deff():foriinrange(5):ifi>3:print(i)

  1           0 RESUME                   0  2           2 LOAD_GLOBAL              1 (NULL + range)             14 LOAD_CONST               1 (5)             16 CALL                     1             26 GET_ITER        >>   28 FOR_ITER                21 (to 72)             30 STORE_FAST               0 (i)  3          32 LOAD_FAST                0 (i)             34 LOAD_CONST               2 (3)             36 COMPARE_OP               4 (>)             42 POP_JUMP_FORWARD_IF_FALSE    13 (to 70)     <--------- could be BACKWARD to 28  4          44 LOAD_GLOBAL              3 (NULL + print)             56 LOAD_FAST                0 (i)             58 CALL                     1             68 POP_TOP        >>   70 JUMP_BACKWARD           22 (to 28)  2     >>   72 LOAD_CONST               0 (None)             74 RETURN_VALUE

 static bool jump_thread(struct instr *inst, struct instr *target, int opcode) {     assert(!IS_VIRTUAL_OPCODE(opcode) || IS_VIRTUAL_JUMP_OPCODE(opcode));     assert(is_jump(inst));     assert(is_jump(target));     // bpo-45773: If inst->i_target == target->i_target, then nothing actually     // changes (and we fall into an infinite loop):-    if (inst->i_lineno == target->i_lineno &&+    if ((inst->i_lineno == target->i_lineno || target->i_lineno == -1) &&         inst->i_target != target->i_target)     {         inst->i_target = target->i_target;         inst->i_opcode = opcode;         return true;     }     return false; }