ButtonGroup

__init__(
    self,
    master,
    options=[],
    selected=None,
    horizontal=False,
    command=None,
    grid=None,
    align=None,
    args=None,
    visible=True,
    enabled=None,
    width=None,
    height=None)

What is it?

The ButtonGroup object displays a group of radio buttons, allowing the user to choose a single option.

How do I make one?

Create a ButtonGroup object like this:

from guizero import App, ButtonGroup
app = App()
choice = ButtonGroup(app, options=["cheese", "ham", "salad"], selected="cheese")
app.display()

Starting parameters

When you create a ButtonGroup object you must specify a master and you can specify any of the optional parameters. Specify parameters in the brackets like this: choice = ButtonGroup(app, options=["cheese", "ham", "salad"], selected=1)

Parameter	Takes	Default	Compulsory	Description
master	App, Window or Box	-	Yes	The container to which this widget belongs
options	list or 2D List	-	No	Either a list or a 2D list of [text, value] pairs. If a 2D list is specified, the first item in the pair will be displayed on the interface, and the second item will be a hidden value associated with this option.
selected	string	-	-	The option that should be selected, if a value isn't provided the first option will be selected.
align	string	None	-	Alignment of this widget within its container. Possible values: "top", "bottom", "left", "right".
command	function name	None	-	The name of a function to call when the selected option changes.
args	list	None	-	If you wish to pass any arguments to the function specified in the command parameter, you can specify them as a list
grid	list [int, int]	None	-	[x,y] coordinates of this widget. This parameter is only required if the master object has a grid layout.
horizontal	boolean	False	-	Whether the buttons stack vertically or horizontally. (Defaults to vertical)
visible	boolean	True	No	If the widget should be visible.
enabled	boolean	None	No	If the widget should be enabled. If None (the default) the enabled property will be inherited from the master
width	size	None	No	Set the width of the widget in characters or to "fill"
height	size	None	No	Set the height of the widget in characters or to "fill"

Methods

You can call the following methods on an ButtonGroup object.

Method	Takes	Returns	Description
append(option)	item (string)	-	Appends a new option to the end of the ButtonGroup.
after(time, command, args=None)	time (int), command (function name), args (list of arguments)	-	Schedules a single call to command after time milliseconds. (To repeatedly call the same command, use repeat())
cancel(command)	command (function name)	-	Cancels a scheduled call to command
destroy()	-	-	Destroys the widget
disable()	-	-	Disables the widget so that it is "greyed out" and cannot be interacted with
enable()	-	-	Enables the widget
focus()	-	-	Gives focus to the widget
get_group_as_list()	-	list	Returns a list containing all of the text/hidden value pairs from the ButtonGroup (useful for debugging)
hide()	-	-	Hides the widget from view. This method will unpack the widget from the layout manager.
insert(index, option)	index (int), option (string)	-	Insert a new option in the ButtonGroup at index
remove(option)	item (string)	Boolean	Removes the first option from the ButtonGroup. Returns True if an item was removed.
repeat(time, command, args=None)	time (int), command (function name), args (list of arguments)	-	Repeats command every time milliseconds. This is useful for scheduling a function to be regularly called, for example updating a value read from a sensor.
resize(width, height)	width (int), height (int)	-	Sets the width and height of the widget
show()	-	-	Displays the widget if it was previously hidden
update_command(command, args =None)	command (function name), args (Optional List of arguments to be passed to command)	-	Updates the function to call when the selected option changes

Properties

You can set and get the following properties:

Method	Data type	Description
align	string	The alignment of this widget within its container
bg	color	The background colour of the widget
children	List	A list of the widgets in this container. [RadioButton, *]
enabled	boolean	True if the widget is enabled
font	string	The font of the text
grid	List	[x,y] coordinates of this widget. This parameter is only required if the master object has a grid
height	size	Set the height of the widget in characters or to "fill"
master	App or Box	The container to which this widget belongs
value	string	The hidden value associated with the currently selected option
value_text	string	The text associated with the currently selected option
visible	boolean	If this widget is visible
width	size	Set the width of the widget in characters or to "fill"
text_size	int	The size of the text
text_color	color	The colour of the text
tk	tkinter.Frame	The internal tkinter object, see Using tkinter

Refer to a property as <name of widget>.property. For example, if your ButtonGroup object is called choice you would write choice.value.

You can set the property (for example choice.value = "2") or get the value of the property to use (for example print(choice.value)).

Examples

Creating a ButtonGroup with a 2D list

If you want to create a ButtonGroup object with your own hidden values you can specify a 2D list of options:

from guizero import App, ButtonGroup, Text

def update_text():
    what_is_selected.value = activities.value

app = App()
activities = ButtonGroup(app, options=[
                              ["Roller Skating", "skate"],
                              ["White water rafting", "WWR"],
                              ["Mountain climbing", "climb"]
                            ],
                            selected="skate", command=update_text)

what_is_selected = Text(app, text="skate")
app.display()

Using ButtonGroup tk widgets

Advanced users can gain internal access to the internal tkinter widgets used by ButtonGroup. For more information on using tkinter in combination with guizero see Using tkinter.

The ButtonGroup widget contains a tkinter.Frame object, which frames multiple guizero RadioButton widgets. Each RadioButton widget contains a tkinter.Radiobutton object.

The .children property returns the list of RadioButton widgets in the order they appear in the ButtonGroup:

To access the internal RadioButton tk object you would use the child's tk property e.g.

button_group = ButtonGroup(app)

for radio_button in button_group.children:
    tk_radio_button = radio_button.tk