Introducing Pynecone, A Full-Stack Python Web Framework

Pynecone is a comprehensive Python web framework that simplifies web app development from front-end to back-end and deployment. To get started, simply ensure you have Python 3.7+ and Node.js 12.22.0+ installed on your system, then use the pip command to install Pynecone:

$ pip install pynecone

Create a new project folder, initialize a new Pynecone project, and run the development web server using the provided commands:

$ mkdir pynecode01
$ cd pynecode01
$ pc init
$ pc run

Pynecone’s development server features live reloading capabilities, streamlining the development process.

The framework offers a wide range of components that can be easily implemented and customized to suit your web application needs. In this tutorial, a sample Pynecone todo application is demonstrated. Start by deleting the default code inside pynecode01.py and adding the following import statement:

import pynecone as pc

Implement the application’s state by creating a State class that inherits from pc.State:

class State(pc.State):
    items = ["Learn Python", "Learn Pynecone", "Have Fun"]
    new_item: str

    def add_item(self):
        self.items += [self.new_item]
        self.new_item = ""

    def finish_item(self, item):
        self.items = [i for i in self.items if i != item]

Next, implement the render_item function to generate a single todo item:

def render_item(item):
    return pc.list_item(
        pc.hstack(
            pc.text(item, font_size="1.5em"),
            pc.button(
                "X",
                color_scheme="red",
                size="sm",
                on_click=lambda: State.finish_item(item),
            ),
            justify_content="space-between",
        )
    )

Create the todo_list function that generates the remaining parts of the UI:

def todo_list():
    return pc.container(
        pc.vstack(
            pc.heading("Todos"),
            pc.input(
                on_blur=State.set_new_item,
                placeholder="Add a todo...",
                bg="white",
            ),
            pc.button("Add", on_click=State.add_item, bg="green", color="white"),
            pc.divider(),
            pc.ordered_list(
                pc.foreach(State.items, lambda item: render_item(item)),
            ),
            bg="#ededed",
            margin="5em",
            padding="1em",
            border_radius="0.5em",
            shadow="lg",
        )
    )

Finally, create the application instance, add the routes, and initiate the compilation of the Pynecone web app:

app = pc.App(state=State)
app.add_page(todo_list, path="/")
app.compile()

In conclusion, Pynecone simplifies the process of building and deploying web apps with Python. Its full-stack framework caters to both beginners and experienced developers, making it an ideal choice for leveraging the power and simplicity of Python in web development. Give Pynecone a try and enhance your web app creations with ease.