To find rows where an “order_id” column has duplicated values, use:

When should st.radio be preferred over st.selectbox?

To display a Plotly figure with full interactivity in Streamlit:

You apply str.contains to a column that has some NaN values. Without the na argument, what happens?

Streamlit was preferred over Dash for this course because:

To make st.metric color its delta value red when negative and green when positive:

Which widget returns a list of selected values?

Which argument to st.set_page_config uses the full screen width?

An API returns 100 results per page and you need all 4,800 results. The standard approach is:

Why should the function decorated with @st.cache_data NOT return a mutable object the caller plans to modify?