isort software package provides utility for sorting Python imports, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install isort
isort is installed in your system.
Make ensure the isort package were installed using the commands given below,
$ sudo dpkg-query -l | grep isort *
You will get with isort package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Python |
| Package | isort |
| Version | 4.2.5+ds1-2 |
| Description | utility for sorting Python imports |
| Sub Section | Python |