Pyserial problem with Arduino - works with the Python shell but not in a program

Question

All right, so I am positive my Arduino circuit is correct and the code for it. I know this because when I use the serial monitor built into the Arduino IDE and send \'H\' an

Answer 1

Just to make it a bit more clear I'll modify the code so everyone can see what needs to be added!

import serial
import time
ser = serial.Serial("COM4",9600)
time.sleep(3)
ser.write("H")

Adding in a sleep statment helps to let the serial open up without any problems!