siteshen’s gists

siteshen / cache_with_ttl.py

Created February 26, 2014 05:29

A cache decorator class with time-to-live support.

	import functools
	import time


	def hash_object(obj):
	if isinstance(obj, (tuple, list)):
	return (type(obj), tuple([hash_object(it) for it in obj]))
	elif isinstance(obj, dict):
	return (type(obj), tuple([(k, hash_object(v))
	for (k, v) in obj.iteritems()]))

siteshen / maxsum.go

Created May 24, 2014 01:28

Maximum subarray problem with some recommended testcase in Go.

	package maxsum

	import "math"

	func MaxSum1(v []float64) (maxSofar float64) {
	length := len(v)
	for i := 0; i < length; i++ {
	for j := i; j < length; j++ {
	sum := 0.0
	// sum of [i..j]

siteshen / search.go

Created May 24, 2014 01:31

Binary search algorithm with some recommended testcase in Go.

	package search

	// binary search 1: low ≤ mid < high
	func BinarySearch1(list []int, v int) int {
	low, high := 0, len(list)
	for low < high {
	mid := (high-low)/2 + low
	// low ≤ mid < high
	if list[mid] < v {
	low = mid + 1

siteshen / slack_client.sh

Created January 17, 2015 04:54

Slack client in bash

	#!/bin/bash

	# https://your-team.slack.com/services/new/incoming-webhook
	WEBHOOK_URL=''
	CHANNEL='#dev'
	USERNAME='sentry'
	iCON_URL='https://slack.global.ssl.fastly.net/17635/img/services/sentry_128.png'

	function post_message() {
	payload="{'username': '$USERNAME', 'text': '$AT_USER $1', 'channel': '$CHANNEL', 'icon_url': '$ICON_URL'}"

siteshen / add_column.sql

Created January 23, 2015 06:07

Example of adding default value to column having millions of rows.

	-- ALTER TABLE users ADD COLUMN deleted boolean NOT NULL DEFAULT false;
	ALTER TABLE users ADD COLUMN deleted boolean;
	ALTER TABLE users ALTER COLUMN deleted SET DEFAULT false;
	UPDATE users SET deleted = false WHERE deleted IS NULL;
	ALTER TABLE users ALTER COLUMN deleted SET NOT NULL;

siteshen / pili_client.go

Created April 20, 2015 06:24

Pili client example

siteshen / update_column.sh

Created May 22, 2015 04:18

Example of update value of column with millions of rows.

	#!/bin/bash

	x=0
	while [ $x -lt 5432 ]; do
	prev=$(expr $x \* 1000000)
	next=$(expr $(expr $x + 1) \* 1000000)
	echo $(date +'%Y-%m-%d %H:%M:%S'), $prev, $next
	x=$(expr $x + 1)
	psql -c "UPDATE followships SET is_deleted = false WHERE is_deleted IS NULL and id >= $prev and id <= $next;"
	done

siteshen / calling_code_en.txt

Created August 19, 2015 13:16

List of country calling codes

siteshen / bearychat.py

Created August 24, 2015 06:13

BearyChat python client

	#!/usr/bin/env python2
	# -- coding: utf-8 --
	import json
	import urllib
	import urllib2


	def bearychat(url, text, channel=None, markdown=None, attachments=None):
	payload = {
	'text': text,

siteshen / utils.py

Created August 24, 2015 06:23

Some python util functions && classes

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