Python异常信息写日志

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

 1 import sys, traceback
 2 
 3 traceback_template = '''Traceback (most recent call last):
 4   File "%(filename)s", line %(lineno)s, in %(name)s
 5 %(type)s: %(message)s
''' # Skipping the "actual line" item
 6 
 7 # Also note: we don't walk all the way through the frame stack in this example
 8 # see hg.python.org/cpython/file/8dffb76faacc/Lib/traceback.py#l280
 9 # (Imagine if the 1/0, below, were replaced by a call to test() which did 1/0.)
10 
11 try:
12     1/0
13 except:
14     # http://docs.python.org/2/library/sys.html#sys.exc_info
15     exc_type, exc_value, exc_traceback = sys.exc_info() # most recent (if any) by default
16 
17     '''
18     Reason this _can_ be bad: If an (unhandled) exception happens AFTER this,
19     or if we do not delete the labels on (not much) older versions of Py, the
20     reference we created can linger.
21 
22     traceback.format_exc/print_exc do this very thing, BUT note this creates a
23     temp scope within the function.
24     '''
25 
26     traceback_details = {
27                          'filename': exc_traceback.tb_frame.f_code.co_filename,
28                          'lineno'  : exc_traceback.tb_lineno,
29                          'name'    : exc_traceback.tb_frame.f_code.co_name,
30                          'type'    : exc_type.__name__,
31                          'message' : exc_value.message, # or see traceback._some_str()
32                         }
33 
34     del(exc_type, exc_value, exc_traceback) # So we don't leave our local labels/objects dangling
35     # This still isn't "completely safe", though!
36     # "Best (recommended) practice: replace all exc_type, exc_value, exc_traceback
37     # with sys.exc_info()[0], sys.exc_info()[1], sys.exc_info()[2]
38 
39 
40     ## 修改这里就可以把traceback打到任意地方，或者存储到文件中了
41     print traceback_template % traceback_details

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