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#!/usr/bin/env python

"""
urlnorm.py - URL normalisation routines

urlnorm normalises a URL by;
  * lowercasing the scheme and hostname
  * taking out default port if present (e.g., http://www.foo.com:80/)
  * collapsing the path (./, ../, etc)
  * removing the last character in the hostname if it is '.'

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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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/*
This example uses Scala.  Please see the MLlib documentation for a Java example.

Try running this code in the Spark shell.  It may produce different topics each time (since LDA includes some randomization), but it should give topics similar to those listed above.

This example is paired with a blog post on LDA in Spark: http://databricks.com/blog
Spark: http://spark.apache.org/
*/

import scala.collection.mutable

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"""
    Demo of json_required decorator for API input validation/error handling
"""

import inspect
import functools
import json
from traceback import format_exception
from flask import jsonify, request
import sys

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Transforming Code into Beautiful, Idiomatic Python

Notes from Raymond Hettinger's talk at pycon US 2013 video, slides.

The code examples and direct quotes are all from Raymond's talk. I've reproduced them here for my own edification and the hopes that others will find them as handy as I have!

Looping over a range of numbers

for i in [0, 1, 2, 3, 4, 5]:

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from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Integer, Column
from postgresql_json import JSON
Base = declarative_base()

class Document(Base):
    id = Column(Integer(), primary_key=True)
    data = Column(JSON)

#do whatever other work

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# -*- coding: utf-8 -*-
 
import unicodedata

""" Normalise (normalize) unicode data in Python to remove umlauts, accents etc. """

data = u'naïve café'
normal = unicodedata.normalize('NFKD', data).encode('ASCII', 'ignore')
print normal
 

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Launch Sublime Text 2 from the Mac OS X Terminal

Sublime Text 2 ships with a CLI called subl (why not "sublime", go figure). This utility is hidden in the following folder (assuming you installed Sublime in /Applications like normal folk. If this following line opens Sublime Text for you, then bingo, you're ready.

open /Applications/Sublime\ Text\ 2.app/Contents/SharedSupport/bin/subl

You can find more (official) details about subl here: http://www.sublimetext.com/docs/2/osx_command_line.html

Installation

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#!/usr/bin/python2
import serial
import re, sys, signal, os, time, datetime
import RPi.GPIO as GPIO

BITRATE = 9600
GPIO.setmode(GPIO.BOARD)
GPIO.setup(7, GPIO.OUT)
GPIO.setup(3, GPIO.IN, pull_up_down=GPIO.PUD_UP)

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# Idempotent way to build a /etc/hosts file with Ansible using your Ansible hosts inventory for a source.
# Will include all hosts the playbook is run on.
# Inspired from http://xmeblog.blogspot.com/2013/06/ansible-dynamicaly-update-etchosts.html

- name: "Build hosts file"
  lineinfile: dest=/etc/hosts regexp='.*{{ item }}$' line="{{ hostvars[item].ansible_default_ipv4.address }} {{item}}" state=present
  when: hostvars[item].ansible_default_ipv4.address is defined
  with_items: groups['all']