Hardcoded use of python command

[ProgrammingGamer]

I noticed that there is a hardcoded use of the python command in code, where this should really be based on the user's python command as entered in UI. This can cause issues on systems that use a different version of python by default, for example MacOS and some linux distros will use python for python 2.7 and python3 for python 3+.

This occurs at line 360 and 364 of PythonSession.java.