[Tutor] environment variables

[Alan Gauld]

> since user variables override system variables, why we need do
> anything related to python in the system variables? Why not delete 
> the
> value in the system variable and add to it to define the user
> variable?

System variables apply to all users, so if you want every user
of the computer to have the same Python environment put it
in the System list. Any individual who want to add their own
values will have to copy the system value and add their own.

But for most users the system list should suffice.

HTH,

Alan G