How to implement bi-directional communication between Raspberry PI and Arduino in python?

Question

Python

Part of the functionality is implemented on Arduino, a python program, runs on a Raspbury Pi and must receive / send data (integer from 0 to 255) from / to Arduino.
1) Is it possible to connect Arduino and Raspberry Pi via GPIO or just USB?
2)PySerial - can it work with GPIO on Raspbery Pi?
3) Where can I see examples of bidirectional exchange on PySerial or RPIO ( pythonhosted.org/RPIO/)

Answer 1

PySerial won't work with regular GPIO, only UART.
As an option, you can cling to SPI.

Answer 2

To be honest, I didn’t work with Python, but in principle I don’t see any problems - Arduin should be displayed in the system as a COM port, and work with it. Consider text exchange.