st.selectbox

Display a select widget.

Function signature[source]
st.selectbox(label, options, index=0, format_func=special_internal_function, key=None, help=None, on_change=None, args=None, kwargs=None, *, placeholder="Choose an option", disabled=False, label_visibility="visible")
Parameters
label (str)	A short label explaining to the user what this select widget is for. The label can optionally contain GitHub-flavored Markdown of the following types: Bold, Italics, Strikethroughs, Inline Code, Links, and Images. Images display like icons, with a max height equal to the font height. Unsupported Markdown 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"`. See the `body` parameter of `st.markdown` for additional, supported Markdown directives. For accessibility reasons, you should never set an empty label, but you can hide it with `label_visibility` if needed. In the future, we may disallow empty labels by raising an exception.
options (Iterable)	Labels for the select options in an `Iterable`. This can be a `list`, `set`, or anything supported by `st.dataframe`. If `options` is dataframe-like, the first column will be used. Each label will be cast to `str` internally by default.
index (int)	The index of the preselected option on first render. If `None`, will initialize empty and return `None` until the user selects an option. Defaults to 0 (the first option).
format_func (function)	Function to modify the display of the options. It receives the raw option as an argument and should output the label to be shown for that option. This has no impact on the return value of the command.
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. No two widgets may have the same key.
help (str)	An optional tooltip that gets displayed next to the widget label. Streamlit only displays the tooltip when `label_visibility="visible"`.
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.
placeholder (str)	A string to display when no options are selected. Defaults to "Choose an option".
disabled (bool)	An optional boolean that disables the selectbox if set to `True`. The default is `False`.
label_visibility ("visible", "hidden", or "collapsed")	The visibility of the label. The default is `"visible"`. If this is `"hidden"`, Streamlit displays an empty spacer instead of the label, which can help keep the widget alligned with other widgets. If this is `"collapsed"`, Streamlit displays no label or spacer.
Returns
(any)	The selected option or `None` if no option is selected.

Example

import streamlit as st

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

st.write("You selected:", option)

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To initialize an empty selectbox, use None as the index value:

import streamlit as st

option = st.selectbox(
    "How would you like to be contacted?",
    ("Email", "Home phone", "Mobile phone"),
    index=None,
    placeholder="Select contact method...",
)

st.write("You selected:", option)

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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 disabled parameter:

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,
    )

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