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30 Days of Python: Cheat Sheet

A quick reference guide for using the Python Programming language.

Strings

text = "Some string, with some stuff."

text2 = "Yet, another string here."

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import os
import requests
import shutil
import time
from bs4 import BeautifulSoup
from selenium import webdriver

url = "http://www.chrisburkard.com/"
# web_r = requests.get(url)
# web_soup = BeautifulSoup(web_r.content, "lxml")

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#!/bin/zsh
# pyenv install for CentOS 6.5 x86_64 

yum install -y  gcc gcc-c++ make git patch openssl-devel zlib-devel readline-devel sqlite-devel bzip2-devel

git clone git://github.com/yyuu/pyenv.git ~/.pyenv

export PATH="$HOME/.pyenv/bin:$PATH"
eval "$(pyenv init -)"

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# 0 is too far from ` ;)
set -g base-index 1

# Automatically set window title
set-window-option -g automatic-rename on
set-option -g set-titles on

#set -g default-terminal screen-256color
set -g status-keys vi
set -g history-limit 10000

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setup-aws-ubuntu-16.04

sudo apt-get update

Locale

Add below to /etc/environment

LC_CTYPE="en_US.UTF-8"
LC_ALL="en_US.UTF-8"

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#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Python 3 and compatibility with Python 2
from __future__ import unicode_literals, print_function	

import os
import sys
import re
import logging

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import logging
import pytz

TIMEZONE = 'Asia/Hong_Kong'
def posix2local(timestamp, tz=pytz.timezone(TIMEZONE)):
    """Seconds since the epoch -> local time as an aware datetime object."""
    return datetime.fromtimestamp(timestamp, tz)

class Formatter(logging.Formatter):
    def converter(self, timestamp):

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To add en_US.UTF-8 to the list of usable locales:

• Debian, interactive: dpkg-reconfigure locales
• Debian, automated: sed -i 's/^# *\(en_US.UTF-8\)/\1/' /etc/locale.gen && locale-gen
• Ubuntu, automated: locale-gen en_US.UTF-8

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Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

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import requests

import asyncio
import time

urls = [
    "www.baidu.com",
    "www.sina.com",
    "www.google.com.hk",
    "www.sohu.com"