Python PIDFile

Python context manager for managing pid files. Example usage:

import pidfile
import time

print('Starting process')
try:
    with pidfile.PIDFile():
        print('Process started')
        time.sleep(30)
except pidfile.AlreadyRunningError:
    print('Already running.')

print('Exiting')

The context manager will take care of verifying the existence of a pid file, check its pid to see if it's alive, check the command line (which should be <something>/<python name>), and if all the conditions are met, rise a pidfile.AlreadyRunningError exception.

PIDFile() defaults to pidfile for the file name, but it's possible to specify another, e.g. PIDFile('foobar.pid').