Display a select widget.
Function signature

st.selectbox(label, options, index=0, format_func=special_internal_function, key=None, help=None, on_change=None, args=None, kwargs=None, *, disabled=False)


label (str)

A short label explaining to the user what this select widget is for.

options (Sequence, numpy.ndarray, pandas.Series, pandas.DataFrame, or pandas.Index)

Labels for the select options. This will be cast to str internally by default. For pandas.DataFrame, the first column is selected.

index (int)

The index of the preselected option on first render.

format_func (function)

Function to modify the display of the labels. It receives the option as an argument and its output will be cast to str.

key (str or int)

An optional string or integer 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.

help (str)

An optional tooltip that gets displayed next to the selectbox.

on_change (callable)

An optional callback invoked when this selectbox's value changes.

args (tuple)

An optional tuple of args to pass to the callback.

kwargs (dict)

An optional dict of kwargs to pass to the callback.

disabled (bool)

An optional boolean, which disables the selectbox if set to True. The default is False. This argument can only be supplied by keyword.



The selected option


option = st.selectbox(
     'How would you like to be contacted?',
     ('Email', 'Home phone', 'Mobile phone'))

st.write('You selected:', option)
(view standalone Streamlit app)

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