Googletrans is a free and unlimited Python library that implemented the
Google Translate API.  This uses the Google Translate Ajax API to make calls to
such methods as detect and translate.

Features:

* Fast and reliable - it uses the same servers that translate.google.com uses
* Auto language detection
* Bulk translations
* Customizable service URL
* HTTP/2 support

WWW: https://github.com/ssut/py-googletrans