silviud

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]:

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

Sublime Text 2 – Useful Shortcuts (PC)

Loosely ordered with the commands I use most towards the top. Sublime also offer full documentation.

Editing

Ctrl+C	copy current line (if no selection)
Ctrl+X	cut current line (if no selection)
Ctrl+⇧+K	delete line
Ctrl+↩	insert line after

Title

<Additional information about your API call. Try to use verbs that match both request type (fetching vs modifying) and plurality (one vs multiple).>

URL

<The URL Structure (path only, no root url)>
Method:


	Base Usage
	ssh [user]@[host]

	Use Specific Key
	ssh -i ~/.ssh/id_rsa [user]@[host]

	Use Alternative Port
	ssh -i ~/.ssh/id_rsa -p [port] [user]@[host]

	from django import forms
	from django.core.exceptions import ValidationError
	from django.db import transaction


	class InvalidInputsError(Exception):

	def __init__(self, errors, non_field_errors):
	self.errors = errors
	self.non_field_errors = non_field_errors

	#!/bin/bash

	### BEGIN INIT INFO
	# Provides: php-fpm
	# Required-Start: $local_fs $remote_fs $network $syslog
	# Required-Stop: $local_fs $remote_fs $network $syslog
	# Default-Start: 2 3 4 5
	# Default-Stop: 0 1 6
	# Short-Description: starts php-fpm daemon
	# Description: starts php-fpm daemon

	// fluentd conf
	<source>
	@type tail
	path /var/log/nginx/access.log #...or where you placed your Apache access log
	pos_file /var/log/td-agent/nginx-access.log.pos # This is where you record file position
	tag nginx.access #fluentd tag!
	format /^(?<remote>[^ ]) (?<host>[^ ]) (?<user>[^ ]) \[(?<time>[^\]])\] "(?<method>\S+)(?: +(?<path>[^\"]) +\S)?" (?<code>[^ ]) (?<size>[^ ])(?: "(?<referer>[^\"])" "(?<agent>[^\"])" "(?<end>)[^\"]*")?$/
	time_format %d/%b/%Y:%H:%M:%S %z
	</source>

	# boto instance tags
	import boto.ec2

	conn = boto.ec2.connect_to_region('us-west-2')
	# Find a specific instance, returns a list of Reservation objects
	# http://boto.cloudhackers.com/en/latest/ref/ec2.html#boto.ec2.connection.EC2Connection.get_all_reservations
	reservations = conn.get_all_instances(instance_ids=['i-xxxxxxxx'])
	# Find the Instance object inside the reservation
	instance = reservations[0].instances[0]
	internal_dns = instance.private_dns_name