spacepaste

>>> import dis
>>> def f():
... a = ['a']
... b = ['b']
... c = [a, b]
... a, a[0] = b, a[0]
...
>>> dis.dis(f)
2 0 LOAD_CONST 1 ('a')
3 BUILD_LIST 1
6 STORE_FAST 0 (a)
3 9 LOAD_CONST 2 ('b')
12 BUILD_LIST 1
15 STORE_FAST 1 (b)
4 18 LOAD_FAST 0 (a)
21 LOAD_FAST 1 (b)
24 BUILD_LIST 2
27 STORE_FAST 2 (c)
5 30 LOAD_FAST 1 (b)
33 LOAD_FAST 0 (a)
36 LOAD_CONST 3 (0)
39 BINARY_SUBSCR
40 ROT_TWO
41 STORE_FAST 0 (a)
44 LOAD_FAST 0 (a)
47 LOAD_CONST 3 (0)
50 STORE_SUBSCR
51 LOAD_CONST 0 (None)
54 RETURN_VALUE