absolute minimal changes for better code portability

[pmp-p]

can workaround numpy or _pydecimal missing ( can be usefull on android, linux dev boards and wasm). can start embedded ( like in web browsers )

https://pmp-p.ddns.net/paste/screen/shot-2022-07-20_1658353180.png

also ideally trailing spaces should be removed, and black ( https://github.com/psf/black ) formatting applied to facilitate contributions.