What is this?

Horizontal Layout adds a few new tools to Streamlit to make it easier for you to lay out your app! Here's what's coming:

1. st.beta_container: A single block that permits multiple Streamlit elements
2. st.beta_columns: Lay out multiple containers of the same width, side-by-side
3. with column1: st.write("hi!"): Syntax sugar to specify where an element should go
4. st.beta_expander: Expand/collapse widget, wrapping a single container

(BTW, more layout features will be coming to Streamlit — this is just the first phase!)

Get the beta

TLDR: pip install the nightly build

1. [OPTIONAL] Set up Pipenv, so that you don't overwrite your normal Streamlit installation

   $ pip install pipenv
   $ pipenv shell
   

2. Get the latest nightly build

   $ pip install streamlit-nightly
   

3. Run Streamlit with the new features!

   $ streamlit run my_app.py
   
   # Here's an example you can use:
   $ streamlit run <https://raw.githubusercontent.com/akrolsmir/married-dinosaurs/master/app.py>
   

Deploy to S4A

TLDR: Add streamlit-nightly to your requirements.txt

1. Create a requirements.txt file in your S4A repo, if it does not exist

2. In the requirements.txt, add a line with the version of streamlit-nightly used. Make sure the version is 0.67.1.dev20200921 or higher

   Sample requirements.txt

   streamlit-nightly >= 0.67.1.dev20200921
   

3. Push your repo to Github, and add it in S4A!

Sample directory structure

your-s4a-repo/
    streamlit_app.py
    requirements.txt