This insertion occurs after a number of imports have already occurred. Specifically, it occurs after the import of site, os, and sitecustomize. This is confusing. It is clear that sys.path should not change unless the user changes it.

I disagree. It is clear that sys.path will change during "bootstrap", e.g. as the result of processing .pth files.

If we want the directory of the script to be sys.path[0], then an absolute path should be inserted.

I think this would be unimplementable in the general case.

If everyone agrees, I will create a patch.

It's not clear to me what this patch would do, so I disagree. Regards, Martin