Should the shebang (#!) contain -s and/or -P?

[cfxegbert]

Should each of the rez scripts attempt to keep a cleaner environment? There are a couple of python command line flags that could be added to the shebang line that would keep it cleaner.

• -s - Don't add the user site-packages directory to sys.path. The user site-package directory is in the users home directory. The directory path is different based on the platform. This directory is a site directory, which means that .pth files in it will be processed. This could easily add other python libraries into the rez python environment and could be different for each user.
• -P - Don’t prepend a potentially unsafe path to sys.path. In the case of rez that would be the directory where the rez python scripts are installed. This was added in Python 3.11. An install time check to see if the python interpreter supports the -P flag would be if hasattr(sys.flags, 'safe_path')