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I'm currently trying to right align the logging level field in my Python logger so that output such as:
[2011-10-14 13:47:51] [DEBUG] --- starting... (smtphandlers.py:96) [2011-10-14 13:47:51] [INFO] --- first things first... (smtphandlers.py:97) [2011-10-14 13:47:51] [WARNING] --- about to end... (smtphandlers.py:98) [2011-10-14 13:47:51] [DEBUG] --- ending (smtphandlers.py:99) instead looks like:
[2011-10-14 13:47:51] [ DEBUG] --- starting... (smtphandlers.py:96) [2011-10-14 13:47:51] [ INFO] --- first things first... (smtphandlers.py:97) [2011-10-14 13:47:51] [ WARNING] --- about to end... (smtphandlers.py:98) [2011-10-14 13:47:51] [ DEBUG] --- ending (smtphandlers.py:99) The format line for the first block is:
logging.Formatter("[%(asctime)s] [%(levelname)s] --- %(message)s (%(filename)s:%(lineno)s)", "%Y-%m-%d %H:%M:%S") If I know the max level length is 8 (eg: CRITICAL), then I'll right align to 8 spaces. I'm trying to figure out how to achieve this. The following fails because "%(levelname)s" is more than 8 characters (the substitution doesn't happen until later). If I use something like "{0:>20}".format"%(levelname)s", then it works, but that is more padding than I need or want.
logging.Formatter("[%(asctime)s] [" + "{0:>8}".format"%(levelname)s" + "] --- %(message)s (%(filename)s:%(lineno)s)", "%Y-%m-%d %H:%M:%S") Short of subclassing Formatter, anyone have a way to achieve this?
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You can use the :> , :< or :^ option in the f-format to left align, right align or center align the text that you want to format. We can use the fortmat() string function in python to output the desired text in the order we want.
Note: If you want to right justify the string, use ljust().
Python Logging Levels There are six log levels in Python; each level is associated with an integer that indicates the log severity: NOTSET=0, DEBUG=10, INFO=20, WARN=30, ERROR=40, and CRITICAL=50. All the levels are rather straightforward (DEBUG < INFO < WARN ) except NOTSET, whose particularity will be addressed next.
Like this:
logging.Formatter("[%(asctime)s] [%(levelname)8s] --- %(message)s (%(filename)s:%(lineno)s)", "%Y-%m-%d %H:%M:%S") Try with this format line :
logging.Formatter("[%(asctime)s] [%(levelname)8s] --- %(message)s (%(filename)s:%(lineno)s)", "%Y-%m-%d %H:%M:%S") python logger formatter use the standard python string formatting rules
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