某道逆向题(并非正在比赛)，给了一串python字节码
1 0 LOAD_CONST 0 (-1)
3 LOAD_CONST 1 (None)
6 IMPORT_NAME 0 (os)
9 STORE_NAME 0 (os)
4 12 LOAD_CONST 2 (0)
15 STORE_NAME 1 (a)
5 18 LOAD_NAME 2 (input)
21 CALL_FUNCTION 0
24 STORE_NAME 3 (flag)
6 27 SETUP_LOOP 36 (to 66)
30 LOAD_NAME 4 (range)
33 LOAD_NAME 5 (len)
36 LOAD_NAME 3 (flag)
39 CALL_FUNCTION 1
42 CALL_FUNCTION 1
45 GET_ITER
>> 46 FOR_ITER 16 (to 65)
49 STORE_NAME 6 (i)
7 52 LOAD_NAME 1 (a)
55 LOAD_CONST 3 (1)
58 INPLACE_ADD
59 STORE_NAME 1 (a)
62 JUMP_ABSOLUTE 46
>> 65 POP_BLOCK
9 >> 66 LOAD_NAME 1 (a)
69 LOAD_CONST 4 (32)
72 COMPARE_OP 3 (!=)
75 POP_JUMP_IF_FALSE 93
10 78 LOAD_CONST 5 ('error')
81 PRINT_ITEM
82 PRINT_NEWLINE
11 83 LOAD_NAME 7 (exit)
86 CALL_FUNCTION 0
89 POP_TOP
90 JUMP_FORWARD 0 (to 93)
13 >> 93 LOAD_NAME 3 (flag)
96 LOAD_CONST 2 (0)
99 BINARY_SUBSCR
100 LOAD_CONST 6 ('f')
103 COMPARE_OP 3 (!=)
106 POP_JUMP_IF_TRUE 189
109 LOAD_NAME 3 (flag)
112 LOAD_CONST 3 (1)
115 BINARY_SUBSCR
116 LOAD_CONST 7 ('l')
119 COMPARE_OP 3 (!=)
122 POP_JUMP_IF_TRUE 189
125 LOAD_NAME 3 (flag)
128 LOAD_CONST 8 (2)
131 BINARY_SUBSCR
132 LOAD_CONST 9 ('a')
135 COMPARE_OP 3 (!=)
138 POP_JUMP_IF_TRUE 189
141 LOAD_NAME 3 (flag)
144 LOAD_CONST 10 (3)
147 BINARY_SUBSCR
148 LOAD_CONST 11 ('g')
151 COMPARE_OP 3 (!=)
154 POP_JUMP_IF_TRUE 189
157 LOAD_NAME 3 (flag)
160 LOAD_CONST 12 (4)
163 BINARY_SUBSCR
164 LOAD_CONST 13 ('{')
167 COMPARE_OP 3 (!=)
170 POP_JUMP_IF_TRUE 189
173 LOAD_NAME 3 (flag)
176 LOAD_CONST 14 (31)
179 BINARY_SUBSCR
180 LOAD_CONST 15 ('}')
183 COMPARE_OP 3 (!=)
186 POP_JUMP_IF_FALSE 204
14 >> 189 LOAD_CONST 5 ('error')
192 PRINT_ITEM
193 PRINT_NEWLINE
15 194 LOAD_NAME 7 (exit)
197 CALL_FUNCTION 0
200 POP_TOP
201 JUMP_FORWARD 0 (to 204)
17 >> 204 BUILD_LIST 0
207 STORE_NAME 8 (tmp)
19 210 SETUP_LOOP 37 (to 250)
213 LOAD_NAME 4 (range)
216 LOAD_NAME 1 (a)
219 CALL_FUNCTION 1
222 GET_ITER
>> 223 FOR_ITER 23 (to 249)
226 STORE_NAME 6 (i)
20 229 LOAD_NAME 8 (tmp)
232 LOAD_ATTR 9 (append)
235 LOAD_NAME 3 (flag)
238 LOAD_NAME 6 (i)
241 BINARY_SUBSCR
242 CALL_FUNCTION 1
245 POP_TOP
246 JUMP_ABSOLUTE 223
>> 249 POP_BLOCK
22 >> 250 SETUP_LOOP 44 (to 297)
253 LOAD_NAME 4 (range)
256 LOAD_NAME 1 (a)
259 CALL_FUNCTION 1
262 GET_ITER
>> 263 FOR_ITER 30 (to 296)
266 STORE_NAME 6 (i)
23 269 LOAD_NAME 10 (ord)
272 LOAD_NAME 8 (tmp)
275 LOAD_NAME 6 (i)
278 BINARY_SUBSCR
279 CALL_FUNCTION 1
282 LOAD_CONST 16 (9)
285 BINARY_SUBTRACT
286 LOAD_NAME 8 (tmp)
289 LOAD_NAME 6 (i)
292 STORE_SUBSCR
293 JUMP_ABSOLUTE 263
>> 296 POP_BLOCK
25 >> 297 SETUP_LOOP 38 (to 338)
300 LOAD_NAME 4 (range)
303 LOAD_NAME 1 (a)
306 CALL_FUNCTION 1
309 GET_ITER
>> 310 FOR_ITER 24 (to 337)
313 STORE_NAME 6 (i)
26 316 LOAD_NAME 8 (tmp)
319 LOAD_NAME 6 (i)
322 BINARY_SUBSCR
323 LOAD_CONST 17 (51)
326 BINARY_XOR
327 LOAD_NAME 8 (tmp)
330 LOAD_NAME 6 (i)
333 STORE_SUBSCR
334 JUMP_ABSOLUTE 310
>> 337 POP_BLOCK
28 >> 338 SETUP_LOOP 38 (to 379)
341 LOAD_NAME 4 (range)
344 LOAD_NAME 1 (a)
347 CALL_FUNCTION 1
350 GET_ITER
>> 351 FOR_ITER 24 (to 378)
354 STORE_NAME 6 (i)
29 357 LOAD_NAME 8 (tmp)
360 LOAD_NAME 6 (i)
363 BINARY_SUBSCR
364 LOAD_CONST 18 (8)
367 BINARY_ADD
368 LOAD_NAME 8 (tmp)
371 LOAD_NAME 6 (i)
374 STORE_SUBSCR
375 JUMP_ABSOLUTE 351
>> 378 POP_BLOCK
31 >> 379 LOAD_NAME 8 (tmp)
382 LOAD_NAME 1 (a)
385 LOAD_CONST 10 (3)
388 BINARY_SUBTRACT
389 BINARY_SUBSCR
390 STORE_NAME 11 (tmp1)
32 393 LOAD_NAME 8 (tmp)
396 LOAD_NAME 1 (a)
399 LOAD_CONST 8 (2)
402 BINARY_SUBTRACT
403 BINARY_SUBSCR
404 STORE_NAME 12 (tmp2)
33 407 LOAD_NAME 8 (tmp)
410 LOAD_NAME 1 (a)
413 LOAD_CONST 3 (1)
416 BINARY_SUBTRACT
417 BINARY_SUBSCR
418 STORE_NAME 13 (tmp3)
35 421 SETUP_LOOP 58 (to 482)
424 LOAD_NAME 4 (range)
427 LOAD_NAME 1 (a)
430 LOAD_CONST 10 (3)
433 BINARY_SUBTRACT
434 CALL_FUNCTION 1
437 GET_ITER
>> 438 FOR_ITER 40 (to 481)
441 STORE_NAME 6 (i)
36 444 LOAD_NAME 8 (tmp)
447 LOAD_NAME 1 (a)
450 LOAD_CONST 3 (1)
453 BINARY_SUBTRACT
454 LOAD_NAME 6 (i)
457 BINARY_SUBTRACT
458 LOAD_CONST 10 (3)
461 BINARY_SUBTRACT
462 BINARY_SUBSCR
463 LOAD_NAME 8 (tmp)
466 LOAD_NAME 1 (a)
469 LOAD_CONST 3 (1)
472 BINARY_SUBTRACT
473 LOAD_NAME 6 (i)
476 BINARY_SUBTRACT
477 STORE_SUBSCR
478 JUMP_ABSOLUTE 438
>> 481 POP_BLOCK
38 >> 482 LOAD_NAME 13 (tmp3)
485 LOAD_NAME 8 (tmp)
488 LOAD_CONST 2 (0)
491 STORE_SUBSCR
39 492 LOAD_NAME 12 (tmp2)
495 LOAD_NAME 8 (tmp)
498 LOAD_CONST 3 (1)
501 STORE_SUBSCR
40 502 LOAD_NAME 11 (tmp1)
505 LOAD_NAME 8 (tmp)
508 LOAD_CONST 8 (2)
511 STORE_SUBSCR
42 512 SETUP_LOOP 58 (to 573)
515 LOAD_NAME 4 (range)
518 LOAD_NAME 1 (a)
521 CALL_FUNCTION 1
524 GET_ITER
>> 525 FOR_ITER 44 (to 572)
528 STORE_NAME 6 (i)
43 531 LOAD_NAME 6 (i)
534 LOAD_CONST 19 (7)
537 BINARY_MODULO
538 LOAD_CONST 3 (1)
541 COMPARE_OP 2 (==)
544 POP_JUMP_IF_FALSE 553
44 547 JUMP_ABSOLUTE 525
550 JUMP_FORWARD 0 (to 553)
45 >> 553 LOAD_NAME 8 (tmp)
556 LOAD_NAME 6 (i)
559 DUP_TOPX 2
562 BINARY_SUBSCR
563 LOAD_CONST 20 (119)
566 INPLACE_XOR
567 ROT_THREE
568 STORE_SUBSCR
569 JUMP_ABSOLUTE 525
>> 572 POP_BLOCK
48 >> 573 LOAD_NAME 14 (open)
576 LOAD_CONST 21 ('out')
579 LOAD_CONST 22 ('w')
582 CALL_FUNCTION 2
585 SETUP_WITH 26 (to 614)
588 STORE_NAME 15 (f)
49 591 LOAD_NAME 15 (f)
594 LOAD_ATTR 16 (write)
597 LOAD_NAME 17 (str)
600 LOAD_NAME 8 (tmp)
603 CALL_FUNCTION 1
606 CALL_FUNCTION 1
609 POP_TOP
610 POP_BLOCK
611 LOAD_CONST 1 (None)
>> 614 WITH_CLEANUP
615 END_FINALLY
616 LOAD_CONST 1 (None)
619 RETURN_VALUE
第一次接触，我只还原了一点，求全源码。