pip install pyserial

# coding:utf-8

import serial.tools.list_ports

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

if len(plist) <= 0:
  print("没有发现端口!")
else:
  plist_0 = list(plist[0])
  serialName = plist_0[0]
  serialFd = serial.Serial(serialName, 9600, timeout=60)
  print("可用端口名>", serialFd.name)

# 所发十六进制字符串010591F50000F104
cmd = [0x01, 0x05, 0x91, 0xF5, 0x00, 0x00, 0xF1, 0x04]

Windows下端口为COM*, Ubuntu下为/dev/ttyS0

import serial

class Ser(object):
  def __init__(self):
    # 打开端口
    self.port = serial.Serial(port='COM4', baudrate=9600, bytesize=8, parity='E', stopbits=1, timeout=2)

  # 发送指令的完整流程
  def send_cmd(self, cmd):
    self.port.write(cmd)
    response = self.port.readall()
    response = self.convert_hex(response)
    return response

  # 转成16进制的函数
  def convert_hex(self, string):
    res = []
    result = []
    for item in string:
      res.append(item)
    for i in res:
      result.append(hex(i))
    return result