vmuriart

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]:

vmuriart

[tox]
envlist=py27,lint

[testenv]
downloadcache={homedir}/.pipcache
distribute=True
sitepackages=False

[testenv:py27]
deps=nose

vmuriart

import sqlite3
import os
import argparse

try:
    import pyspark
    import pyspark.sql
except ImportError:
    import sys
    import os

vmuriart

#!/usr/bin/env python

'''
Send an multipart email with HTML and plain text alternatives. The message
should be constructed as a plain-text file of the following format:
    
    From: Your Name <your@email.com>
    To: Recipient One <recipient@to.com>
    Subject: Your subject line
    ---

vmuriart

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

vmuriart

#!/usr/bin/env python
# coding: utf-8

# You need PIL <http://www.pythonware.com/products/pil/> to run this script
# Download unifont.ttf from <http://unifoundry.com/unifont.html> (or use
# any TTF you have)
# Copyright 2011 Álvaro Justen [alvarojusten at gmail dot com]
# License: GPL <http://www.gnu.org/copyleft/gpl.html>

from image_utils import ImageText

vmuriart

#!/usr/bin/env python
# coding: utf-8

# This little project is hosted at: <https://gist.github.com/1455741>
# Copyright 2011-2012 Álvaro Justen [alvarojusten at gmail dot com]
# License: GPL <http://www.gnu.org/copyleft/gpl.html>

import os
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

vmuriart

"""
Convert Pandas DFs in an HDFStore to parquet files for better compatibility
with Spark.

Run from the command line with:

spark-submit --driver-memory 4g --master 'local[*]' hdf5_to_parquet.py

"""
import pandas as pd

vmuriart

'''
Save this file and add the following line to your ~/.bashrc"

export PYTHONSTARTUP="$HOME/.pythonrc"
'''
import os
import readline
import rlcompleter
import atexit

vmuriart

Anchors in Markdown

To create an anchor to a heading in github flavored markdown. Add - characters between each word in the heading and wrap the value in parens (#some-markdown-heading) so your link should look like so:

[create an anchor](#anchors-in-markdown)