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To run a program with custom env settings, we do this on Linux
$ MYVAR=23 ./foo.py
On Windows, the only way I know of is:
C:\> set MYVAR=23
C:\> .\foo.py
C:\> REM unset MYVAR here (but how?)
But can’t this done be as an one-liner?
It should be noted that batch files are parsed one line at the time, so one liners like this are problematic there (setlocal ENABLEDELAYEDEXPANSION can help out in those cases)