Expanding on my previous answer, I found a way to save printlevel and
restore it when I'm done. The key idea is try to get a handle to a
function that may not exist, then create it if it doesn't:
from sage.libs.singular.function import singular_function, lib
lib('normal.lib')
normal = singular_function('normal')
execute = singular_function('execute')
try:
get_printlevel = singular_function('get_printlevel')
except NameError:
execute('proc get_printlevel {return (printlevel);}')
get_printlevel = singular_function('get_printlevel')
saved_printlevel = get_printlevel()
execute('printlevel=-1')
pols_in_S = normal(S.ideal(g))[1][0]
execute('printlevel={}'.format(saved_printlevel))
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