Python中捕捉详细异常信息的代码示例

import sys, traceback

traceback_template = '''Traceback (most recent call last):
 File "%(filename)s", line %(lineno)s, in %(name)s
%(type)s: %(message)s
''' # 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