A simple Google-style logging wrapper for Python.
This library attempts to greatly simplify logging in Python applications. Nobody wants to spend hours pouring over the PEP 282 logger documentation, and almost nobody actually needs things like loggers that can be reconfigured over the network. We just want to get on with writing our apps.
Styled somewhat after the twitter.common.log interface, which in turn was modeled after Google's internal python logger, which was never actually released to the wild, and which in turn was based on the C++ glog module.
- You and your code don't need to care about how logging works. Unless you want to, of course.
- No more complicated setup boilerplate!
- Your apps and scripts will all have a consistent log format, and the same predictable behaviours.
This library configures the root logger, so nearly everything you import that uses the standard Python logging module will play along nicely.
- Messages are always written to stderr.
- Lines are prefixed with a google-style log prefix, of the form
E0924 22:19:15.123456 19552 filename.py:87] Log message blah blah
Splitting on spaces, the fields are:
- The first character is the log level, followed by MMDD (month, day)
- HH:MM:SS.microseconds
- Process ID
- basename_of_sourcefile.py:linenumber]
- The body of the log message.
import glog as log
log.info("It works.")
log.warn("Something not ideal")
log.error("Something went wrong")
log.fatal("AAAAAAAAAAAAAAA!")If your app uses gflags, it will automatically gain a --verbosity flag. In order for that flag to be effective, you must call log.init() after parsing flags, like so:
import sys
import gflags
import glog as log
FLAGS = gflags.FLAGS
def main(_):
log.debug('warble garble %s', FLAGS.verbosity)
if __name__ == '__main__':
posargs = FLAGS(sys.argv)
log.init()
main(posargs[1:])Happy logging!