1class Descriptor:
2    def __get__(self, obj, cls):
3        print('get')
4        print(type(obj) is Main)
5        print(cls is Main)
6        return 'result'
7
8    def __set__(self, obj, val):
9        print('set')
10        print(type(obj) is Main)
11        print(val)
12
13    def __delete__(self, obj):
14        print('delete')
15        print(type(obj) is Main)
16
17class Main:
18    Forward = Descriptor()
19
20m = Main()
21try:
22    m.__class__
23except AttributeError:
24    print("SKIP")
25    raise SystemExit
26
27r = m.Forward
28if 'Descriptor' in repr(r.__class__):
29    print('SKIP')
30    raise SystemExit
31
32print(r)
33m.Forward = 'a'
34del m.Forward
35