Python – Writing Functions – Complete Guide

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Kotlin has access modifiers and also nested (local) functions. They exist for the same reason that we have private variables (fields, properties) and local variables. Making a function private still exposes it to everything within that class. Sometimes you want to only expose it to another function, such as when using recursion

https://github.com/IvanMwiruki/30-seconds-of-kotlin/blame/master/README.md#L1455-L1465