python中如何通过报错信息定位问题（异常传播轨迹）

class SelfException(Exception):
    pass

def main():
    firstMethod()

def firstMethod():
    secondMethod()

def secondMethod():
    thirdMethod()

def thirdMethod():
    raise SelfException("自定义异常信息")

main()

#输出结果：
D:\soft\python36\python.exe D:/myproject/crazy_python/07/7.4/traceback_test.py
Traceback (most recent call last):
  File "D:/myproject/crazy_python/07/7.4/traceback_test.py", line 24, in <module>
    main()
  File "D:/myproject/crazy_python/07/7.4/traceback_test.py", line 9, in main
    firstMethod()
  File "D:/myproject/crazy_python/07/7.4/traceback_test.py", line 13, in firstMethod
    secondMethod()
  File "D:/myproject/crazy_python/07/7.4/traceback_test.py", line 17, in secondMethod
    thirdMethod()
  File "D:/myproject/crazy_python/07/7.4/traceback_test.py", line 21, in thirdMethod
    raise SelfException("自定义异常信息")
__main__.SelfException: 自定义异常信息

那么如何通过报错信息定位问题？

最后一行信息详细显示了异常的类型和异常的详细信息。从这一行往上，逐个记录了异常发生源头、异常依次传播所经过的轨迹，并表明异常发生在哪个文件、哪一行、哪个函数处。一般在大量的报错信息中找出属于自己写的代码去定位问题