Python logging – determine level number from name

Question

Python logging levels can be registered using logging.addLevelName. Is there a method to obtain the Python logging number from a level name?

Asked By: Casebash

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Source

Answer 1

After you call addLevelName, the resulting level is treated exactly the same as all of the standard ones:

>>> import logging
>>> logging.getLevelName(10)
'DEBUG'
>>> logging.getLevelName('DEBUG')
10
>>> logging.addLevelName(15, 'DEBUGGISH')
>>> logging.getLevelName(15)
'DEBUGGISH'
>>> logging.getLevelName('DEBUGGISH')
15

The fact that getLevelName can map names to numbers as well as numbers to names is not actually documented in Python 2.x, nor does the name give any hint that it should… but a quick look at the source shows why it works.

Answered By: abarnert

Answer 2

If you can deal with a default level, checking the type of the result is a decent workaround.

int_level = logging.getLevelName(string_level)
  if type(int_level) != int:
    int_level = 20 # default to INFO

Answered By: apardoe

Python logging – determine level number from name

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