1、在执行serial.tools.list_ports.comports()函数时，只导入import serial

import serial
# import serial.tools.list_ports
class UDSCommunication:
    def __init__(self):
        self.ports = serial.tools.list_ports.comports()
        self.wanted_description="USB Serial Port"
        self.port_t = None


    def strat(self,port):
        self.ser = serial.Serial(port, 9600, 8, "E", timeout=50, stopbits=1)


    def Find_Com(self):

        for p in self.ports:
            if self.wanted_description in p.description:
                self.port_t = p.device
                break


    def close_connection(self):
        self.ser.close()


if __name__ == "__main__":
    uds_communication = UDSCommunication()
    uds_communication.Find_Com()
    print(uds_communication.port_t)
    uds_communication.strat(uds_communication.port_t)

运行报错

Traceback (most recent call last):
  File "C:\Users\Thinkpad\Desktop\Read_Com\LonHand_Class.py", line 27, in <module>
    uds_communication = UDSCommunication()
  File "C:\Users\Thinkpad\Desktop\Read_Com\LonHand_Class.py", line 5, in __init__
    self.ports = serial.tools.list_ports.comports()
AttributeError: module 'serial' has no attribute 'tools'

Process finished with exit code 1

追究原因是该调用的对象在serial目录下面还有一层tool目录，

C:\Users\Thinkpad\AppData\Local\Programs\Python\Python39\Lib\site-packages\serial\tools

2、正确的操作

import serial
import serial.tools.list_ports
class UDSCommunication:
    def __init__(self):
        self.ports = serial.tools.list_ports.comports()
        self.wanted_description="USB Serial Port"
        self.port_t = None


    def strat(self,port):
        self.ser = serial.Serial(port, 9600, 8, "E", timeout=50, stopbits=1)


    def Find_Com(self):

        for p in self.ports:
            if self.wanted_description in p.description:
                self.port_t = p.device
                break


    def close_connection(self):
        self.ser.close()


if __name__ == "__main__":
    uds_communication = UDSCommunication()
    uds_communication.Find_Com()
    print(uds_communication.port_t)
    uds_communication.strat(uds_communication.port_t)

运行结果

C:\Users\Thinkpad\AppData\Local\Programs\Python\Python39\python.exe C:/Users/Thinkpad/Desktop/Read_Com/LonHand_Class.py 
COM8

Process finished with exit code 0