How deeply does Build Python Web Apps with Streamlit cover st.data_editor?

Explains returned edits, fixed rows, widget keys, and column configuration, but stops short of broader editor internals.

St.data_editor

As explained in Build Python Web Apps with Streamlit

st.data_editor is a Streamlit widget that displays editable tabular or collection data and returns the user's edits.

st.data_editor displays tabular or collection data in an editable, spreadsheet-like widget. Pass initial data to it, then use the returned value as the user's current edits. section 9.7.1 section 9.8

Edit game settings

A settings table can let players choose a quizmaster and difficulty. Use num_rows='fixed' when the application needs exactly one settings row: settings = st.data_editor(default_settings, num_rows='fixed', key='settings_editor'). Before interaction, settings matches default_settings; after an edit, it contains the changed dataframe across reruns. section 9.7.1

Configure the editor around the application's constraints:

Set num_rows='fixed' to prevent users from adding rows when each setting should have one value. section 9.7.1
Give the widget a key so it is represented in session state and protected from a Streamlit widget-state quirk. section 9.7.1

How Build Python Web Apps with Streamlit covers it

Cover of Build Python Web Apps with Streamlit

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Related concepts

data frameuses · A data frame is a two-dimensional tabular data structure with labeled rows and columns that can contain values of different types.
st.column_configconfigured by · st.column_config is Streamlit's API for configuring the behavior and presentation of columns in data editor and dataframe views.
st.popoverused by · st.popover is a Streamlit layout element that reveals a small popup panel when its associated trigger is activated.
settings editorused by · A settings editor is a user-interface pattern for viewing and changing configurable application options.

This explainer was generated by Manning's knowledge graph from the text of Build Python Web Apps with Streamlit. The section links point to the parts of the book it draws on.