New in version 2.0.
True when expr is component with LilyPond command mark attached:
abjad> note = Note("c'4")
abjad> marktools.LilyPondCommandMark('stemUp')(note)
LilyPondCommandMark('stemUp')(c'4)
abjad> marktools.is_component_with_lilypond_command_mark_attached(note)
True
False otherwise:
abjad> note = Note("c'4")
abjad> marktools.is_component_with_lilypond_command_mark_attached(note)
False
Return boolean.