What does += mean in Python?

Question

I see code like this for example in Python:

    if cnt > 0 and len(aStr) > 1:
        while cnt > 0:                  
            aStr = aStr[1:]+a         


        

Answer 1

FYI: it looks like you might have an infinite loop in your example...

if cnt > 0 and len(aStr) > 1:
    while cnt > 0:                  
        aStr = aStr[1:]+aStr[0]
        cnt += 1

• a condition of entering the loop is that cnt is greater than 0
• the loop continues to run as long as cnt is greater than 0
• each iteration of the loop increments cnt by 1

The net result is that cnt will always be greater than 0 and the loop will never exit.