KeyError: 2

[stsxbel]

Good evening, the second day I struggle with the code, then there is no entry in the database, then the error is KeyError: 2

import struct
import sys
import time
import datetime
import pymysql.cursors
from pymodbus.client.sync import ModbusSerialClient
from pymodbus.exceptions import ModbusIOException
from datetime import datetime

connection = pymysql.connect(host='127.0.0.1', user='root', password='passwd', db='scales', charset='utf8mb4', cursorclass=pymysql.cursors.DictCursor)

unit = 5
client = ModbusSerialClient(method='rtu', port='/dev/ttyUSB1', parity='N', baudrate=9600, bytesize=8, stopbits=1, timeout=1, strict=False)


#---------------------------Продукт 1-------------------------
 
while True:
	reply = client.write_registers(52, 1, unit=unit) 
	reply = client.write_registers(53, 1, unit=unit) 
	reply = client.write_registers(5, 2020, unit=unit) #2020 - Total managment
	request = client.read_holding_registers(51, 1, unit=unit)
	result1 = request.registers
	print(result1)

	reply = client.write_registers(52, 2, unit=unit) 
	reply = client.write_registers(53, 1, unit=unit) 
	reply = client.write_registers(5, 2020, unit=unit) #2020 - Total managment
	request = client.read_holding_registers(51, 1, unit=unit)
	result2 = request.registers
	print(result2)

	reply = client.write_registers(52, 3, unit=unit) 
	reply = client.write_registers(53, 1, unit=unit) 
	reply = client.write_registers(5, 2020, unit=unit) #2020 - Total managment
	request = client.read_holding_registers(51, 1, unit=unit)
	result3= request.registers
	print(result3)
	
	reply = client.write_registers(52, 1, unit=unit) 
	reply = client.write_registers(53, 1, unit=unit) 
	reply = client.write_registers(5, 2020, unit=unit) #2020 - Total managment
	request = client.read_holding_registers(51, 1, unit=unit)
	result4 = request.registers
	print(result4)

	reply = client.write_registers(52, 2, unit=unit) 
	reply = client.write_registers(53, 1, unit=unit) 
	reply = client.write_registers(5, 2020, unit=unit) #2020 - Total managment
	request = client.read_holding_registers(51, 1, unit=unit)
	result5 = request.registers
	print(result5)

	reply = client.write_registers(52, 3, unit=unit) 
	reply = client.write_registers(53, 1, unit=unit) 
	reply = client.write_registers(5, 2020, unit=unit) #2020 - Total managment
	request = client.read_holding_registers(51, 1, unit=unit)
	result6= request.registers
	print(result6)
	if (result1 == result4 and result2 == result5 and result3 == result6):
		
		written_as = result1[0] * 0.1, result2[0] * 0.1, result3[0] * 0.1
		print(result1, result2, result3)
	    
#---------Write DB--------------------
		with connection: 
 
			cur = connection.cursor()
			cur.execute("SELECT * FROM wl5 ORDER BY id DESC LIMIT 1")
 
			rows = cur.fetchall()
 
			for row in rows:

			
				print("{0}".format(row[2]))
				print("{0}".format(row[3]))
				print("{0}".format(row[4]))
			
				try:
					a1 =  float(result1[0] * 0.1)
					b1 =  float(row[2]) 
					silos14 = b1 - a1 - bool(b1 > a1) * 6553.5
					print ("Расход:"f'{silos14:.1f}')

					a2 =  float(result2[0] * 0.1)
					b2 =  float(row[3]) 
					silos15 = b2 - a2 - bool(b2 > a2) * 6553.5
					print ("Расход:"f'{silos15:.1f}')

					a3 =  float(result3[0] * 0.1)
					b3 =  float(row[4])
					silos16 = b3 - a3 - bool(b3 > a3) * 6553.5
					print ("Расход:"f'{silos16:.1f}')

				except:
#---------write db result-----
					with connection.cursor() as cursor:
        # Create a new record
						sql = "INSERT INTO `line5` (`date`, `silos14`, silos15, silos16) VALUES (%s, %s, %s, %s)"
						today = datetime.datetime.today()
						newHireDate = today.strftime("%Y-%m-%d-%H.%M")
						cursor.execute(sql, (newHireDate, silos14, silos15, silos16))


#------Write db wl5-------
						sql = "INSERT INTO `wl5` (`date`, `product1`, `product2`, `product3`) VALUES (%s, %s, %s, %s)"
						today = datetime.datetime.today()
						newHireDate = today.strftime("%Y-%m-%d-%H.%M")
						cursor.execute(sql, (newHireDate, result1[0] * 0.1, result2[0] * 0.1,result3[0] * 0.1))

    			connection.commit()

 	
		break

Traceback (most recent call last):
File "/home/pokip/test.py", line 76, in <module>
print("{0}".format(row[2]))
KeyError: 2