Oleg Molchanov zaemiel

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()

Python using virtualenv and pip

With every project you write in python, you will have different libraries that you lean on. Some projects might use the same library, but different versions. For this reason, the Python library virtualenv was created. To enable a developer to quickly create new environments.

Every virtualenv instance comes with pip installed, which is a package manager for python. This allows you to do install packages like so.

pip install django

Installing Virtualenv

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

	import json
	import os
	import requests

	from copy import copy


	# To run try this out, run --> `python coroutines.py`

	import asyncio
	loop = asyncio.get_event_loop()

	async def hello():
	await asyncio.sleep(3)
	print('Hello!')

	if __name__ == '__main__':
	loop.run_until_complete(hello())

	from flask import Flask, session, request
	from flask_sqlalchemy import SQLAlchemy

	import flask_admin as admin
	from flask_admin.contrib import sqla
	from flask_admin import expose

	# Create application
	app = Flask(__name__)

	# 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

	# code to take a PDF and scrape address information. Note that this particular script will
	# only work using the specific PDF formatting my PDF had so you can use as a guide but
	# it will definitely not work on your PDF!


	from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter
	from pdfminer.converter import HTMLConverter
	from pdfminer.converter import TextConverter
	from pdfminer.layout import LAParams
	from pdfminer.pdfpage import PDFPage

	<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>

	*.pyc
	*.jpe
	*.png