(I-=-1)

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21 pointsmarvindanig7 comments

I just learned that Python allows overriding __isub__ separately from __sub__ and the same for __iadd__ [0].

Really interesting!

Thank you. I never thought to consider the possibility of making these be separate. Interesting.

Why was he surprised that it works? -1 is a perfectly normal integer and -= is a perfectly valid operator.

He wasn’t surprised it worked, he was surprised someone used it. At least that’s how I took it.

I think that while people wouldnt be surprised that

i -= -1

works, formatted as

i-=-1

it's unclear what each - is doing, likely someone did it because it looks nice and symmetrical, as opposed to

i+=1

Probably because in js if i="1" then i+=1 results in i="11" but i-=-1 results in i=2