Many applications have the need to send emails programmatically at specific times or regular intervals. In Python this is possible with the use of the Twilio SendGrid API for sending emails as well as Redis Queue and RQ Scheduler. Let's walk through how to schedule an email step by step.

Prerequisites and dependencies

Make sure you have the following before moving on:

• Python 3 installed on your machine
• A free SendGrid account
• An email address to test out this project

Here is a guide you can follow for setting up your development environment if you are going to be doing more web development with Python in general and are unfamiliar with things like virtual environments.

Before writing code, you'll need to install some dependencies:

• The SendGrid Python library for sending emails
• RQ Scheduler - a lightweight, elegant solution built on top of another tool with a low barrier …

Twilio SendGrid eliminates many of the complexities of sending email. In a previous tutorial, you learned how to use SendGrid’s SMTP server to send emails to your users from a Python and Flask application. But how do you schedule your emails so that they are sent at a specific time?

In this short tutorial you will learn how to use SendGrid’s email scheduling options, which will save you from having to implement your own background scheduling.

Requirements

To work on this tutorial you will need the following items:

• Python 3.6 or newer. If your operating system does not provide a Python 3.6+ interpreter, you can go to python.org to download an installer.
• A free Twilio SendGrid account. If you are new to Twilio Sendgrid you can create a trial account. With a trial account you can send 100 emails per day forever.

Create a Flask project

Find an …

Put on your fedora and dark glasses, because you’re about to become a Cold War-era numbers station operator!

What is a numbers station, I hear you ask? A numbers station is a radio station in the shortwave frequency band that periodically reads out a sequence of numbers, popularly believed to be a secret code for intelligence officers listening for encrypted information. Numbers stations appeared during World War I and are likely to have become much more prevalent during the Cold War.

In the past, the numbers were often spoken in what sounded like a creepy voice, probably due to the poor radio transmission quality available at the time. You can listen to a few recent examples of numbers station transmissions on the Crypto Museum's website. Some numbers stations survive to this very day.

Since many people enjoy cracking secret codes, I thought it would be fun to show you …

In this tutorial, we are going to learn how to build an application with Python and FFmpeg that will allow us to turn voice recordings into cool videos that can be easily shared on social media.

At the end of the tutorial we will have turned a voice recording into a video that looks similar to the following:

Tutorial requirements

To follow this tutorial you are going to need the following components:

• One or more voice recordings that you want to convert to videos. Programmable Voice recordings stored in your Twilio account work great for this tutorial.
• Python 3.6+ installed.
• FFmpeg version 4.3.1 or newer installed.

Creating the project structure

In this section, we will create our project directory, and inside this directory, we will create sub-directories where we will store the recordings, images, fonts, and videos that will be used in this tutorial. Lastly, we will create the Python …

米国東部では17年おきにブルードXと呼ばれる種類のセミが、数十億匹も地中から這い出してきます。前回の発生が2004年、そして今年2021年に再び羽化の時期を迎えます。

これらのセミたちが追い付くには多くのことが変化した17年ですが、Pythonプログラミング言語も非常に多くの更新を経てきました。2004年5月にリリースされたPython 2.3.4を調べて、この周期ゼの視点から、現在のPythonでのコーディングと異なる点を確認しましょう。

from may_2004 import newest_python_version

旧バージョンのPythonはpython.orgから引き続き入手可能です。前回周期ゼミが発生した頃のPython 2.3.4も含まれます。

このリリースアーカイブページには、Windowsインストーラーのほか、2つのtarballソースリリースファイルが置かれています。これらのファイルは自ら手動でコンパイルするか、MacPythonで使用することができます。私はMacユーザーですが、利便性から主に仮想マシンでWindowsインストーラーを実行して使用しています。

インストール後、Pythonシェルを開いて好きなコードを実行できます。

Python 2.3.4の新機能

Python 2.3.4には多くの新機能が搭載されていました。いくつ …

When it comes to software development, there are almost always several different ways to achieve the same outcome. This is true when evaluating a family of third-party software packages, too. For example, in the Python ecosystem there are thousands of packages related to making HTTP requests. Which one should you use?

In this experiment-based tutorial, we’ll walk through brief code snippets that show how to make a simple GET request using 5 of Python’s most popular requests-related packages. We’ll use NASA’s Astronomy Photo of the Day API (shortened to APOD throughout the rest of the tutorial) and open today’s photo in our web browser.

Our goal is to make simple GET requests quickly using a variety of Python packages, rather than to compare and contrast all of the features and subtleties of each package. If asynchronous requests are a better fit for your use case, check out the companion …

Asynchroner Code ist zunehmend zu einer tragenden Säule der Python-Entwicklung geworden. Mit asyncio als Teil der Standardbibliothek und vielen Paketen von Drittanbietern, die damit kompatible Funktionen bieten, wird dieses Paradigma nicht so schnell verschwinden.

Wir wollen uns anschauen, wie man die HTTPX-Bibliothek verwendet, um dies für asynchrone HTTP-Anfragen zu nutzen. Das ist einer der häufigsten Anwendungsfälle für nicht blockierenden Code.

Was ist nicht blockierender Code?

Möglicherweise hörst du Begriffe wie „asynchron“, „nicht blockierend“ oder „gleichzeitig“ und bist ein wenig verwirrt darüber, was sie alle bedeuten. Diesem viel detaillierteren Tutorial zufolge gibt es zwei primäre Eigenschaften:

• Asynchrone …

When building a user registration and authentication system for your web application, you run the risk of not properly detecting fake or duplicate accounts. A very effective way to reduce this risk is to require users to verify their accounts right after they register.

In this tutorial I’m going to show you how to extend the Django authentication system to include an SMS verification step in the user registration flow, using the Twilio Verify service. Among other things, you will learn how to:

• Customize the user database model
• Ask for additional information in the user registration page
• Send and check SMS verification codes with the Twilio Verify service
• Prevent access to parts of the application to users that haven’t verified their accounts

Ready to begin? Let’s go!

Prerequisites

To follow this tutorial you need the following items:

• Python 3.6 or newer. If your operating system does not provide a Python …

Pythonアプリケーションを構成する際は、環境変数を使用すると非常に便利です。構成を変更する場合に、ソースコードを編集する必要がなくなります。一般的な構成アイテムのうち、環境変数を使用してアプリケーションに渡すことが多いものとしては、サードパーティのAPIキーやネットワークポート、データベースサーバー、アプリケーションの正常な動作に必要なカスタムオプションなどがあります。

この記事では、Pythonで環境変数を使用するためのテクニックやツールを紹介します。

Pythonから環境変数にアクセスする方法

os.environ辞書を使用する

Pythonでは、os.environ辞書がすべての環境変数を保持しています。アプリケーション内から変数を取得する最も簡単な方法は、標準的な辞書型の構文を使用することです。以下の例は、USERという名前の環境変数にアクセスする方法を示しています。

この方法を使用し、存在しない環境変数をインポートしようとすると、KeyError例外が発生します。

Do you forget to send birthday wishes to your friends and loved ones? I do, and it usually results in being scolded by my fiancée! I’ve often wished for a software program that could send birthday wishes on my behalf.

In this tutorial, we will create this exact end-to-end system. We will use Twilio's What’sApp API for sending the messages, the Flask web framework for the web server, and we will run messaging jobs periodically using APScheduler. We’ll also deploy the Flask application to AWS so it can be deployed resiliently and at scale.

The complete code for this tutorial is available in this Github repository.

Prerequisites

• A Twilio account. (Sign up with this link and receive an additional $10 credit.)
• The WhatsApp application installed on your mobile phone
• An activated WhatsApp Sandbox (be sure to follow the setup instructions).
• Your Account SID and Auth Token, found …