def registerExtension(self, extension):
        self.registeredExtensions.append(extension)
        return self
Internally mark a L{IPaintable} as painted and start
dataset/ETHPy150Open isnowfy/pydown/markdown/__init__.py/Markdown.registerExtension--crossover with--dataset/ETHPy150Open rwl/muntjac/muntjac/terminal/gwt/server/abstract_communication_manager.py/AbstractCommunicationManager.paintablePainted