Allow =+ on lists

The idea is, similar to with ints, you can use =+ instead of base = base +additive. This would make sense becuase you can already do base(list) = base(list) + additive(list) and i works perfectly fine. Just an idea tho.

Did you try += instead?


And be careful it you are doing x =+ y for x and y instances of int and interpreting that executing as working.

What is doing is computing +y, the unary operator + on y, resulting in y and assigning that value to x.

1 Like

There is no =+ operator. =+ means = (ordinary assignment) followed by + (unary +). x =+ y means to compute +y (this will normally be the same thing as y for numeric types, and will normally give an error for non-numeric types), and then assign that to x.

You are thinking of +=. You can use this with both lists and ints. In fact, it is special-cased for lists: it will use the same logic as the extend method, so that the original list is modified - it does not create a copy. This is important:

>>> a = [1]
>>> b = a # both names for the same object
>>> a = a + [2] # now `a` becomes a different list; `b` is unchanged
>>> b
>>> a = [1]
>>> b = a
>>> a += [2] # now that list is modified; `b` is still a name for it, so it is changed
>>> b
[1, 2]