python 自定义异常类的使用，继承Exception

自定义异常类全部继承自BaseError

import traceback


class BaseError(Exception):
    def __init__(self):
        self.err_msg = ''
        self.err_msg_detail = ''


class RequestParamsError(BaseError):
    def __init__(self, err_msg):
        self.err_msg = {'code': 70011, 'message': '请求参数错误'}
        self.err_msg_detail = "请求参数错误" + err_msg
        Exception.__init__(self, self.err_msg, self.err_msg_detail)


def try_test():
    x = "yuihdjs"
    try:
        y = int(x)
    except Exception as ep:
        raise RequestParamsError(str(ep))


if __name__ == "__main__":
    try:
        try_test()
    except BaseError as err: # 当抛出的异常是“自定义异常”时执行此语句
        print(err.err_msg['message'])
        print(err.err_msg_detail)
        print(str(traceback.format_exc())) # 打印错误发生点
    except Exception as ep:# 当抛出的异常是“非自定义异常”时执行此语句
        print(str(ep))
        print(str(traceback.format_exc()))

执行打印如下：
请求参数错误
请求参数错误invalid literal for int() with base 10: ‘yuihdjs’
Traceback (most recent call last):
File “D:/HtmlWorkSpace/my_test/module/webtest/test.py”, line 25, in try_test
y = int(x)
ValueError: invalid literal for int() with base 10: ‘yuihdjs’

During handling of the above exception, another exception occurred: