New in version 2.0.
Get n th leaf in thread from leaf:
abjad> staff = Staff(2 * Voice("c'8 d'8 e'8 f'8"))
abjad> pitchtools.set_ascending_named_diatonic_pitches_on_nontied_pitched_components_in_expr(staff)
abjad> f(staff)
\new Staff {
\new Voice {
c'8
d'8
e'8
f'8
}
\new Voice {
g'8
a'8
b'8
c''8
}
}
abjad> for n in range(8):
... print n, leaftools.get_nth_leaf_in_thread_from_leaf(staff[0][0], n)
...
0 c'8
1 d'8
2 e'8
3 f'8
4 None
5 None
6 None
7 None
Return leaf or none.