How to hand over information to a program organized in C with Python

I'm making a multi-threading program in C language. Python can't do it because it has quite a lot of computation. Most of all, we've implemented all of the key functions.

This C language program needs to put the data in the beginning. There are about 10 intasers and about 100 double variables. Now I read this from the csv file in my computer.

This csv file reads DB in Python and drops it. Yes... I didn't know how to do ODBC or something, so I chose Python because I was lazy -_-;;;;

DB ->Python ->C.

The Python program calls the C program using the OS module, so that process works automatically.

Oh, and the Python program is not just dropping the DB, but it's also acting as a server and always responding to network responses.

The C program drops five computed result-double arrays into the csv file. The Python program reads it and writes it to the DB. Eventually, DB-> Python-> File->C-> File-> Python->DB became a very unreasonable structure;;;;;

This is what I know how to do, so there is a process of unnecessarily writing and reading, rewriting and rereading in the file, what should I do?

How do you get around 100 factors to program C with Python? How can I get the result of program C?

There are only a few results, so I don't know how to transfer the factor even if I just get stdout.

How do you do it?