String error

[BashBedlam]

How are you initializing dataArray ?

arduinoString = '98.6, 89'
dataArray = arduinoString.split(",")
temp = float(dataArray[0])
humid = float(dataArray[1])
print (temp, ",", humid)

This code works because dataArray is an ordinary, run-of-the-mill python list and is not expecting a bytes like object.