Python异常信息写日志

xjtuhit

原文地址：http://51reboot.com/python-except-log/  
蛮有用的

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\n''' # 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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