Serial Communication Loop Back Test on Raspberry Pi with Python

Serial Loop Back on Raspberry Pi is the first Python Experiment every student have to perform on Pi kit, to check Serial is working or not. This tutorial provide step by step instruction to perform Serial Loop back.
import RPi.GPIO as GPIO
import time
import serial
GPIO.setmode(GPIO.BOARD)
GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_UP)
ser=serial.Serial("/dev/ttyS0",9600)

while True:
    ser.write(b"a")
    print("write 1")
    time.sleep(2)
    print("read 1")
    #print("read start")
    received_data=ser.read()
    #print("read end")
    print("read 1\n")
    print(received_data)
Note: To perform this experiment you have to short the GPIO Pin 8 and 10 with wire. Note: In Raspberry Pi configuration you have to enable the Serial Port, Disable the SSH, Disable Serial Console. Note: The read() function wait for one character to arrive at the input. It will wait for one char and the program is hold until one char received. Read More at https://pyserial.readthedocs.io/en/latest/pyserial_api.html More settings on serial port
ser = serial.Serial(
              
               port='/dev/ttyUSB0',
               baudrate = 9600,
               parity=serial.PARITY_NONE,
               stopbits=serial.STOPBITS_ONE,
               bytesize=serial.EIGHTBITS,
               timeout=1
           )
           counter=0
          
      
           while 1:
               x=ser.readline()
               print x
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