Extension method for python built-in types

is it possible to add extension method to python built-in types? I know that I can add extension method to defined type by simply adding new method by . as following: class myClass: pass myClass.myExtensionMethod = lambda self,x:x * 2 z = myClass() print z.myExtensionMethod(10) But is any way to adding extension method to python built'in types like list, dict, ... list.myExtension = lambda self,x:

[cknbstr]

built-inの属性にmonkeypatchするのは無理(orできるけどすげえめんどい？)っぽい。こういうところはrubyに負けるなあ