Lesson 37 of 55
9 mins readModules, Namespaces & Exports
In Plain English
Modules encapsulate code into independent global namespaces. Learn to define modules, export public APIs with export, and consume functionality with using and import.
Deep Dive: How It Works
module Definition: module Geometry export circle_area; circle_area(r) = π*r^2 end.
using vs import: using brings exported symbols directly into the current namespace; import requires explicit module prefixing or allows adding new methods to imported functions.
Submodules: Modules can be nested hierarchically inside other modules.
Core Rules to Remember
Namespace Isolation: Prevent global variable collisions across large software architectures.
Explicit export API: Control exactly which functions and types are exposed to callers.
Live Interactive Example
Hit Run Code to see it liveDefining and Consuming a Custom Module
Python 3.12
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Output Console
Click "Run Code" to view the rendered output.
How it works: using .StatisticsHelper brought mean_val and variance_val into scope.
Your Turn: Micro Challenge
No pressure! Edit the starter code below and test your solution with instant feedback.
Micro Exercise
Define MathModule and Export Double
- Define a module `MathModule` that exports `double_val(x) = 2x`.
- Load it with `using .MathModule`.
- Print `"Double 21: $(double_val(21))"`.
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Sandbox Output
Click "Run & Check" to test your solution.
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