st.selectbox(label, options, index=0, format_func=special_internal_function, key=None, help=None)
A short label explaining to the user what this select widget is for.
options (list, tuple, numpy.ndarray, pandas.Series, or pandas.DataFrame)
Labels for the select options. This will be cast to str internally by default. For pandas.DataFrame, the first column is selected.
The index of the preselected option on first render.
Function to modify the display of the labels. It receives the option as an argument and its output will be cast to str.
An optional string to use as the unique key for the widget. If this is omitted, a key will be generated for the widget based on its content. Multiple widgets of the same type may not share the same key.
A tooltip that gets displayed next to the selectbox.
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