Run Python in WebAssembly with Pyodide
In recent years, WebAssembly (Wasm) has emerged as a powerful tool for running languages like Python in the browser. Pyodide, an open-source project, allows developers to execute Python code in WebAssembly, opening up new possibilities for web development. In this tutorial, we will guide you on using Pyodide to run Python code in WebAssembly and create a simple application to calculate the square of a number.
Before starting, ensure you have a modern web browser supporting WebAssembly. Most modern browsers like Google Chrome, Mozilla Firefox, and Microsoft Edge support WebAssembly.
Table of Contents
- Setting Up Pyodide
- Creating the User Interface
- Loading and Running Python Code
- Assembling the Pieces
Setting Up Pyodide
To begin, create a new HTML file named
index.html and add the following content:
This code sets up the necessary HTML structure and imports the Pyodide library.
Creating the User Interface
Next, add a user interface to the
body of the HTML file for user input and displaying the result:
Loading and Running Python Code
Now, let’s define a Python function for calculating the square of a number using Pyodide:
This code initializes Pyodide and defines a Python function named
This above code attaches an event listener to the “Calculate” button, gets the number from the input field, and calls the
square function from Python. The result is then displayed in a paragraph element.
Assembling the Pieces
After putting all the pieces together, we have an
index.html file containing all the code we discussed previously.
Experiment with Pyodide and WebAssembly to explore new ways of building web applications, and consider how these technologies can enhance your development process.
If you’re interested in further exploring the world of web development and cloud technologies, I invite you to read our previous articles. Start with our “Friendly Introduction to WebAssembly”, which provides an easy-to-understand overview of this powerful technology. For those looking to dive deeper into specific WASM technologies, check out our hands-on tutorial on Golang WebAssembly. These articles cover the basics and provide practical code examples to enhance your understanding and help you start your journey toward mastering web development and cloud technologies.
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