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One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

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Using strace and lsof to debug blocked processes

You can use strace on a specific pid to figure out what a specific process is doing, e.g.:

strace -fp <pid>

You might see something like:

select(9, [3 5 8], [], [], {0, 999999}) = 0 (Timeout)

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#!/usr/bin/env python

# Archive old Maildir type messages
# Wu Jiang (wu@morediff.info)

import argparse
from datetime import timedelta
import mailbox
import time

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#!/usr/bin/env python

import argparse

from wordnik import *


parser = argparse.ArgumentParser()
parser.add_argument("word", help="word to look for")
parser.add_argument("--example", "-i", action="store_true",

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;; Surround option words with quotes
;; It's helpful for making javascript work with IE.
;; i.e.:
;;
;; title: {
;;     text: "highcharts example"
;; },
;; exporting: {
;;     enabled: false
;; },

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;;; auto-rsync-mode -- minor mode for auto rsync
;;
;; Author: @l3msh0
;;

;;; Example
;;
;; (require 'auto-rsync)
;; (auto-rsync-mode t)
;; (setq auto-rsync-dir-alist

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#       $OpenBSD: pf.conf,v 1.54 2014/08/23 05:49:42 deraadt Exp $
#
# See pf.conf(5) and /etc/examples/pf.conf

set skip on lo

block return    # block stateless traffic
pass            # establish keep-state

# By default, do not permit remote connections to X11

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(core)~ $ ifconfig -A
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 32768
        priority: 0
        groups: lo
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x5
        inet6 ::1 prefixlen 128
        inet 127.0.0.1 netmask 0xff000000
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:0c:29:81:a7:db
        priority: 0

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~ $ ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 32768
        priority: 0
        groups: lo
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
        inet6 ::1 prefixlen 128
        inet 127.0.0.1 netmask 0xff000000
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:0c:29:81:a7:db
        priority: 0

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class mapNode(object):
    def __init__(self):
        self.num = None
        self.e = None
        self.w = None
        self.n = None
        self.s = None
        self.lock = None

def main():