Streamlit

Streamlit is an open-source Python library that makes it easy to build beautiful custom web-apps for machine learning and data science.

• Streamlit Documentation
• Streamlit App Gallery
• Streamlit Source

Deploying

Streamlit apps can be deployed with the rsconnect-python package.

For Streamlit apps, the entrypoint is the name of the Python file containing your app. For example, if your app's source file is named main.py, use:

rsconnect deploy streamlit -n <saved server name> --entrypoint main.py ...

Example apps

There are some Streamlit example apps available from the Streamlit developers:

• Uber Pickups in New York City
• Face-GAN explorer

To deploy one of these examples, first clone the repository:

git clone https://github.com/streamlit/<app-name>

Install any required dependencies. Test the app locally:

streamlit run <app-name>/streamlit_app.py

Then deploy to Posit Connect:

rsconnect deploy streamlit -n <saved server name> --entrypoint streamlit_app.py <app-name>/

User meta-data

You can retrieve the username and group information provided by Posit Connect using the following Streamlit code, in Streamlit versions up to 1.11. Streamlit 1.12 removed this feature.

import json

try:
    # Streamlit 1.8 or newer
    from streamlit.scriptrunner import get_script_run_ctx
except ImportError:
    from streamlit.script_run_context import get_script_run_ctx

from streamlit.server.server import Server

def get_user_info():
    session_id = get_script_run_ctx().session_id
    session_info = Server.get_current()._get_session_info(session_id)

    if session_info is None:
        raise Exception("Couldn't get your Streamlit session.")

    user_info_json = session_info.ws.request.headers.get("Rstudio-Connect-Credentials")
    if user_info_json is None:
        return None
    return json.loads(user_info_json)

def get_username():
    user_info = get_user_info()
    if user_info is None:
        return None
    return user_info.get("user")

st.write("Username: " + get_username())

User and Group uniqueness

Most environments have unique usernames where each user identifies a single user and groups the name of the groups the user is a member of.

However, in large organizations with hundreds of users and groups, this may not be true. See the Admin Guide sections Credentials for Content for more information.

Limitations

Version Compatibility

• Posit Connect requires Streamlit v56.1 or higher.

Bokeh Compatibility

• Streamlit versions starting with 0.57 require Bokeh 2.0 or higher.
• Streamlit versions prior to 0.57 require Bokeh 1.4.
• Bokeh charts embedded within Streamlit can use Javascript callback functions, but Bokeh's Python callbacks are not supported by Streamlit.