Google provides client libraries for Gmail API for several languages, such as Java, JavaScript, .NET, Python, Objective-C, and PHP.

Enable the Gmail API and download the credentials file in JSON format. This file will allow your Python scripts to authenticate and securely interact with your Gmail account.

The new API offers fine-grained access to a Gmail user's account, allowing an app developer to make simple HTTPS calls and get responses in a variety of formats, with OAuth 2.0 authorizing access ...

The new version of Gmail -- which was more of a back-end update -- has given developers access to an easy Greasemonkey API that makes developing plugins or changing the appearance of Gmail a breeze.