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)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