contexttools.iterate_contexts_backward_in_expr¶

abjad.tools.contexttools.iterate_contexts_backward_in_expr.iterate_contexts_backward_in_expr(expr, start=0, stop=None)[source]¶

New in version 2.0.

Iterate contexts backward in expr:

abjad> staff = Staff([Voice("c'8 d'8"), Voice("e'8 f'8 g'8")])
abjad> Tuplet(Fraction(2, 3), staff[1][:])
Tuplet(2/3, [e'8, f'8, g'8])
abjad> staff.is_parallel = True

abjad> f(staff)
\new Staff <<
    \new Voice {
        c'8
        d'8
    }
    \new Voice {
        \times 2/3 {
            e'8
            f'8
            g'8
        }
    }
>>

abjad> for x in contexttools.iterate_contexts_backward_in_expr(staff):
...   x
Staff<<2>>
Voice{1}
Voice{2}

Ignore threads.

Return generator.

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