New in version 2.6.
True when expr is a sequence of Abjad measures:
abjad> measures = 3 * Measure((3, 4), "c'4 d'4 e'4")
abjad> measures
[Measure(3/4, [c'4, d'4, e'4]), Measure(3/4, [c'4, d'4, e'4]), Measure(3/4, [c'4, d'4, e'4])]
abjad> measuretools.all_are_measures(measures)
True
True when expr is an empty sequence:
abjad> measuretools.all_are_measures([])
True
Otherwise false:
abjad> measuretools.all_are_measures('foo')
False
Return boolean.
Function wraps componenttools.all_are_components().