^=, -= and += symbols in Python

Question

I am quite experienced with Python, but recently, when I was looking at the solutions for the codility sample tests I encountered the operators -=, +=,

Answer 1

As almost any modern language, python has Assignment Operators so they can use them every time you want to assign a value to a variable after doing some arithmetic or logical operation, both (assignment and operation)are expressed compact way in one statement....