python 上下文处理错误，记录日志

之前发过了装饰器版本的异常记录日志，但是需要装饰在函数或方法上。此篇用上下文管理，用一个with就能记录错误了，不需要写成函数。

import traceback
# pip install multiprocessing_log_manager
from multiprocessing_log_manager import LogManager


class ExceptionContextManager():
    """
    用上下文管理器捕获异常，可对代码片段进行错误捕捉，比装饰器更细腻
    """

    def __init__(self, logger_name='ExceptionContextManager', verbose=100, donot_raise__exception=True, ):
        """
        :param _verbose: 打印错误的深度,对应traceback对象的limit，为正整数
        :param donot_raise__exception:是否不重新抛出错误，为Fasle则抛出，为True则不抛出
        """
        self.logger = LogManager(logger_name).get_logger_and_add_handlers()
        self._verbose = verbose
        self._donot_raise__exception = donot_raise__exception

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        # print(exc_val)
        # print(traceback.format_exc())
        exc_str = str(exc_type) + '  :  ' + str(exc_val)
        exc_str_color = '33[0;30;45m%s33[0m' % exc_str
        if self._donot_raise__exception:
            self.logger.error('
'.join(traceback.format_tb(exc_tb)[:self._verbose]) + exc_str_color)
        return self._donot_raise__exception  # __exit__方法必须retuen True才会不重新抛出错误


if __name__ == '__main__':
    def f1():
        1 + '2'


    def f2():
        f1()


    def f3():
        f2()


    def f4():
        f3()


    def run():
        f4()

    with ExceptionContextManager() as ec:
        run()
　　print('finish')

计算整形和字符串相加，运行结果是这样：

 可以传verbose参数来控制记录错误的深度，默认写了100