抛异常找程序执行流程

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我是靠谱客的博主纯真画板，最近开发中收集的这篇文章主要介绍抛异常找程序执行流程，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

如果def do_event_in(self, buf):
        s = traceback.extract_stack()
        print '%s Invoked me!'%s[-2][2]
        log_debug('server in %s' % buf)
        buf.clear()
        self.push()
        return 0没有import traceback

运行结果将显示：NameError: global name 'traceback' is not defined。Python首先在函数f的本地作用域中查找 traceback，查找失败，接着在全局作用域和内置作用域中查找变量i，仍然失败，最终抛出NameError异常。

Traceback (most recent call last):
File "./tcp_server.py", line 139, in <module>
    unit.start()
File "/data/dreamliang/mySvn/sdn_proj/branches/oss/common/poller_timer_unit.py", line 23, in start
    CPollerUnit.process_poller_events(self)
File "/data/dreamliang/mySvn/sdn_proj/branches/oss/common/poller.py", line 207, in process_poller_events
    if epoll_object.input_notify() >= 0:
File "./tcp_server.py", line 95, in input_notify
    ret = server_conn_object.init(server_conn, self)
File "./tcp_server.py", line 29, in init
    return self.push()
File "/data/dreamliang/mySvn/sdn_proj/branches/oss/common/tcp_base_connect.py", line 42, in push
    if self._conn is None: ret = self.create_conn()
File "./tcp_server.py", line 38, in create_conn
    if not self.b_use_oob(): self.input_notify()
File "./tcp_server.py", line 42, in input_notify
    return CTcpBaseConnect.input_notify(self)
File "/data/dreamliang/mySvn/sdn_proj/branches/oss/common/tcp_base_connect.py", line 143, in input_notify
    return self.do_event_in()
File "/data/dreamliang/mySvn/sdn_proj/branches/oss/common/tcp_base_connect.py", line 121, in do_event_in
    ret = self.handle_event_in()
File "/data/dreamliang/mySvn/sdn_proj/branches/oss/common/tcp_base_connect.py", line 111, in handle_event_in
    ret = self._handle.do_event_in(self._in_buf)
File "/data/dreamliang/mySvn/sdn_proj/branches/oss/common/tcp_handle.py", line 136, in do_event_in
    s = traceback.extract_stack()
NameError: global name 'traceback' is not defined