how set/change env var PYTHONOPTIMIZE in Python 3 / 3.7 / 3.8 ????

[lsepolis123]

You can change it like any environment variable in your OS (which is?) That said, why not simply run python with the -O option?

when you say:
That said, why not simply run python with the -O option

What do you mean in Python IDLE or Thonny Python Editor? When running/executing the file.py... how?

Please give an example