hstream 0.0.20

Create python webapps with ease

HStream

Easiest interactive python web app using htmx and semantic html

Usage

pip install hstream

# main.py

from hstream import hs

visitor_name = hs.text_input("What's your name?", default_value = "friend")

hs.markdown(f"Welcome {visitor_name}")

python -m hstream main.py

or here's a fuller example

Examples

• Select demo
• Static files
• Theming
• More

Motivation

Love Streamlit but:

• impossible to customise beyond PoC phase
• hard to reason about when extending and deploying
• non-standard approach doesn't play nicely with existing ecosystems

H-(html)-Stream is built with semantic html, FastApi and htmx to provide a fast and simple framework for rapid web app development that follows traditional frontend/server architecture (or at least follow it closer than Streamlit).

Features

• live server reload on file change (through univorn)
• semantic html and basic html manipulation from within script
• basic components - see below
• swap stylesheet
• complex html manipulation from within script (setting attributes)
• plotly plot support
• select component
• multi select component
• auto ssl certs for easy deployment
• example component architecture
• reload browser on code change

Bugs

• key handling is a little inconsistent and it's not clear to the user when they need to use keys - meaning if you run into reloading / rending issues provide all you components with unique key parameter

Components

hs.markdown

hs.text_input

hs.checkbox

hs.button: renders and evaluates to true if the user click the button (still a little unsure exactly how this should be implemented as evaluating to true doesn't quite capture the ideal of pressing a button)

hs.slider: numeric slider input

hs.plot: output matplotlib figures to the user

hs.image: display an image

hs.html: allows more complex formatting, for example:

• a html form

from hstream import hs
with hs.html('form'):
    hs.text_input('Name')
    hs.checkbox('Would you like to be my friend?')

• a card provided by mvp.css

from hstream import hs
with hs.html('section'):
    with hs.html('aside'):
        hs.markdown('We can make some beautiful pages very simply')
    with hs.html('aside'):
        hs.markdown('For example these responsive cards, which respond to screen sizes')
    with hs.html('aside'):
        hs.markdown('Thanks to: ')
        with hs.html('a', href='https://andybrewer.github.io/mvp/'):
            hs.markdown('mvp.css')

hs.stylesheet_href = https://unpkg.com/@vladocar/basic.css@1.0.3/css/basic.css to use a different classless css framework

hs.app: to directly access the FastAPI instance if you want to extend it like a normal webserver (i.e. add custom paths, static files ect.)

Technologies

Big thanks to the following libraries in particular

• Streamlit
• htmx
• Yattag
• pico css
• MVP.css
• FastAPI
• uvicorn