You need to get the situation formalised as it shouldn't really have got to this point. However, these things happen so you need to explain to your boss that you created these scripts for personal use, but they've "escaped" into wider circulation. Admit (if necessary) that you were at fault for not bringing this to his attention sooner.

At the very least the scripts should be put under source control "just in case" - then at least if you aren't available (for what ever reason) then your co-workers will have access to the scripts.

Then you either need to convince your boss that Python is the way to go for these or accept that you are going to have to re-write them in a supported language. If the cost of documenting the scripts and educating your co-workers in Python is lower than that of the re-write you might even win the argument.

You need to get the situation formalised as it shouldn't really have got to this point. However, these things happen so you need to explain to your boss that you created these scripts for personal use, but they've "escaped" into wider circulation. Admit (if necessary) that you were at fault for not bringing this to his attention sooner.

At the very least the scripts should be put under source control "just in case" - then at least if you aren't available (for what ever reason) your co-workers will have access to the scripts.

Then you either need to convince your boss that Python is the way to go for these or accept that you are going to have to re-write them in a supported language. If the cost of documenting the scripts and educating your co-workers in Python is lower than that of the re-write you might even win the argument.