Exceptions?

exception urwid.ExitMainLoop?

When this exception is raised within a main loop the main loop will exit cleanly.

exception urwid.WidgetError?
exception urwid.ListBoxError?
exception urwid.ColumnsError?
exception urwid.PileError?
exception urwid.GridFlowError?
exception urwid.BoxAdapterError?
exception urwid.OverlayError?
exception urwid.TextError?
exception urwid.EditError?
exception urwid.CanvasError?