plugin_dirs)    try:        return imp.load_module(name, fd, path, desc)    finally:        if fd: fd.close()try:    plugin = load_plugin("plugin")    obj = plugin.create()    obj.bar()except ImportError:    print "No plugin"