this post was submitted on 02 Sep 2025
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Python

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Python Mutability (programming.dev)
submitted 4 months ago by bterwijn@programming.dev to c/python@programming.dev
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[–] shape_warrior_t@programming.dev 7 points 4 months ago (2 children)

The fact that x += y modifies lists in place might be surprising if you're expecting it to be exactly equivalent to x = x + y.

[–] bterwijn@programming.dev 3 points 4 months ago

Yes, that is a surprise to many, in other languages 'x+=y' and 'x=x+y' are the same.

[–] sukhmel@programming.dev 2 points 4 months ago

To be fair, I had to read the linked question on SO to understand what was the possible alternative. I do expect that if I use += it is in place.

On the other hand with Python and Java I always keep forgetting if everything is by value or by reference, I really miss some extra clarity of the languages where you can see if something is mutable when passed to a function