Python应用开发——30天学习Streamlit Python包进行APP的构建（12）

st.checkbox(label, value=False, key=None, help=None, on_change=None, args=None, kwargs=None, *, disabled=False, label_visibility="visible")

Returns

(bool)

Whether or not the checkbox is checked.

Parameters

label (str)

A short label explaining to the user what this checkbox is for. The label can optionally contain Markdown and supports the following elements: Bold, Italics, Strikethroughs, Inline Code, Emojis, and Links. This also supports: Emoji shortcodes, such as :+1: and :sunglasses:. For a list of all supported codes, see https://share.streamlit.io/streamlit/emoji-shortcodes.LaTeX expressions, by wrapping them in "$" or "$$" (the "$$" must be on their own lines). Supported LaTeX functions are listed at Supported Functions · KaTeX.Colored text and background colors for text, using the syntax :color[text to be colored] and :color-background[text to be colored], respectively. color must be replaced with any of the following supported colors: blue, green, orange, red, violet, gray/grey, rainbow. For example, you can use :orange[your text here] or :blue-background[your text here].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.

value (bool)

Preselect the checkbox when it first renders. This will be cast to bool internally.

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 checkbox.

on_change (callable)

An optional callback invoked when this checkbox'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 checkbox if set to True. The default is False.

label_visibility ("visible", "hidden", or "collapsed")

The visibility of the label. If "hidden", the label doesn't show but there is still empty space for it (equivalent to label=""). If "collapsed", both the label and the space are removed. Default is "visible".

st.color_picker(label, value=None, key=None, help=None, on_change=None, args=None, kwargs=None, *, disabled=False, label_visibility="visible")

Returns

(str)

The selected color as a hex string.

Parameters

label (str)

A short label explaining to the user what this input is for. The label can optionally contain Markdown and supports the following elements: Bold, Italics, Strikethroughs, Inline Code, Emojis, and Links. This also supports: Emoji shortcodes, such as :+1: and :sunglasses:. For a list of all supported codes, see https://share.streamlit.io/streamlit/emoji-shortcodes.LaTeX expressions, by wrapping them in "$" or "$$" (the "$$" must be on their own lines). Supported LaTeX functions are listed at Supported Functions · KaTeX.Colored text and background colors for text, using the syntax :color[text to be colored] and :color-background[text to be colored], respectively. color must be replaced with any of the following supported colors: blue, green, orange, red, violet, gray/grey, rainbow. For example, you can use :orange[your text here] or :blue-background[your text here].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.

value (str)

The hex value of this widget when it first renders. If None, defaults to black.

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 color picker.

on_change (callable)

An optional callback invoked when this color_picker'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 color picker if set to True. The default is False. This argument can only be supplied by keyword.

label_visibility ("visible", "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".

st.multiselect(label, options, default=None, format_func=special_internal_function, key=None, help=None, on_change=None, args=None, kwargs=None, *, max_selections=None, placeholder="Choose an option", disabled=False, label_visibility="visible")

Returns

(list)

A list with the selected options

Parameters

label (str)

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: Emoji shortcodes, such as :+1: and :sunglasses:. For a list of all supported codes, see https://share.streamlit.io/streamlit/emoji-shortcodes.LaTeX expressions, by wrapping them in "$" or "$$" (the "$$" must be on their own lines). Supported LaTeX functions are listed at Supported Functions · KaTeX.Colored text and background colors for text, using the syntax :color[text to be colored] and :color-background[text to be colored], respectively. color must be replaced with any of the following supported colors: blue, green, orange, red, violet, gray/grey, rainbow. For example, you can use :orange[your text here] or :blue-background[your text here].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 (Iterable)

Labels for the select options in an Iterable. For example, this can be a list, numpy.ndarray, pandas.Series, pandas.DataFrame, or pandas.Index. For pandas.DataFrame, the first column is used. Each label will be cast to str internally by default.

default (Iterable of V, V, or None)

List of default values. Can also be a single value.

format_func (function)

Function to modify the display of selectbox 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 multiselect.

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 multiselect.

on_change (callable)

An optional callback invoked when this multiselect'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.

max_selections (int)

The max selections that can be selected at a time.

placeholder (str)

A string to display when no options are selected. Defaults to 'Choose an option'.

disabled (bool)

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

label_visibility ("visible", "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".

st.radio(label, options, index=0, format_func=special_internal_function, key=None, help=None, on_change=None, args=None, kwargs=None, *, disabled=False, horizontal=False, captions=None, label_visibility="visible")

Returns

(any)

The selected option or None if no option is selected.

Parameters

label (str)

A short label explaining to the user what this radio group is for. The label can optionally contain Markdown and supports the following elements: Bold, Italics, Strikethroughs, Inline Code, Emojis, and Links. This also supports: Emoji shortcodes, such as :+1: and :sunglasses:. For a list of all supported codes, see https://share.streamlit.io/streamlit/emoji-shortcodes.LaTeX expressions, by wrapping them in "$" or "$$" (the "$$" must be on their own lines). Supported LaTeX functions are listed at Supported Functions · KaTeX.Colored text and background colors for text, using the syntax :color[text to be colored] and :color-background[text to be colored], respectively. color must be replaced with any of the following supported colors: blue, green, orange, red, violet, gray/grey, rainbow. For example, you can use :orange[your text here] or :blue-background[your text here].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 (Iterable)

Labels for the select options in an Iterable. For example, this can be a list, numpy.ndarray, pandas.Series, pandas.DataFrame, or pandas.Index. For pandas.DataFrame, the first column is used. Labels can include markdown as described in the label parameter and will be cast to str internally by default.

index (int or None)

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 radio 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 radio.

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 radio.

on_change (callable)

An optional callback invoked when this radio'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 radio button if set to True. The default is False.

horizontal (bool)

An optional boolean, which orients the radio group horizontally. The default is false (vertical buttons).

captions (iterable of str or None)

A list of captions to show below each radio button. If None (default), no captions are shown.

label_visibility ("visible", "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".

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")

Returns

(any)

The selected option or None if no option is selected.

Parameters

label (str)

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: Emoji shortcodes, such as :+1: and :sunglasses:. For a list of all supported codes, see https://share.streamlit.io/streamlit/emoji-shortcodes.LaTeX expressions, by wrapping them in "$" or "$$" (the "$$" must be on their own lines). Supported LaTeX functions are listed at Supported Functions · KaTeX.Colored text and background colors for text, using the syntax :color[text to be colored] and :color-background[text to be colored], respectively. color must be replaced with any of the following supported colors: blue, green, orange, red, violet, gray/grey, rainbow. For example, you can use :orange[your text here] or :blue-background[your text here].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 (Iterable)

Labels for the select options in an Iterable. For example, this can be a list, numpy.ndarray, pandas.Series, pandas.DataFrame, or pandas.Index. For pandas.DataFrame, the first column is 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 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.

placeholder (str)

A string to display when no options are selected. Defaults to "Choose an option".

disabled (bool)

An optional boolean, which disables the selectbox if set to True. The default is False.

label_visibility ("visible", "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".

st.select_slider(label, options=(), value=None, format_func=special_internal_function, key=None, help=None, on_change=None, args=None, kwargs=None, *, disabled=False, label_visibility="visible")

Returns

(any value or tuple of any value)

The current value of the slider widget. The return type will match the data type of the value parameter.

Parameters

label (str)

A short label explaining to the user what this slider is for. The label can optionally contain Markdown and supports the following elements: Bold, Italics, Strikethroughs, Inline Code, Emojis, and Links. This also supports: Emoji shortcodes, such as :+1: and :sunglasses:. For a list of all supported codes, see https://share.streamlit.io/streamlit/emoji-shortcodes.LaTeX expressions, by wrapping them in "$" or "$$" (the "$$" must be on their own lines). Supported LaTeX functions are listed at Supported Functions · KaTeX.Colored text and background colors for text, using the syntax :color[text to be colored] and :color-background[text to be colored], respectively. color must be replaced with any of the following supported colors: blue, green, orange, red, violet, gray/grey, rainbow. For example, you can use :orange[your text here] or :blue-background[your text here].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 (Iterable)

Labels for the select options in an Iterable. For example, this can be a list, numpy.ndarray, pandas.Series, pandas.DataFrame, or pandas.Index. For pandas.DataFrame, the first column is used. Each label will be cast to str internally by default.

value (a supported type or a tuple/list of supported types or None)

The value of the slider when it first renders. If a tuple/list of two values is passed here, then a range slider with those lower and upper bounds is rendered. For example, if set to (1, 10) the slider will have a selectable range between 1 and 10. Defaults to first option.

format_func (function)

Function to modify the display of the labels from the options. argument. 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 select slider.

on_change (callable)

An optional callback invoked when this select_slider'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 select slider if set to True. The default is False.

label_visibility ("visible", "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".

st.toggle(label, value=False, key=None, help=None, on_change=None, args=None, kwargs=None, *, disabled=False, label_visibility="visible")

Returns

(bool)

Whether or not the toggle is checked.

Parameters

label (str)

A short label explaining to the user what this toggle is for. The label can optionally contain Markdown and supports the following elements: Bold, Italics, Strikethroughs, Inline Code, Emojis, and Links. This also supports: Emoji shortcodes, such as :+1: and :sunglasses:. For a list of all supported codes, see https://share.streamlit.io/streamlit/emoji-shortcodes.LaTeX expressions, by wrapping them in "$" or "$$" (the "$$" must be on their own lines). Supported LaTeX functions are listed at Supported Functions · KaTeX.Colored text and background colors for text, using the syntax :color[text to be colored] and :color-background[text to be colored], respectively. color must be replaced with any of the following supported colors: blue, green, orange, red, violet, gray/grey, rainbow. For example, you can use :orange[your text here] or :blue-background[your text here].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.

value (bool)

Preselect the toggle when it first renders. This will be cast to bool internally.

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 toggle.

on_change (callable)

An optional callback invoked when this toggle'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 toggle if set to True. The default is False.

label_visibility ("visible", "hidden", or "collapsed")

The visibility of the label. If "hidden", the label doesn't show but there is still empty space for it (equivalent to label=""). If "collapsed", both the label and the space are removed. Default is "visible".