If I am typing some Python code in the IDLE, for example a function:

def sayHi(name):
    print('Hello ', name)

and I execute the function:

sayHi('Ed')

I can not edit the function or execute a previous line of code again if I tap the up arrow on my keyboard. It seemed to work in the previous versions of Python. In order to execute a previous line of code I have to either copy it, or type it in again.