Put Serial data to list

[PA3040]

The value send from arduino is 10x12
the data coming to the python slell is b'10x12\r\n'
Dear I need to decode the carriage return from the data coming from Arduino Serial port . So I decode it
Therefore I used

arduino = serial.Serial('COM15',9600)
arduino_data = arduino.readline()
print(arduino_data)

// the value is from arduino_data

 b'10x12\r\n'// the result is showing in python shell

after decode the arduino_data

values = str(arduino_data[0:len(arduino_data)].decode("utf-8"))
print(values)

10x12 / the result is showing in the python shell

// The print of "value" is 10x12 after decode that is what I need
//Then I split it by x to found 10 and 12 because x is my data separator

list_values = values.split('x')
print(list_values)

After split the list_value is ['10', '12\r\n']

It is come back \r\n to the second value '12\r\n']
Please advice
---------------------------
full code

ist_values = []
value = []
import serial
arduino = serial.Serial('COM15',9600)
arduino_data = arduino.readline()
print(arduino_data)
values = str(arduino_data[0:len(arduino_data)].decode("utf-8"))
print(values)
list_values = values.split('x')
print(list_values)
value_1 = (list_values[0:2])
value_2 = (list_values[0:1])
print(value_1)
print(value_2)