如果在课程中，则可以使用getattr：
class MyClass(object): def install(self): print "In install"method_name = 'install' # set by the command line optionsmy_cls = MyClass()method = Nonetry: method = getattr(my_cls, method_name)except AttributeError: raise NotImplementedError("Class `{}` does not implement `{}`".format(my_cls.__class__.__name__, method_name))method()或者它是一个函数：
def install(): print "In install"method_name = 'install' # set by the command line optionspossibles = globals().copy()possibles.update(locals())method = possibles.get(method_name)if not method: raise NotImplementedError("Method %s not implemented" % method_name)method()
