python-logging
How to insert newline in python logging?
I have two solutions, the first is very easy, but the output is not very clean. The second method will produce the exact output you want, but it is a little more involved. Method 1 To produce a blank line, just log an empty string with a new line: import logging logging.basicConfig(level=logging.DEBUG, format=”%(asctime)s %(levelname)s %(message)s”, … Read more
logging setLevel, how it works
It’s there for fine-tuning (you can have multiple handlers, and each could have different levels set) — you can safely not set level on the handler, which will cause it to process all messages (a.k.a. NOTSET level), and leave level filtering to the logger. Logger is also the first to filter the message based on … Read more
Naming Python loggers
I typically don’t use or find a need for class-level loggers, but I keep my modules at a few classes at most. A simple: import logging LOG = logging.getLogger(__name__) At the top of the module and subsequent: LOG.info(‘Spam and eggs are tasty!’) from anywhere in the file typically gets me to where I want to … Read more
redirect prints to log file
Python lets you capture and assign sys.stdout – as mentioned – to do this: import sys old_stdout = sys.stdout log_file = open(“message.log”,”w”) sys.stdout = log_file print “this will be written to message.log” sys.stdout = old_stdout log_file.close()
Why are both “import logging” and “import logging.config” needed?
logging is a package. Modules in packages aren’t imported until you (or something in your program) imports them. You don’t need both import logging and import logging.config though: just import logging.config will make the name logging available already.
What is Python’s default logging formatter?
The default format is located here which is: BASIC_FORMAT = “%(levelname)s:%(name)s:%(message)s” The Format code will tell you how you can customize it. Here is one example on how you can customize it. import sys import logging logging.basicConfig( level=logging.DEBUG, format=”[%(asctime)s] %(levelname)s [%(name)s.%(funcName)s:%(lineno)d] %(message)s”, datefmt=”%d/%b/%Y %H:%M:%S”, stream=sys.stdout) logging.info(“HEY”) Which results in: [26/May/2013 06:41:40] INFO [root.<module>:1] HEY
How do I get logger to delete existing log file before writing to it again?
Try this: filehandler_dbg = logging.FileHandler( logger.name + ‘-debug.log’, mode=”w”) to open the filename in write mode instead of append mode, clobbering logger.name More information: logging.FileHandler docs, open() and list of modes
Python logging – check location of log files?
The logging module uses handlers attached to loggers to decide how, where, or even if messages ultimately get stored or displayed. You can configure logging by default to write to a file as well. You should really read the docs, but if you call logging.basicConfig(filename=log_file_name) where log_file_name is the name of the file you want … Read more