There is a way to convert Python to Lisp.
Peter Norvig talked about it.
Should I assume that you already know about ExternalEvaluate  and Wolfram Client Library for Python  and you still want to convert? If so, I guess you will have to write your own interpreter.
You also can type > in your notebook. Example: http://reference.wolfram.com/language/ref/externalevaluationsystem/Python.html
Interesting but with Python 3.8.1 and Mathematica 12.0 only one line of input works.
Yah, I need to write my own interpreter.
Is it hard?