Colin Dunklau cdunklau

cdunklau / .py

Created March 4, 2020 21:25

Alternative constructors with @classmethod

	import requests

	class QuotesAPIClient:
	def __init__(self, baseurl, session):
	self._baseurl = baseurl
	self._session = session

	@classmethod
	def default(cls, api_token):
	session = requests.Session()

cdunklau / composed_lineonlyreceiver.py

Last active February 5, 2020 08:30

A reimplementation of Twisted's LineOnlyReceiver with an explicit parser

	import collections

	from twisted.internet import protocol


	class LineParser(object):
	def __init__(self, delimiter, max_length):
	self.delimiter = delimiter
	self.max_length = max_length
	self._buffer = b''

cdunklau / metaclass-fields.py

Last active June 16, 2017 09:59

Type-checking declarative attributes via metaclass shenanigans

	import six


	class TypedField(object):
	def __init__(self, classinfo):
	self._classinfo = classinfo
	self.fieldname = None # Set by the metaclass

	def __get__(self, instance, owner):
	try:

cdunklau / Procfile

Created March 3, 2017 11:03

A Dynamic DNS service using the GoDaddy API, set up to run on Heroku

web: twistd -n web -p $PORT --class=miscserver.resource

cdunklau / coroutine_limiter.py

Last active October 19, 2017 23:41

Constrain number of simultanous HTTP requests with asyncio

	import asyncio
	import itertools

	import aiohttp
	import async_timeout


	async def fetch_with_response_delay(session, delay):
	if not 0 <= delay <= 10:
	raise ValueError('Delay must be between 0 and 10 inclusive')

cdunklau / foo.py

Last active January 13, 2017 10:28

SQLite3 Injection demonstration

	import sqlite3


	conn = sqlite3.connect(':memory:')
	conn.execute('CREATE TABLE user (user_id INTEGER PRIMARY KEY, name TEXT)')
	conn.commit()

	cursor = conn.cursor()
	for name in ['alice', 'bob', 'carol', 'david']:
	cursor.execute('INSERT INTO user (name) VALUES (?)', (name,))

cdunklau / dicegames.py

Last active February 9, 2017 10:22

Dependancy injection demonstration for making random stuff deterministic

	import random


	def default_diceroller():
	return random.randint(1, 6)


	class CrapsGame(object):
	_diceroller = default_diceroller

cdunklau / gist:042f5aa227c4d312dd89

Created February 21, 2016 19:57

	# Original
	def process_item(self, item, spider):
	try:
	with self.conn:
	query = 'INSERT INTO articles VALUES (?, ?, ?, ?, ?,(CURRENT_TIMESTAMP))'
	try:
	args = (item['url'], item['title'], item['intro'], item['body'], item['publication_date'])
	except KeyError as kerr:
	if kerr.args[0] == 'intro':
	args = (item['url'], item['title'], "", item['body'], item['publication_date'])

cdunklau / reqs.py

Last active September 12, 2015 16:00

Basic url processor

	import sys
	import itertools
	import datetime

	from twisted.internet import task, defer
	from twisted.python import log
	import treq


	def main(reactor, urls, chunksize):

cdunklau / functionized.py

Last active August 29, 2015 14:20 — forked from anonymous/gist:4aef3dfcf966a7fb246e