It is necessary to send a string number to the Arduino uno. After working with c#, c++, I don’t understand what python sends to the port. I looked at an example of work from the official website, decided to adapt it to my needs, it does not work, — Arduino does not send data back. I began to gradually remove the lines and change the methods. I found a problem.
The code works fine if you send a string number via input, but if you enter it directly, nothing works. And then my understanding dropped.

I’m trying to send lots of float data from python to arduino. But when I check the values, some of them are wrong.

I’m trying to send lots of float data from python to arduino. But when I check the values, some of them are wrong.