import 正确调用方式

https://stackoverflow.com/questions/54288475/pyserial-module-serial-has-no-attribute-tools

Wrong way to import , correct it like below:

from serial.tools import list_ports

x = list(list_ports.comports())
print(x)

or

import serial.tools.list_ports

plist = list(serial.tools.list_ports.comports())
print(plist)