1. Different equal int objects:
  obj1: type=<class 'int'>, str=257, id=39305936
  obj2: type=<class 'int'>, str=257, id=39306160
  a) obj1 is obj2: False
  b) obj1 == obj2: True
  c) [obj1] == [obj2]: True
  d) {obj1:'v'} == {obj2:'v'}: True
  e) {'k':obj1} == {'k':obj2}: True
  f) obj1 == obj2: True

2. Same int object:
  obj1: type=<class 'int'>, str=257, id=39305936
  obj2: type=<class 'int'>, str=257, id=39305936
  a) obj1 is obj2: True
  b) obj1 == obj2: True
  c) [obj1] == [obj2]: True
  d) {obj1:'v'} == {obj2:'v'}: True
  e) {'k':obj1} == {'k':obj2}: True
  f) obj1 == obj2: True

3. Different equal float objects:
  obj1: type=<class 'float'>, str=257.0, id=5734664
  obj2: type=<class 'float'>, str=257.0, id=5734640
  a) obj1 is obj2: False
  b) obj1 == obj2: True
  c) [obj1] == [obj2]: True
  d) {obj1:'v'} == {obj2:'v'}: True
  e) {'k':obj1} == {'k':obj2}: True
  f) obj1 == obj2: True

4. Same float object:
  obj1: type=<class 'float'>, str=257.0, id=5734664
  obj2: type=<class 'float'>, str=257.0, id=5734664
  a) obj1 is obj2: True
  b) obj1 == obj2: True
  c) [obj1] == [obj2]: True
  d) {obj1:'v'} == {obj2:'v'}: True
  e) {'k':obj1} == {'k':obj2}: True
  f) obj1 == obj2: True

5. Different float NaN objects:
  obj1: type=<class 'float'>, str=nan, id=5734784
  obj2: type=<class 'float'>, str=nan, id=5734976
  a) obj1 is obj2: False
  b) obj1 == obj2: False
  c) [obj1] == [obj2]: False
  d) {obj1:'v'} == {obj2:'v'}: False
  e) {'k':obj1} == {'k':obj2}: False
  f) obj1 == obj2: False

6. Same float NaN object:
  obj1: type=<class 'float'>, str=nan, id=5734784
  obj2: type=<class 'float'>, str=nan, id=5734784
  a) obj1 is obj2: True
  b) obj1 == obj2: False
  c) [obj1] == [obj2]: True
  d) {obj1:'v'} == {obj2:'v'}: True
  e) {'k':obj1} == {'k':obj2}: True
  f) obj1 == obj2: False

7. Different objects (with equal x) of class C
   (C.__eq__() implemented with equality of x,
    C.__ne__() returning NotImplemented):
  obj1: type=<class '__main__.C'>, str=C(256), id=39406504
  obj2: type=<class '__main__.C'>, str=C(256), id=39406616
  a) obj1 is obj2: False
C.__eq__(): self=39406504, other=39406616, returning True
  b) obj1 == obj2: True
C.__eq__(): self=39406504, other=39406616, returning True
  c) [obj1] == [obj2]: True
C.__eq__(): self=39406616, other=39406504, returning True
  d) {obj1:'v'} == {obj2:'v'}: True
C.__eq__(): self=39406504, other=39406616, returning True
  e) {'k':obj1} == {'k':obj2}: True
C.__eq__(): self=39406504, other=39406616, returning True
  f) obj1 == obj2: True

8. Same object of class C
   (C.__eq__() implemented with equality of x,
    C.__ne__() returning NotImplemented):
  obj1: type=<class '__main__.C'>, str=C(256), id=39406504
  obj2: type=<class '__main__.C'>, str=C(256), id=39406504
  a) obj1 is obj2: True
C.__eq__(): self=39406504, other=39406504, returning True
  b) obj1 == obj2: True
  c) [obj1] == [obj2]: True
  d) {obj1:'v'} == {obj2:'v'}: True
  e) {'k':obj1} == {'k':obj2}: True
C.__eq__(): self=39406504, other=39406504, returning True
  f) obj1 == obj2: True

9. Different objects (with equal x) of class D
   (D.__eq__() implemented with inequality of x,
    D.__ne__() returning NotImplemented):
  obj1: type=<class '__main__.D'>, str=C(256), id=39407064
  obj2: type=<class '__main__.D'>, str=C(256), id=39406952
  a) obj1 is obj2: False
D.__eq__(): self=39407064, other=39406952, returning False
  b) obj1 == obj2: False
D.__eq__(): self=39407064, other=39406952, returning False
  c) [obj1] == [obj2]: False
D.__eq__(): self=39406952, other=39407064, returning False
  d) {obj1:'v'} == {obj2:'v'}: False
D.__eq__(): self=39407064, other=39406952, returning False
  e) {'k':obj1} == {'k':obj2}: False
D.__eq__(): self=39407064, other=39406952, returning False
  f) obj1 == obj2: False

10. Same object of class D
   (D.__eq__() implemented with inequality of x,
    D.__ne__() returning NotImplemented):
  obj1: type=<class '__main__.D'>, str=C(256), id=39407064
  obj2: type=<class '__main__.D'>, str=C(256), id=39407064
  a) obj1 is obj2: True
D.__eq__(): self=39407064, other=39407064, returning False
  b) obj1 == obj2: False
  c) [obj1] == [obj2]: True
  d) {obj1:'v'} == {obj2:'v'}: True
  e) {'k':obj1} == {'k':obj2}: True
D.__eq__(): self=39407064, other=39407064, returning False
  f) obj1 == obj2: False