Lesson 15 of 55
15 mins readPython Function Overloading
In Plain English
Function overloading allows a single function name to accept different argument combinations and return distinct types depending on how it was invoked.
Core Rules to Remember
Overload Signatures: Exposes precise type signatures to callers while hiding implementation details.
Single Implementation: The implementation signature must be broad enough to handle all declared overloads.
Live Interactive Example
Hit Run Code to see it liveDeclaring and Implementing Overloads
Python 3.12
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Output Console
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How it works: The caller receives exact types without manual type casting.
Your Turn: Micro Challenge
No pressure! Edit the starter code below and test your solution with instant feedback.
Micro Exercise
Create an Id Lookup Overload
- Declare overload: findItem(id: number): string;
- Declare overload: findItem(slug: string): number;
- Implement findItem(query: number | string): string | number: if query is number return `Item-${query}`, if string return query.length.
- Call findItem(42) and findItem("zen") and print their outputs separated by a space.
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Sandbox Output
Click "Run & Check" to test your solution.
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