Python Data Model: Copying
An exercise to help build the right mental model for Python data. The “Solution” link uses memory_graph to visualize execution and reveals what’s actually happening:
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8 replies
id say B
Nice one, see the "Solution" link for correct answer.
A
Incorrect sorry, check the "Solution" link for the correct answer.
Oh du-duoy. Forgot that list of list is a list of pointers somehow while also remembering a list is a pointer. Thanks.
Nope I spoke too soon. My bad.
Preferred solution: learnyouahaskell.com . For immutable data!
Different languages make different choices. The disadvantage of Haskell is that if you want to change one value in a collection of a million values that it either makes a full copy or tries to optimize by sharing values behind the scene, both resulting in significant overhead. Most people already understand that pure functional programming languages don't deliver except in very specific circumstances: Haskell TIOBE rating 0.32%, https://www.tiobe.com/tiobe-index/