flet README

The project's README from github.com/flet-dev/flet. As one markdown file: README.md.

Flet logo

Build multi-platform apps in Python. No frontend experience required.

License Package version Monthly downloads Python >= 3.10 Build status Docstring coverage

Flet is a framework that allows building mobile, desktop and web applications in Python only without prior experience in frontend development.

   Single code base for any device

Your app will equally look great on iOS, Android, Windows, Linux, macOS and web.

   Build an entire app in Python

Build a cross-platform app without knowledge of Dart, Swift, Kotlin, HTML or JavaScript - only Python!

   150+ built-in controls and services

Beautiful UI widgets with Material and Cupertino design: layout, navigation, dialogs, charts - Flet uses Flutter to render UI.

   50+ Python packages for iOS and Android

Numpy, pandas, pydantic, cryptography, opencv, pillow and other popular libraries.

   Full web support

Flet apps run natively in modern browsers using WebAssembly and Pyodide, with no server required. Prefer server-side? Deploy as a Python web app with real-time UI updates.

   Built-in packaging

Build standalone executables or bundles for iOS, Android, Windows, Linux, macOS and web. Instantly deploy to App Store and Google Play.

   Test on iOS and Android

Test your project on your own mobile device with Flet App. See your app updates as you make changes.

   Extensible

Easily wrap any of thousands of Flutter packages to use with Flet or build new controls in pure Python using built-in UI primitives.

   Accessible

Flet is built with Flutter which has solid accessibility foundations on Android, iOS, web, and desktop.

Flet app example

Below is a simple "Counter" app, with a text field and two buttons to increment and decrement the counter value:

import flet as ft

def main(page: ft.Page):
    page.title = "Flet counter example"
    page.vertical_alignment = ft.MainAxisAlignment.CENTER

    input = ft.TextField(value="0", text_align=ft.TextAlign.RIGHT, width=100)

    def minus_click(e):
        input.value = str(int(input.value) - 1)

    def plus_click(e):
        input.value = str(int(input.value) + 1)

    page.add(
        ft.Row(
            alignment=ft.MainAxisAlignment.CENTER,
            controls=[
                ft.IconButton(ft.Icons.REMOVE, on_click=minus_click),
                input,
                ft.IconButton(ft.Icons.ADD, on_click=plus_click),
            ],
        )
    )

ft.run(main)

To run the app, install flet:

pip install 'flet[all]'

then launch the app:

flet run counter.py

This will open the app in a native OS window - what a nice alternative to Electron! 🙂

To run the same app as a web app use --web option with flet run command:

flet run --web counter.py

Learn more

Community

Contributing

Want to help improve Flet? Check out the contribution guide.

flet (flet-dev/flet)

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17.4K ·GitHub
Flet
这是什么东西?Flet 是一个 Python 框架,只用一套 Python 代码就能构建网页、移动端和桌面应用——不需要任何前端经验,界面由 Flutter 负责渲染。
所以它是个框架,不是可视化应用构建器——那我实际要写什么?整个应用都用 Python 编写,使用 Flet 提供的控件;框架负责通过 Flutter 渲染界面、输出多平台版本以及打包。
我怎么把第一个应用跑起来?先安装 flet,然后用 'flet run' 启动——应用会在系统的原生窗口中打开;加上 '--web' 参数,就可以改成在浏览器里运行同一个应用。
除了 Python,我还需要 Dart、Swift 或 JavaScript 吗?不需要——只用 Python。Flet 甚至为 iOS 和 Android 内置了 50 多个常用的 Python 包,包括 numpy、pandas、pydantic、cryptography、opencv 和 pillow。
同一份代码真的能同时覆盖手机、桌面和浏览器吗?可以——一套代码可以面向 iOS、Android、Windows、Linux、macOS 和网页。在浏览器里,它通过 WebAssembly 和 Pyodide 原生运行,不需要服务器;也可以部署在服务器端,界面实时更新。
它自带哪些界面组件?内置 150 多个控件和服务,采用 Material 和 Cupertino 设计风格:包括布局、导航、对话框和图表。
开发的时候,我怎样在自己手机上测试应用?用 Flet App 在你自己的 iOS 或 Android 设备上打开项目,改动代码后就能看到更新实时出现。
做完的应用怎么分发出去?内置的打包功能可以生成独立的可执行文件或安装包,支持 iOS、Android、Windows、Linux、macOS 和网页,可以直接上架 App Store 和 Google Play。
Flet 没提供的控件,我能自己加吗?可以——把数千个现成的 Flutter 包封装后给 Flet 使用,或者用内置的 UI 基础组件,纯用 Python 编写全新的控件。
What are similar projects?flutter, Avalonia, native, compose-multiplatform, kivy, FlutterExampleApps, samples, egui
Which topics is it in?ui-framework, packaging, material-design, flutter, accessibility, wasm, real-time, mobile-app, ui-components, desktop, ios, web-app
Creator
flet-dev
Size
217.5 MB
Stars
17.4K
Updated
CommitOct 08Releasev1.0.4Oct 08
Age
4y
Commits · 90 Days