[Python] How to create an if statement with serial data?

How would I write the code so if I recieve 'hello' it runs a function?

import serial


ser = serial.Serial(port='/dev/tty.usbmodem11201',baudrate=9600)

while True:
value= ser.readline()
valueInString=str(value, 'UTF-8')
print(valueInString)

if ser.is_open == hello:
print("Hi")


This is what I saw to do but it did not work. How would I get it to work? Thanks!

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