Python Closures: Coming from JavaScript

📰 Dev.to · David Moran

Learn how Python closures work and how they differ from JavaScript closures, with a focus on practical examples and code comparisons.

intermediate Published 20 Jan 2026
Action Steps
  1. Read about Python closures and their syntax using the `def` keyword and nested functions.
  2. Compare and contrast Python closures with JavaScript closures, focusing on differences in scope and variable binding.
  3. Build a simple Python closure using a nested function that accesses variables from the outer scope.
  4. Test the closure by calling it and verifying that it returns the expected result.
  5. Apply Python closures to a real-world problem, such as creating a higher-order function that returns another function.
  6. Configure and run a Python script that demonstrates the use of closures in a practical context.
Who Needs to Know This

Developers familiar with JavaScript who are transitioning to Python will benefit from understanding how closures work in Python, and how to apply them in their code. This knowledge will help them to write more efficient and effective Python programs.

Key Insight

💡 Python closures are functions that have access to their own scope and can capture variables from the outer scope, similar to JavaScript closures, but with some key differences in syntax and behavior.

Share This
🐍💡 Learn how Python closures differ from JavaScript closures and how to use them in your Python code! #python #javascript #closures

Key Takeaways

Learn how Python closures work and how they differ from JavaScript closures, with a focus on practical examples and code comparisons.

Full Article

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