sloria

The Best of the Best Practices (BOBP) Guide for Python

A "Best of the Best Practices" (BOBP) guide to developing in Python.

In General

Values

• "Build tools for others that you want to be built for you." - Kenneth Reitz
• "Simplicity is alway better than functionality." - Pieter Hintjens

jonathanmoore

Share Counts

I have always struggled with getting all the various share buttons from Facebook, Twitter, Google Plus, Pinterest, etc to align correctly and to not look like a tacky explosion of buttons. Seeing a number of sites rolling their own share buttons with counts, for example The Next Web I decided to look into the various APIs on how to simply return the share count.

If you want to roll up all of these into a single jQuery plugin check out Sharrre

Many of these API calls and methods are undocumented, so anticipate that they will change in the future. Also, if you are planning on rolling these out across a site I would recommend creating a simple endpoint that periodically caches results from all of the APIs so that you are not overloading the services will requests.

Twitter

miguelgrinberg

import asyncio
loop = asyncio.get_event_loop()

async def hello():
    await asyncio.sleep(3)
    print('Hello!')
    
if __name__ == '__main__':
    loop.run_until_complete(hello())
    

nuxlli

Sublime Text 2 - Useful Shortcuts

Tested in Mac OS X: super == command

Open/Goto

---

• super+t: go to file
• super+ctrl+p: go to project
• super+r: go to methods

MicahElliott

#! /usr/bin/env python

""" Convert values between RGB hex codes and xterm-256 color codes.

Nice long listing of all 256 colors and their codes. Useful for
developing console color themes, or even script output schemes.

Resources:
* http://en.wikipedia.org/wiki/8-bit_color
* http://en.wikipedia.org/wiki/ANSI_escape_code

skyuplam

# Example of combining Flask-Security and Flask-Admin.
# by Steve Saporta
# April 15, 2014
#
# Uses Flask-Security to control access to the application, with "admin" and "end-user" roles.
# Uses Flask-Admin to provide an admin UI for the lists of users and roles.
# SQLAlchemy ORM, Flask-Mail and WTForms are used in supporting roles, as well.

from flask import Flask, render_template
from flask.ext.sqlalchemy import SQLAlchemy

christianroman

import cv2.cv as cv
import tesseract
gray = cv.LoadImage('captcha.jpeg', cv.CV_LOAD_IMAGE_GRAYSCALE)
cv.Threshold(gray, gray, 231, 255, cv.CV_THRESH_BINARY)
api = tesseract.TessBaseAPI()
api.Init(".","eng",tesseract.OEM_DEFAULT)
api.SetVariable("tessedit_char_whitelist", "0123456789abcdefghijklmnopqrstuvwxyz")
api.SetPageSegMode(tesseract.PSM_SINGLE_WORD)
tesseract.SetCvImage(gray,api)
print api.GetUTF8Text()

akella

<snippet>
	<content><![CDATA[
<!-- begin $1 -->
<div class="$1">
	$2
</div>
<!-- end $1 -->
]]></content>
	<!-- Optional: Set a tabTrigger to define how to trigger the snippet -->
	<tabTrigger>di</tabTrigger>

lbolla

Asynchronous programming with Tornado

Asynchronous programming can be tricky for beginners, therefore I think it's useful to iron some basic concepts to avoid common pitfalls.

For an explanation about generic asynchronous programming, I recommend you one of the [many][2] [resources][3] [online][4].

I will focus on solely on asynchronous programming in [Tornado][1]. From Tornado's homepage:

dvmn-tasks

Исключения умеют всплывать

Исключения в Python — это особый объект, который умеет путешествовать между функциями и менять их поведение. Своим появлением исключение прерывает обычное исполнение программы — сверху вниз и вглубь — и переводит его в особый обратный режим — наверх до подходящего try except finally.

Для примера рассмотрим программу — информер с прогнозом погоды. Функция request_weather делает запрос к API сайта weather.com и возвращает прогноз погоды:

def request_weather():
    response = requests.get('https://weather.com/api/weather/moscow/')
    return response.json()