1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
class Descriptor:
def __get__(self, obj, cls):
print('get')
print(type(obj) is Main)
print(cls is Main)
return 'result'
def __set__(self, obj, val):
print('set')
print(type(obj) is Main)
print(val)
def __delete__(self, obj):
print('delete')
print(type(obj) is Main)
class Main:
Forward = Descriptor()
m = Main()
try:
m.__class__
except AttributeError:
# Target doesn't support __class__.
print("SKIP")
raise SystemExit
r = m.Forward
if 'Descriptor' in repr(r.__class__):
# Target doesn't support descriptors.
print('SKIP')
raise SystemExit
# Test assignment and deletion.
print(r)
m.Forward = 'a'
del m.Forward
# Test that lookup of descriptors like __get__ are not passed into __getattr__.
class NonDescriptor:
def __getattr__(self, attr):
print("getattr", attr)
class TestClass:
non_descriptor = NonDescriptor()
print(isinstance(TestClass().non_descriptor, NonDescriptor))
t = TestClass()
t.non_descriptor = 123
print(t.non_descriptor)
try:
del TestClass().non_descriptor
except AttributeError:
print("AttributeError")
|
