Trouble with serial communication between Arduino and python

Projects Interfacing w/ Software on the Computer
3

try the following Python to receive the serial data

import serial
import time

serialPort = serial.Serial(
    port="COM3", baudrate=9600, bytesize=8, timeout=2, stopbits=serial.STOPBITS_ONE
)
serialString = ""  # Used to hold data coming over UART
while 1:
    # Wait until there is data waiting in the serial buffer
    if serialPort.in_waiting > 0:

        # Read data out of the buffer until a carraige return / new line is found
        serialString = serialPort.readline()

        # Print the contents of the serial data
        try:
            print(serialString.decode("Ascii"))
        except:
            pass

also have a look at two-ways-communication-between-python3-and-arduino