Session
A session is a bounded interaction context associated with a user, client, or process that may maintain state across related operations or requests.
Build Python Web Apps with Streamlit
st.session_state is Streamlit's session-scoped state store for retaining values across reruns of an app session.
- How it is used
- Keeps interactive app values, such as tasks and widget selections, available across Streamlit reruns.
- How deep it goes
- Explains session lifetime, dictionary-like operations, conditional initialization, and widget assignment order; leaves external persistence for later.
- Examples
- Uses an incrementing counter, a to-do list, dashboard deep links, and simulated movie-search interactions.
- What you can do after
- Build it from scratch with `st.session_state` to retain app values across reruns and initialize them without resetting them.
Read how Build Python Web Apps with Streamlit explains session →
Pro ASP.NET Core 7, Tenth Edition
Session state is client-specific data stored on the server for access across multiple requests within a session.
- How it is used
- Keeps shopping-cart state and other client-specific data available across related requests.
- How deep it goes
- Works through service registration, middleware placement, storage choices, options, keyed access, and commits without detailing cache internals.
- Examples
- Uses a request counter endpoint and a JSON-serialized shopping cart to demonstrate persistence across requests.
- What you can do after
- Operate/configure it to retain per-client values across requests and detect cache-write failures with CommitAsync.
Read how Pro ASP.NET Core 7, Tenth Edition explains session →
AI-Powered Search
A session is a bounded sequence of interactions associated with a user or client context during a period of activity.
- How it is used
- Uses sessions to preserve search context and turn user interactions into signals for relevance learning.
- How deep it goes
- Defines identifier scope and shows session-level click data, but stops short of specifying a universal session-timeout rule.
- Examples
- Uses a Transformers movie query, session 3, ranked documents, click flags, pandas inspection, and CTR aggregation.
- What you can do after
- Apply session records via pandas to inspect interactions and prepare click-based judgments for learning to rank.
Python How-To
Session state is per-session storage that preserves application data across reruns of a web application script.
- How it is used
- Preserves user choices and activity across Streamlit reruns while a browser tab remains active.
- How deep it goes
- Defines key-value storage and demonstrates initialization, updates, filtering state, and menu-based routing.
- Examples
- Uses a task-management app with menu selection, working-task storage, and sorting and filtering dictionaries.
- What you can do after
- Operate/configure Streamlit applications that retain menu, task, sorting, and filtering choices across input-triggered reruns.
MongoDB 8.0 in Action, Third Edition
A client session is an application-created MongoDB session context that groups operations and supports transactions, ordering, and related settings.
- How it is used
- Groups transaction operations while preserving their order, causal relationships, and shared transaction context.
- How deep it goes
- Explains session association, transaction options, cleanup, and labeled-error retries through mongosh and driver examples.
- Examples
- Demonstrates account, customer, and transaction updates using mongosh, Node.js, PyMongo, and Ruby callback APIs.
- What you can do after
- Operate/configure transactions by creating sessions, associating operations, selecting concerns, cleaning up, and handling retries.
Read how MongoDB 8.0 in Action, Third Edition explains session →
Related concepts
- Enter-PSSessionpart of · Enter-PSSession is a PowerShell cmdlet that starts an interactive session with a local or remote computer.
- Invoke-Commandpart of · Invoke-Command is a PowerShell cmdlet that runs commands or scripts on local or remote computers.
- trajectoryhas part · A trajectory is an ordered sequence of states, actions, events, or operations that records or describes progression through successive steps or over time.
- persistent connectionkind of · A persistent connection is a communication link kept open for reuse across multiple messages or operations, rather than reestablished for each exchange.
- dialoguekind of · Dialogue is an ordered exchange of related messages across successive turns between participants or an interactive system and its users.
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