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I have a question on how to configure my python logger. Below you can see my current set up of the logger. (http://docs.python.org/2/howto/logging-cookbook.html)

logger = logging.getLogger("someName") logger.setLevel(logging.DEBUG) fh = logging.FileHandler("./log/log.out", "w") fh.setLevel(logging.DEBUG) ch = logging.StreamHandler(sys.stderr) ch.setLevel(logging.ERROR) frm = logging.Formatter('%(asctime)s,%(msecs)d %(name)s %(levelname)s %(message)s','H:%M:%S') fh.setFormatter(frm) ch.setFormatter(frm) logger.addHandler(fh) logger.addHandler(ch)

Is there a way to configure the logger in such a way that it also writes error messages like the one below:

print a >>> NameError: global name 'a' is not defined

Thanks a lot for your help.

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1 Answer 1

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Wrap your code in a try:, except Exception: block and call logger.exception():

try: print a except Exception: logger.exception('Oops, something went wrong')

You could add a raise statement to that to re-raise the caught exception.

Demo:

>>> import logging >>> logging.basicConfig() >>> logger = logging.getLogger() >>> def foo(): ... print a ... >>> def bar(i=0): ... if i < 3: ... bar(i + 1) ... else: ... foo() ... >>> def baz(): ... try: ... bar() ... except Exception: ... logger.exception('Oops, something went wrong') ... >>> def spam(): baz() ... >>> spam() ERROR:root:Oops, something went wrong Traceback (most recent call last): File "<stdin>", line 3, in baz File "<stdin>", line 3, in bar File "<stdin>", line 3, in bar File "<stdin>", line 3, in bar File "<stdin>", line 5, in bar File "<stdin>", line 2, in foo NameError: global name 'a' is not defined

The traceback was logged by the logging module, not by my interactive Python session.

The traceback leads from the try block to the exception; the spam() function is the above example is not included.

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9 Comments

I think this is not what I want, since I dont get a hint were the bug really is. In my orignial code the error message in the console is to long, to see it entirely, so I think this is not what I am looking for.
@swot: The full traceback is logged to your logfile. My sample exception is rather short, what makes you think this is a truncated traceback?
Actually, if I have def somefunction(): print a I didnt get the full traceback in my log file. Any suggestions?
@swot: Where did you catch the exception? At the entry point of your program or inside somefunction()?
create logger </br> somefuntion() </br> try:somefunction </br> except Exception: </br> logger.exception("oops) This is the way I set it up. Does this help?
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