发布于 2014-09-21 14:00:53 | 206 次阅读 | 评论: 0 | 来源: 网友投递
Python编程语言
Python 是一种面向对象、解释型计算机程序设计语言,由Guido van Rossum于1989年底发明,第一个公开发行版发行于1991年。Python语法简洁而清晰,具有丰富和强大的类库。它常被昵称为胶水语言,它能够把用其他语言制作的各种模块(尤其是C/C++)很轻松地联结在一起。
本文主要为大家讲解的是Python中如何捕捉详细异常信息的示例代码,可以获取文件位置、行号、函数、异常信息等内容,感兴趣的同学参考下.
大家在开发的过程中可能时常碰到一个需求,需要把Python的异常信息输出到日志文件中。
网上的办法都不太实用,下面介绍一种实用的,从Python 2.7源码中扣出来的。
废话不说 直接上代码,代码不多,注释比较多而已。
import sys, traceback traceback_template = '''Traceback (most recent call last): File "%(filename)s", line %(lineno)s, in %(name)s %(type)s: %(message)sn''' # Skipping the "actual line" item # Also note: we don't walk all the way through the frame stack in this example # see hg.python.org/cpython/file/8dffb76faacc/Lib/traceback.py#l280 # (Imagine if the 1/0, below, were replaced by a call to test() which did 1/0.) try: 1/0 except: # http://docs.python.org/2/library/sys.html#sys.exc_info exc_type, exc_value, exc_traceback = sys.exc_info() # most recent (if any) by default ''' Reason this _can_ be bad: If an (unhandled) exception happens AFTER this, or if we do not delete the labels on (not much) older versions of Py, the reference we created can linger. traceback.format_exc/print_exc do this very thing, BUT note this creates a temp scope within the function. ''' traceback_details = { 'filename': exc_traceback.tb_frame.f_code.co_filename, 'lineno' : exc_traceback.tb_lineno, 'name' : exc_traceback.tb_frame.f_code.co_name, 'type' : exc_type.__name__, 'message' : exc_value.message, # or see traceback._some_str() } del(exc_type, exc_value, exc_traceback) # So we don't leave our local labels/objects dangling # This still isn't "completely safe", though! # "Best (recommended) practice: replace all exc_type, exc_value, exc_traceback # with sys.exc_info()[0], sys.exc_info()[1], sys.exc_info()[2] ## 修改这里就可以把traceback打到任意地方,或者存储到文件中了 print traceback_template % traceback_details