python for in嵌套有限制？

Question

上图是代码，‘发现一个匹配’，并break之后，for line3 in g3.readlines():就再也不执行了。搜索相关问题，有回答说迭代有次数限制的，请教Python大神解答。X_X 下图是运行结果

Answer 1

This way of writing is so strange. Does the file pointer need to be reset?
To open two files, you can do this

with open("1.txt") as IN1, open("2.txt") as IN2:

Answer 2

Problem solved The second for in failed to read g3 in a loop
https://www.zhihu.com/question/45370193?from=profile_question_card