Eric (Ergang) Zhu eric-zhu

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]:

Until last night I lived in fear of tildes, carats, resets and reverts in Git. I cargo culted, I destroyed, I laid waste the tidy indicies, branches and trees Git so diligently tried to maintain. Then Zach Holman gave a talk at Paperless Post. It was about Git secrets. He didn't directly cover these topics but he gave an example that made me realize it was time to learn.

A better undo

Generally, when I push out bad code, I panic, hit git reset --hard HEAD^, push and clean up the pieces later. I don't even really know what most of that means. Notational Velocity seems to be fond of it ... in that I just keep copying it from Notational Velocity and pasting it. Turns out, this is dumb. I've irreversibly lost the faulty changes I made. I'll probably even make the same mistakes again. It's like torching your house to get rid of some mice.

Enter Holman. He suggests a better default undo. git reset --soft HEAD^. Says it stag

	import asyncio
	import aiohttp
	import bs4
	import tqdm


	@asyncio.coroutine
	def get(args, *kwargs):
	response = yield from aiohttp.request('GET', args, *kwargs)
	return (yield from response.read_and_close(decode=True))

	import asyncio

	@asyncio.coroutine
	def open_file(name):
	print("opening {}".format(name))
	return open(name)

	@asyncio.coroutine
	def close_file(file):
	print("closing {}".format(file.name))

	#!/usr/bin/env python
	"""
	Very simple HTTP server in python.

	Usage::
	./dummy-web-server.py [<port>]

	Send a GET request::
	curl http://localhost

	require 'formula'

	class Vim < Formula
	homepage 'http://www.vim.org/'
	url 'ftp://ftp.vim.org/pub/vim/unix/vim-7.3.tar.bz2'
	head 'https://vim.googlecode.com/hg/'
	sha256 '5c5d5d6e07f1bbc49b6fe3906ff8a7e39b049928b68195b38e3e3d347100221d'
	version '7.3.682'

	def features; %w(tiny small normal big huge) end

	#!/bin/sh
	# Just copy and paste the lines below (all at once, it won't work line by line!)
	# MAKE SURE YOU ARE HAPPY WITH WHAT IT DOES FIRST! THERE IS NO WARRANTY!

	function abort {
	echo "$1"
	exit 1
	}

	set -e

	#NOTE: .pydistutils.cfg seems to be not compatible with brew install python
	#areas I needed to clean before installation
	#clean up ~/Library/Python
	#clean up .local
	brew install python --framework
	sudo easy_install pip
	pip install virtualenv
	sudo pip install virtualenvwrapper
	mkdir $HOME/.virtualenvs