What is "+="


#1

Don't know if this was introduced before but what does "+=" serve as? I can't seem to figure out its utility and why the tutorial would have it without explaining what it does. It seems to served as a shortcut for total = total + a list. It's just overly confusing and needs clarity.


#2

They kind of skip this explanation, but it seems to just be shorthand of repeating the total in the equation.

For example:
total += prices[item]

is the same thing as saying:

total = total + prices[item]