Functions

BeginnerFoundations

Arguments, scope and the LEGB rule, closures, recursion, first-class and higher-order functions, and the classic gotchas.

20 lessons 4 labs 1 projects ~9h

Prerequisites: Python Fundamentals

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Lessons in this build

Scope & the LEGB Rule

Scope is the region of code where a name is visible, and the LEGB rule (Local, Enclosing, Global, Built-in) is the fixed order Python searches to resolve every name you use.

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Closures

A closure is a function that remembers variables from the scope where it was defined, even after that scope has finished executing.

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Why it matters

Interview importance 5/5 · production importance 4/5.

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Closures