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Pygtail reads log file lines that have not been read. It will even handle log files that have been rotated. Based on logcheck's logtail2 (http://logcheck.org)
Python Shell
Branch: master

README.md

pygtail

A python "port" of logcheck's logtail2.

Pygtail reads log file lines that have not been read. It will even handle log files that have been rotated.

Usage

From the command line:

Usage: pygtail.py [options] logfile

Print log file lines that have not been read.

Options:
  -h, --help            show this help message and exit
  -o OFFSET_FILE, --offset-file=OFFSET_FILE
                        File to which offset data is written (default:
                        <logfile>.offset).
  -p, --paranoid        Update the offset file every time we read a line
                        (as opposed to only when we reach the end of the
                        file).
  --no-copytruncate     Don't support copytruncate-style log rotation.
                        Instead, if the log file shrinks, print a warning.

In your code:

from pygtail import Pygtail

for line in Pygtail("some.log"):
    sys.stdout.write(line)

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