New in version 2.0.
Change numeric seconds to escaped clock string:
abjad> from abjad.tools import durationtools
abjad> note = Note("c'4")
abjad> clock_string = durationtools.numeric_seconds_to_escaped_clock_string(117)
abjad> markuptools.Markup('"%s"' % clock_string, 'up')(note)
Markup('"1\'57\\""', direction='^')(c'4)
abjad> f(note)
c'4 ^ \markup { "1'57\"" }
Escape seconds indicator for output as LilyPond markup.
Return string.