Recommendations about release convention or standard for Python scripts?
One could consider to package the scripts. Depending on the distribution, e.g. ubuntu, windows, centos one could create a ppa, nuget or rpm respectively. Once a newer version is installed, the package manager will remove the previous version automatically.

As yum or zypper could be used to install packages on OpenSuse one could consider to create an rpm by using either spec files or using fpm.