PySerial

Read from and write to a serial (UART/USB) port from Python.

Easy

import serial

with serial.Serial("COM3", 115200, timeout=1) as port:   # "/dev/ttyUSB0" on Linux
    port.write(b"LED ON\n")
    line = port.readline().decode().strip()
    print(line)

Both sides must use the same baud rate. readline() waits until a newline or the timeout. Use this to log sensor data to CSV, build a test jig, or control a device from a GUI.

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