pyweber 1.3.0.dev20260609

A lightweight Python framework for building and managing web applications.

Pyweber Framework

Pyweber is a lightweight Python web framework designed to create dynamic, reactive web applications with a simple and intuitive API. It combines the simplicity of Python with the reactivity of modern frontend frameworks.

Key Features

• Reactive Templates: Create dynamic UIs that automatically update when data changes
• Component-Based Architecture: Build reusable components for consistent interfaces
• Integrated Hot Reload: See changes instantly during development
• Intuitive DOM Manipulation: Query and modify elements with familiar selectors
• Event-Driven Programming: Handle user interactions with Python event handlers
• WebSocket Integration: Real-time communication between client and server
• Template Handoff (1.3.0): WebSocket sessions reuse the HTTP-rendered template — handlers are not executed twice on connect
• Minimal Configuration: Get started quickly with sensible defaults

Quick Start

Installation

pip install pyweber

Create a Project

# Create a new project with configuration
pyweber create-new my_app --with-config
cd my_app

Build a Simple Counter

import pyweber as pw

class Main(pw.Element):
    def __init__(self):
        super().__init__(tag='div', classes=['counter'])
        self.childs = [
            pw.Element('h1', content='Pyweber Counter'),
            pw.Element(
                tag='p',
                content='Count:',
                childs=[
                    pw.Element('span', id='count', content=0)
                ]
            ),
            pw.Element(
                'button',
                id='increment',
                content='Increment',
                events=pw.TemplateEvents(onclick=self.increment)
            )
        ]
    
    async def increment(self, e: pw.EventHandler):
        self.count = e.template.querySelector("#count")
        current = int(self.count.content)
        self.count.content = str(current + 1)
        self.create_element()
        e.update()
    
    def create_element(self):
        self.count.parent.parent.add_child(
            pw.Element(
                tag='p',
                content=self.count.content
            )
        )

class Counter(pw.Template):
    def __init__(self):
        super().__init__(template='', title='Hello pyweber')
        self.body.childs = [Main()]

app = pw.Pyweber()

@app.route('/')
def home():
    return Counter()

if __name__ == "__main__":
    pw.run(route='/')

Run your application:

pyweber run --reload

Core Components

Pyweber

The main application class that handles routing, middleware, and template management:

app = pw.Pyweber()

@app.route('/')
def home():
    return HomePage()

@app.route('/users/{user_id}')
def user_profile(user_id: int):
    return UserProfile(user_id=user_id)

Template

Templates represent pages or components with HTML structure and Python logic:

class HomePage(pw.Template):
    def __init__(self, app: pw.Pyweber):
        super().__init__(template="index.html")
        self.title = self.querySelector("h1")
        self.title.content = "Welcome to PyWeber!"

Element

Elements represent DOM nodes that you can manipulate:

# Create elements
button = pw.Element(tag="button", content="Click me", id="my-button")

# Modify properties
button.content = "Clicked!"
button.attrs["disabled"] = "true"
button.style["color"] = "red"
button.add_class("active")

Events

Handle user interactions with Python functions:

# Define event handlers
async def handle_click(e: pw.EventHandler):
    e.element.content = "Processing..."
    e.update()

    await process_data()
    e.element.content = "Done!"
    e.update()

# Attach events
button.events.onclick = handle_click

Window

Interact with the browser window:

# Access window properties
width = template.window.inner_width
scroll_pos = template.window.scroll_y

# Register window events
template.window.events.onresize = handle_resize
template.window.events.onscroll = handle_scroll

Comparison with Other Frameworks

Feature	PyWeber	Flask	Django	React
Learning Curve	Low	Low	High	High
Reactivity	Built-in	Manual	Manual	Built-in
DOM Manipulation	Python API	JavaScript	JavaScript	JSX
Hot Reload	Built-in	Add-on	Add-on	Built-in
Template Language	Python + HTML	Jinja2	DTL	JSX
Server-Side	Yes	Yes	Yes	No (by default)
Configuration	Simple TOML	Environment vars	settings.py	package.json
CLI Tools	Comprehensive	Limited	Extensive	Extensive

Configuration

PyWeber provides a flexible configuration system:

# Access configuration
from pyweber.config.config import config

# Get values
port = config.get("server", "port")
debug = config.get("app", "debug")

# Set values
config.set("server", "port", 9000)

Create or edit configuration files:

# Create config file
pyweber create-config-file

# Edit interactively
pyweber --edit

CLI Tools

PyWeber includes a powerful CLI:

# Create projects
pyweber create-new my_project

# Run applications
pyweber run --reload

# Manage configuration
pyweber add-section --section-name database

# Update framework
pyweber --update

Visit Pyweber Docs for complete documentation. See CHANGELOG.md for release notes (latest: 1.3.0 — Template Handoff, 405 fixes, recursion tracking).

License

Copyright 2026 Pyweber Technology. Licensed under the Apache License, Version 2.0.