St.cache_data
st.cache_data is a Streamlit decorator that caches data-returning function results and reuses them across reruns when inputs are unchanged.
Build Python Web Apps with Streamlit
st.cache_data is a Streamlit decorator or caching mechanism that stores function results and reuses them across reruns when inputs remain unchanged.
- How it is used
- Improves dashboard performance by reusing slow data-loading results across reruns and page refreshes.
- How deep it goes
- Defines decorator-based caching and demonstrates ttl and spinner options, but does not detail cache invalidation internals.
- Examples
- Uses a cached load_data function that reads sales data with pandas read_csv and displays loading feedback.
- What you can do after
- Apply it via the @st.cache_data decorator to cache slow data-loading functions and configure expiration or feedback.
Read how Build Python Web Apps with Streamlit explains st.cache_data →
The Well-Grounded Data Analyst
A Streamlit decorator that caches data-returning function results to avoid repeated computation or loading.
- How it is used
- Speeds interactive Streamlit proof-of-concept apps by preventing repeated loading of unchanged datasets.
- How deep it goes
- Explains decorator placement and shows cached helper calls, but does not detail cache invalidation or storage internals.
- Examples
- Demonstrates cached price data, county lists, and county ridgeplot data in a Wales house-price explorer.
- What you can do after
- Operate/configure Streamlit data loading by decorating helper functions whose results should persist across user actions.
Read how The Well-Grounded Data Analyst explains st.cache_data →
Related concepts
- Streamlitused by · Streamlit is an open-source Python framework for building interactive web applications, particularly for data and machine-learning applications.
- cachingimplements · Caching is the practice of storing reusable data or computation results so later access can avoid repeating retrieval or computation.
- expiration dateconfigured by · An expiration setting specifies when, or after what duration, an item, data, resource, or right ceases to be valid, available, or retained.
- decoratorkind of · A decorator is a programming-language construct that adds metadata or behavior to, or transforms, a program declaration, often a function or class.
- reruncontrasts with · A Streamlit development setting that automatically reruns an app when its source code changes.
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