Chapter 1: Introduction to PyScript

PyScript is revolutionizing web development by allowing Python code to run directly in browsers. This innovation is set to captivate data scientists, machine learning practitioners, and web developers eager to leverage Python for web applications.

With PyScript, the dream of integrating Python with HTML has finally come true, enabling us to utilize JavaScript libraries seamlessly alongside Python code. This opens up new avenues for creating robust web applications entirely in Python.

In this guide, we will explore:

• The fundamentals of PyScript
• Key features that set it apart
• Essential PyScript tags
• Practical applications of PyScript
• Step-by-step instructions for writing and executing Python code with PyScript
• Illustrative examples of PyScript in action

Writing and Executing Python Code with PyScript

Let’s dive into an example of writing Python code using PyScript. If you're already familiar with Python syntax, this will be straightforward. Below is a sample code snippet that creates a line graph:

import numpy as np

import matplotlib.pyplot as plt

a = np.array([1, 3, 5, 7, 9, 11])

b = np.array([2, 4, 6, 8, 10, 12])

x = np.exp(a)

y = np.exp(b)

plt.plot(a, x, color="blue", marker='*')

plt.plot(b, y, color="red", marker='o')

plt.title("Line Graph")

plt.xlabel("X")

plt.ylabel("Y")

plt.show()

To implement this with PyScript, follow these steps:

1. Open a text editor to create your HTML file.
2. Use the py-env tag to declare the necessary Python packages.
3. Write your Python code within the py-script tag.

Once you've saved your file with an .html extension and opened it in your browser, you should see the resulting line graph displayed.

Here’s a visual representation of what the output looks like when using PyScript:

Exploring More Examples

Let’s consider additional examples to illustrate PyScript’s capabilities.

#### Example 1: A Simple Python Script

In this scenario, we’ll create a file named hello_world.html. Saving it in the same directory as your PyScript JavaScript and CSS files allows for seamless execution. When opened in a browser, you should see:

#### Example 2: Multi-line Python Script

For a more complex example, we can compute the value of π using a multi-line script. This showcases how to handle longer Python code blocks effectively.

#### Example 3: Utilizing Packages

In this final example, we’ll demonstrate how to leverage external packages like NumPy to perform calculations.

Conclusion

PyScript provides a unique opportunity to execute Python code directly in web browsers without the need for a separate installation. Whether you're considering it as a JavaScript alternative or a means to experiment with Python, PyScript opens up exciting possibilities for web development. I'm eager to see the innovative machine learning and data science applications that will emerge from this groundbreaking tool.