silviud

CSS Selectors Cheatsheet

Element selectors

Element -- selects all h2 elements on the page

h2 {
    foo: bar;

Working with ansible-vault

I've been using a lot of Ansible lately and while almost everything has been great, finding a clean way to implement ansible-vault wasn't immediately apparent.

What I decided on was the following: put your secret information into a vars file, reference that vars file from your task, and encrypt the whole vars file using ansible-vault encrypt.

Let's use an example: You're writing an Ansible role and want to encrypt the spoiler for the movie Aliens.

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

	# Windows Performance Counters plugin.
	# These are the recommended method of monitoring system metrics on windows,
	# as the regular system plugins (inputs.cpu, inputs.mem, etc.) rely on WMI,
	# which utilize more system resources.
	#
	# See more configuration examples at:
	# https://github.com/influxdata/telegraf/tree/master/plugins/inputs/win_perf_counters
	# If metrics are missing run `lodctr /r` as Administrator

	[[inputs.win_perf_counters]]

	# -- coding: utf-8 --
	"""
	pg_uuid
	~~~~~~~~~~~~~~~~

	<NO DESCRIPTION>.

	:copyright: (c) 2018 by WRDLL <[email protected]>
	"""
	from flask import Flask

	// class
	class ClassCar {
	drive () {
	console.log('Vroom!');
	}
	}

	const car1 = new ClassCar();
	console.log(car1.drive());

	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>