New in version 2.6.
True when expr is a sequence of Abjad grace containers:
abjad> graces = [gracetools.Grace("<c' e' g'>4"), gracetools.Grace("<c' f' a'>4")]
abjad> voice = Voice("c'8 d'8 e'8 f'8")
abjad> grace_notes = [Note("c'16"), Note("d'16")]
abjad> grace_container = gracetools.Grace(grace_notes, kind = 'grace')
abjad> grace_container(voice[1])
Note("d'8")
abjad> f(voice)
\new Voice {
c'8
\grace {
c'16
d'16
}
d'8
e'8
f'8
}
abjad> gracetools.all_are_grace_containers([grace_container])
True
True when expr is an empty sequence:
abjad> gracetools.all_are_grace_containers([])
True
Otherwise false:
abjad> gracetools.all_are_grace_containers('foo')
False
Return boolean.
Function wraps componenttools.all_are_components().