Why += and not append?

I was wondering why to use scoops_sold += element and not use scoops_sold.append(element)? I noticed .append does not work, but wonder why, as it should add a single element to a predefined list.

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Welcome, @colinios,

If we examine the initial declarations, scoops_sold is set to zero. It is not a list, but a single numeric value which we will accumulate to reach total.

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