This python script is intended to automate the extraction of embedded certificates and keys from OpenVPN config files.
Unfortunately the GNOME Network-Manager is not able to automatically import OpenVPN config files with embedded certificates and keys. A workaround is to manually extract these and store them in separate files (e.g. see https://naveensnayak.wordpress.com/2013/03/04/ubuntu-openvpn-with-ovpn-file/).
Make shure all the required packages are installed. For example on Ubuntu and Debian run:
$ sudo apt-get install python3 network-manager-openvpn-gnome