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How does a Python list grow in memory?

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01

Understand the problem

Over-allocation strategy.

listmemory
02

Attempt it yourself

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03

Study the solution

A list stores a resizable array of pointers and over-allocates capacity geometrically, so append is amortized O(1) rather than reallocating every time.

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04

Run the code

PYWatch capacity jump as the list grows
05

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