会合并，就是因为不相关才放一起。

循环合并会优化，楼上两位能否告知下相关资料地址？真不知道python会合并…

>>> def test():
... items = ['cat', 'meow', 'dog', 'woof']
... for item in items:
... print item
... for item in items:
... print item

>>> dis.dis(test.func_code)
2 0 LOAD_CONST 1 ('cat')
3 LOAD_CONST 2 ('meow')
6 LOAD_CONST 3 ('dog')
9 LOAD_CONST 4 ('woof')
12 BUILD_LIST 4
15 STORE_FAST 0 (items)

3 18 SETUP_LOOP 19 (to 40)
21 LOAD_FAST 0 (items)
24 GET_ITER
>> 25 FOR_ITER 11 (to 39)
28 STORE_FAST 1 (item)

4 31 LOAD_FAST 1 (item)
34 PRINT_ITEM
35 PRINT_NEWLINE
36 JUMP_ABSOLUTE 25
>> 39 POP_BLOCK

5 >> 40 SETUP_LOOP 19 (to 62)
43 LOAD_FAST 0 (items)
46 GET_ITER
>> 47 FOR_ITER 11 (to 61)
50 STORE_FAST 1 (item)

6 53 LOAD_FAST 1 (item)
56 PRINT_ITEM
57 PRINT_NEWLINE
58 JUMP_ABSOLUTE 47
>> 61 POP_BLOCK
>> 62 LOAD_CONST 0 (None)
65 RETURN_VALUE
>>>