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using-streamlit-session-state

Manage persistent state across Streamlit reruns with st.session_state.

1|1|Updated Nov 9, 2025
Search Tags:#web development#state management#python#callbacks#streamlit#session state
One-click install
npx skills add https://github.com/Paldom/databricks-apps-streamlit-vibe-coding-starter --skill using-streamlit-session-state-paldom
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: using-streamlit-session-state
Source: https://github.com/Paldom/databricks-apps-streamlit-vibe-coding-starter/tree/main/.agents/skills/developing-with-streamlit/skills/using-streamlit-session-state
Command: npx skills add https://github.com/Paldom/databricks-apps-streamlit-vibe-coding-starter --skill using-streamlit-session-state-paldom

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill addresses the challenge of maintaining data and widget states across multiple user interactions within a Streamlit application, preventing data loss and ensuring a smooth user experience.

Core Features & Use Cases

  • State Persistence: Stores variables and widget states across script reruns.
  • Widget Synchronization: Automatically links widget values to session state using the key parameter.
  • Callback Handling: Enables state updates before script reruns via on_change and on_click.
  • Use Case: In an interactive data visualization app, use session state to remember the user's selected filters and chart type, so they don't have to re-select them every time they interact with the plot.

Quick Start

Initialize a session state variable named 'counter' to zero using st.session_state.setdefault.

Frequently Asked Questions about using-streamlit-session-state

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I persist data across Streamlit script reruns?▼

To persist data across Streamlit reruns, use st.session_state to store variables and widget states, preventing data loss when the script executes again after user interactions.

How do I synchronize Streamlit widget values with session state?▼

Synchronize Streamlit widget values with session state by assigning a unique key parameter to the widget, which automatically links the widget's current value to the corresponding session state entry.

Why does my Streamlit callback execute state changes inconsistently?▼

Streamlit callback state changes require using on_change or on_click parameters to execute updates before the script reruns, avoiding the common pitfall of modifying state after widget creation.

Can I share session state across multiple pages in a Streamlit app?▼

You can share session state across multiple pages in a Streamlit app by utilizing established patterns for multipage state sharing, ensuring data remains consistent throughout different navigation routes.

What are the limitations of using module-level mutable state in Streamlit?▼

Module-level mutable state in Streamlit causes unexpected behavior because it persists across user sessions, whereas st.session_state isolates variables per user session to prevent data cross-contamination.

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