You have probably seen the famous WAT video from Destroy All Software. If you haven’t seen the video, it is a MUST.
As part of a recent StackOverflow letter, I saw that Python should also be part of that presentation. The question is, “what is the difference between i += x
and i = i + x
in Python. It should be the same thing right? Well, not exactly. From the example shown in the answers, when using arrays and i += x
:
a = [1, 2, 3] b = a b += [1, 2, 3] print a #[1, 2, 3, 1, 2, 3] print b #[1, 2, 3, 1, 2, 3]
whereas is you use i = i + x
:
a = [1, 2, 3] b = a b = b + [1, 2, 3] print a #[1, 2, 3] print b #[1, 2, 3, 1, 2, 3]

Here’s the link the original question on stackoverflow. Language designers never stop amazing me.
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