kamailio-python-modules software package provides contains the app_python module, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install kamailio-python-modules
kamailio-python-modules is installed in your system.
Make ensure the kamailio-python-modules package were installed using the commands given below,
$ sudo dpkg-query -l | grep kamailio-python-modules *
You will get with kamailio-python-modules package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Network |
| Package | kamailio-python-modules |
| Version | 4.2.0-2+deb8u2 |
| Description | contains the app_python module |
| Sub Section | Net |