Scope

Where in a program a name can be used - names made inside a function are local to it, so functions can't trip over each other's names.

Depth 1 · Foundation

You know that a function's names and parameters exist only during its call, that the same name inside and outside a function are two different names, why assigning to a global inside a function gives UnboundLocalError, and how to pass values in and return them instead.

Depths of understanding

1
Foundation
You know that a function's names and parameters exist only during its call, that the same name inside and outside a function are two different names, why assigning to a global inside a function gives UnboundLocalError, and how to pass values in and return them instead.
Opens after
Return valuesThe way to get a value out of a function's local names is to return it, so return comes first.

Your path here

What's still between you and Scope, depth 1, in the order you can learn it.

Where it fits

Builds on

Return values

This concept

ScopeFunctions

Opens up

Decomposition

Builds onThis conceptOpens upReturn values ScopeFunctions Decomposition

Makes these deeper

Once you know Scope, come back to these — they'll mean more.

First-class functionsDepth 2A closure is a function that keeps the local names of the function it was made in, so you need to know how local names work first.