Das deutsche Python-Forum

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#!/usr/bin/python

import types
import os

class pyEnv(object): 
    def __init__(self):
        self.commands = {}
        for plugin in self.plugins:
            plugin = __import__(os.path.join('plugins', plugin))
            for key, value in plugin.__dict__.iteritems():
                if type(value) == types.FunctionType:
                    self.register_command(key, value)
                
    def register_command(self, command, callback):
        if not self.commands.has_key(command):
            self.commands[command] = callback
            
    def parse(self, string):
        tokens = string.split()
        command = tokens[0].lower()
        
        if self.commands.has_key(command):
            self.commands[command](tokens[1:])
            
    @property
    def plugins(self):
        plugins = []
        for file in os.listdir(os.path.join('plugins')):
            if not file.startswith('__') and file.endswith('.py'):
                plugins.append(file.split('.py')[0])
        
        return plugins
    
pyenv = pyEnv()

while True:
    command = str(raw_input('>>> '))
    
    if command:
        pyenv.parse(command)

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def say(args):
    print ' '.join(args)

...

>>> say Hallo wie gehts?
Hallo wie gehts?
>>>

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class InvalidPlugin(Exception):
    pass

mymodule = __import__(...)
init_func = getattr(mymodule, "init_plugin", None)
if init_func is None:
    raise InvalidPlugin("Plugin has no init_plugin function")
else:
    init_func()

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class MyPlugin(Plugin)

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class Plugin(object):
    def __plugin_init__(self):
        return self

class MyPlugin(Plugin):
    def __init__(self):
        Plugin.__plugin_init__(self)

    def methode(self, args, pyenv):
        print ' '.join(args)
        for key, value in pyenv.commands.iteritems():
            print '%s: %s' % (key, value)