Java's jps in Python using Twitter Commons

jps.py

import os
import glob
import twitter.common.java.perfdata as twc

if __name__ == '__main__':

    pattern = os.path.join('/tmp', 'hsperfdata_*', '*')
    for path in glob.glob(pattern):
        root, pid = os.path.split(path)
        dirname = os.path.basename(root)
        role = dirname[len('hsperfdata_'):]
        def loader():
            with open(path, 'rb') as fp:
                return fp.read()

        perfdata = twc.PerfData.get(loader)
        perfdata.sample()
        print role, int(pid), perfdata['sun.rt.javaCommand']