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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
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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
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废话不说 直接上代码,代码不多,注释比较多而已
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import sys, traceback
traceback_template = '' 'Traceback (most recent call last):
File "%(filename)s" , line %(lineno)s, in %(name)s
%( type )s: %(message)s\n '' ' # 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
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本文转自 xjtuhit 51CTO博客,原文链接:http://blog.51cto.com/51reboot/1560492