A Radiobutton widget displays a textual string, bitmap or image together with a diamond or circular indicator, and selects one choice out of several. It has all the behavior of a simple button and, in addition, can be selected: typically several radiobuttons share a single variable, and selecting one sets that variable to the radiobutton’s value; each radiobutton also monitors the variable and automatically selects or deselects itself when the variable changes. Inherits from Widget. In addition to the standard widget options, a radiobutton accepts the options documented in the Tk radiobutton manual page, such as variable, value and command.