Why does my program not output anything in the command window when I run it?

So I defined a function for bubble sorting but when I try to run it I just get a blank console window. I feel like its something really stupid like a syntax error but I can't pin it down. Here is the code:

def bubble(arr):
swap = True 
while (swap == True):
    swap = False
    for i in range(len(arr)-1):
        temp = arr[i]
        if arr[i]> arr[i+1]:
            temp = arr[i+1]
            arr[1] = arr[i+1]
    swap = True

array = ["AB","AAB","AAA"]
print (bubble(array))
input()

Solution

Here is a bubble function that will more likely work.

def bubble(arr):
    swap = True
    while (swap == True):
        swap = False
        for i in range(len(arr)-1):
            if arr[i]> arr[i+1]:
                arr[i], arr[i+1] = arr[i+1], arr[i]
                swap = True
    return arr

There are various issues in your original bubble function.

Your function does not return anything, so print(bubble(array)) will always output None
Your second swap = True statement was ill-placed, and was executed at each step of your while loop, resulting in infinite loop
you wrote arr[1] = arr[i+1] instead of arr[i] = arr[i+1], and forgot the second part of swapping. In python, you can swap two values without the need of a temp variable, which is what I've done.