htag

2.0.27 verified Sat May 09 auth: no python

htag is a Python GUI toolkit for building beautiful applications for mobile, web, and desktop from a single codebase, using a reactive component model similar to React. Version 2.0.27 runs on Python >= 3.10. It is actively maintained with regular releases.

pip install htag

Common errors

error ImportError: cannot import name 'HTag' from 'htag' ↓

cause Incorrect import path or old version (<2.0).

fix

Install or upgrade to htag >= 2.0: pip install -U htag, then use from htag import HTag.

error AttributeError: 'MyApp' object has no attribute 'init' ↓

cause Component class defined `__init__` instead of `init`.

fix

Override def init(self): (no underscores) in your component class.

Warnings

breaking htag 2.0 dropped the old imperative API. The `HTag` class now uses a reactive pattern; components must override `init()` instead of `__init__`. ↓

fix Migrate components to subclass `HTag` and define `def init(self):` instead of `__init__`.

breaking The `run()` method signature changed. In htag 2.x, runners require an explicit import from `htag.runners`. ↓

fix Replace `HTag.run()` with explicit runner import, e.g., `from htag.runners import BrowserHTTP`.

gotcha Event handlers must be defined as methods of the HTag subclass, not as standalone functions or lambdas in some contexts. ↓

fix Define event handlers inside the class; use `self.bind(event, handler)` or decorate with `@HTag.event`.

Imports

HTag
```
from htag import HTag
```
Tag
wrong
```
from htag import Tag
```
correct
```
from htag.tag import Tag
```
Tag class is in the tag submodule; direct import from htag may fail.

Quickstart

Create a simple app that displays 'Hello World!' in the browser.

from htag import HTag

class MyApp(HTag):
    def init(self):
        self += "Hello World!"

if __name__ == "__main__":
    from htag.runners import BrowserHTTP
    BrowserHTTP(MyApp).run()