My python code runs a few times but as soon as I close my computer or do something else, it doesn't run again

Question

Running this code a few times presents no issues. Upon attempting to show a friend, it doesn't work. It just hangs after the input. It's worked quite a few times before but never again unfortunately.

I've tried rewriting the code in brackets, rewriting the code to a local directory instead of the Google Drive folder I have and I've even tried rewriting from scratch in regular notepad. All this was tried in case some sort of encoding issue had occured. No such luck. I figure something is wrong with the interpreter but I'm not sure how to remedy the situation.

def bin2dec():
    bin = []
    a = int(input("What number are you converting to binary?: "))
    while a > 0:
        if a % 2 == 0:
            bin.insert(0, 0)
            a = a/2
        elif a % 2 == 1:
            bin.insert(0, 1)
            a = a/2-0.5
    else:
        #repetition
        print("Your binary equivalent is:", bin)
        repeat = input("Would you like to convert another binary number?: ")
        if repeat == "yes":
            bin2dec()

bin2dec()

Answer 1

Oh....welp. It seems the problem was actually that I somehow installed two versions of pythons and I guess they had been interfering with each other. Reason I'm not deleting this Q is because I'm sure I'm not the only one who's made this mistake. However, others have probably made this mistake in an effort to ensure compatibility between versions. Bad idea.