Check and receive Serial port in Python (Port check)

When receiving data from Serial in Python, it is necessary to specify SerialPort, but if there is only one Serial and the baud rate is also known

from serial.tools import list_ports
import serial
ports = list_ports.comports()
ser = serial.Serial(ports[0].device,9600,timeout=0.1)

You can open the port as follows.

If this is too violent, you can check the format of the incoming data for all available ports and open the port if you know the serial baud rate and the format of the incoming data. ..

For example, from Arduino connected to a PC regularly at 9600bps

test:data=***

If you receive data like

from datetime import datetime as dt
from serial.tools import list_ports
import serial
import re

#---------------------------
def ReceiveSerial(_ser):
    _dataStr = ""
    if(_ser!=None):
        _data = _ser.readline()
        if(len(_data)>0):
            try:
                tmpDataStr = _data.decode('utf-8') # 'temp,24.5,hum,50.0'
            except:
                pass
            else:
                _dataStr = re.sub(r'\r|\n|','',tmpDataStr)
    return _dataStr
#---------------------------

def ScanUsingSerialPortName(_reg="^", _baudrate = 115200):
    devName = ""
    ckSer = serial.Serial()
    ckSer.baudrate = _baudrate
    ckSer.timeout = 0.1
    ports = list_ports.comports()
    print("find " + str(len(ports))+"ports")
    if len(ports) > 0:
        deviceNames = []
        for info in ports:
            deviceNames.append(info.device)	#Get the name of the port
            isReady = SerialPortCheck(ckSer,info.device,_reg)
            if (isReady):
                devName = info.device
                break;
    return devName

def SerialPortCheck(_serial, _portName, _reg):
    ret = False
    _serial.port = _portName	#Specify port

    try:
        _serial.open()
    except:
        pass
    else:
        print("SerialPortCheck " + _serial.port )
        startDt = dt.now()
        while True:
            #Read one line
            s = ReceiveSerial(_serial)
            if(len(s)>0):
                print(">" + s)
                matchOB = re.match(_reg,s)
                if matchOB:
                    print("match")
                    ret = True
                    break

            tickTime = (dt.now() - startDt).seconds
            if ((_serial.is_open==False) or (tickTime > 3)):
                print("TimeOut" + s)
                break
        _serial.close()
    return ret

#---------------------------

def SetSerial(_serial, _reg="^", _baudrate=115200):
    if((_serial!=None)and(_serial.is_open)):
        _serial.close()
    tmpSer = None
    usingPortName = ScanUsingSerialPortName(_reg,_baudrate)
    if(usingPortName!=""):
        tmpSer = serial.Serial()
        tmpSer.baudrate = _baudrate
        tmpSer.timeout = 0.1
        tmpSer.port = usingPortName	#Specify port

        try:
            tmpSer.open()
        except:
            tmpSer = None
        else:
            print("SetSerialOK")
    return tmpSer
#---------------------------

ser =SetSerial(ser,"^"+"test:data=",9600)

You can identify the port by doing like.