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_visibility="visible")
A short label explaining to the user what this select widget is for. The label can optionally contain Markdown and supports the following elements: Bold, Italics, Strikethroughs, Inline Code, Emojis, and Links.
This also supports:
Unsupported elements are unwrapped so only their children (text contents) render. Display unsupported elements as literal characters by backslash-escaping them. E.g. 1\. Not an ordered list.
For accessibility reasons, you should never set an empty label (label="") but hide it with label_visibility if needed. In the future, we may disallow empty labels by raising an exception.
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.
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.
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.
An optional tooltip that gets displayed next to the selectbox.
An optional callback invoked when this selectbox's value changes.
An optional tuple of args to pass to the callback.
An optional dict of kwargs to pass to the callback.
An optional boolean, which disables the selectbox if set to True. The default is False. This argument can only be supplied by keyword.
label_visibility ("visible" or "hidden" or "collapsed")
The visibility of the label. If "hidden", the label doesn't show but there is still empty space for it above the widget (equivalent to label=""). If "collapsed", both the label and the space are removed. Default is "visible". This argument can only be supplied by keyword.
The selected option
import streamlit as st option = st.selectbox( 'How would you like to be contacted?', ('Email', 'Home phone', 'Mobile phone')) st.write('You selected:', option)
Select widgets can customize how to hide their labels with the
label_visibility parameter. If "hidden", the label doesn’t show but there is still empty space for it above the widget (equivalent to
label=""). If "collapsed", both the label and the space are removed. Default is "visible". Select widgets can also be disabled with the
import streamlit as st # Store the initial value of widgets in session state if "visibility" not in st.session_state: st.session_state.visibility = "visible" st.session_state.disabled = False col1, col2 = st.columns(2) with col1: st.checkbox("Disable selectbox widget", key="disabled") st.radio( "Set selectbox label visibility 👉", key="visibility", options=["visible", "hidden", "collapsed"], ) with col2: option = st.selectbox( "How would you like to be contacted?", ("Email", "Home phone", "Mobile phone"), label_visibility=st.session_state.visibility, disabled=st.session_state.disabled, )