Write expr to pdf file_name:
abjad> note = Note("c'4")
abjad> iotools.write_expr_to_pdf(note, 'one_note.pdf') # doctest: +SKIP
Write expr to pdf file_name with template:
abjad> note = Note("c'4")
abjad> iotools.write_expr_to_pdf(note, 'one_note.pdf', template='paris') # doctest: +SKIP
Return none.