I wanna to store R G B from a color sensor but i get it in one column R G B R G B ....... order , so i try to use dataframe method to store R G B value in different column but i get error

[Rock8090]

import serial
import datetime
import time
import csv
import pandas as pd
ser= serial.Serial(port="COM5",baudrate=9600,timeout=20)
SCREEN_DISPLAY = True
SAVE_TO_FILE= True
DELIMITER=','
file_name = 'Sensor_data_3_1_1.csv'
fid=open(file_name,'ab')
filename="Sensor_data_3_1_1.csv"
for i in range(100):
b = ser.readline()
string_n = b.decode()
time_now=time.strftime("%Y-%m-%d %H: %M:%S")
DELIMITER=','
Data=(string_n,DELIMITER,time_now)
df = pd.DataFrame({Data})

        df[['Found Sensor ', 'R', 'G','B']] = df[Data].str.split(',', expand=True)
        print(df)
        with open("Sensor_data_3_1_1.csv","a") as f:
            writer = csv.writer(f,delimiter=",")
            writer.writerow([Data,time_now])

fid.close()
ser.close()