Here is an example plugin called, Hello Plugin World! This functional plugin helps developers write their very first plugin. It also shows what is mandatory for a plugin to work. These are the bare minimums for a plugin to work.

import orpg.pluginhandler #Mandatory import. This is the Plugin Handler.
import wx #Import wx if you want to create your own menu.

class Plugin(orpg.pluginhandler.PluginHandler):
    def __init__(self, plugindb, parent):
        orpg.pluginhandler.PluginHandler.__init__(self, plugindb, parent)
        self.name = 'Hello Plugin World'
        self.author = 'Prof Sir Ebral'
        self.help = 'Hello World is a basic Plugin that shows off the ease\n'
        self.help += 'at which plugins can be created.  The source helps \n'
        self.help += 'explain which portions of a plugin are needed for\n'
        self.help += 'developers to learn to write their own.'
    ##All the above material is mandatory. It defines the Plugin Class and then initiates it. The self.name, self.author,
    ##and self.help assists in defining your plugin.

    def plugin_menu(self): #Option Function, though it adds a nice GUI menu
        ##You can create a menu here.
        pass #We are passing this step

    def plugin_enabled(self): #Required Function
        ##You can create text commands here that will enable when the plugin is enabled. 
        ##Other features that are needed when the plugin enables can also be created here.
        self.plugin_addcommand('/helloworld', self.on_hello, '- Tell the world Hello Plugin World!')
        pass


    def plugin_disabled(self): #Required Function
        ##You will need to disable text commands here.
        self.plugin_removecmd('/helloworld')
        pass

    def on_hello(self, cmdargs):
        ##We call cmdargs with text commands.  This allows us to add arguments to the command.
        ##cmdargs and how they are used will be covered later.
        self.chat.Post('Hello Plugin World!', True, True)