If characters in label are preceded by an underscore, they are underlined.
If you need a literal underscore character in a label, use “__” (two
underscores). The first underlined character represents a keyboard
accelerator called a mnemonic. Pressing <kbd>Alt</kbd> and that key
activates the button.
Creates a new gtk.button.Button containing a label.
If characters in label are preceded by an underscore, they are underlined. If you need a literal underscore character in a label, use “__” (two underscores). The first underlined character represents a keyboard accelerator called a mnemonic. Pressing <kbd>Alt</kbd> and that key activates the button.