Python descriptors

descr.py

import types

class StaticMethod:
    def __init__(self, f):
        self.f = f

    def __get__(self, instance, owner):
        return self.f

class ClassMethod:
    def __init__(self, f):
        self.f = f

    def __get__(self, instance, owner):
        return types.MethodType(self.f, owner)

class InstanceMethod:
    def __init__(self, f):
        self.f = f

    def __get__(self, instance, owner):
        if instance is None:
            return self.f
        return types.MethodType(self.f, instance)

class Property:
    def __init__(self, fget=None, fset=None, fdel=None):
        self.fget = fget
        self.fset = fset
        self.fdel = fdel

    def getter(self, fget):
        return Property(fget, self.fset, self.fdel)

    def setter(self, fset):
        return Property(self.fget, fset, self.fdel)

    def deleter(self, fdel):
        return Property(self.fget, self.fset, fdel)

    def __get__(self, instance, owner):
        if instance is None:
            return self
        return self.fget.__get__(instance, owner)()

    def __set__(self, instance, value):
        return self.fset.__get__(instance, type(instance))(value)

    def __delete__(self, instance):
        return self.fdel.__get__(instance, type(instance))()