Label.setMarkupWithMnemonic

Parses str which is marked up with the [Pango text markup language][PangoMarkupFormat], setting the label’s text and attribute list based on the parse results. If characters in str are preceded by an underscore, they are underlined indicating that they represent a keyboard accelerator called a mnemonic.

The mnemonic key can be used to activate another widget, chosen automatically, or explicitly using [gtk.label.Label.setMnemonicWidget].