There are a few ways, this works:
python> import u2py
python> rec = [ 1, 2, 3, 4, 5, [ [ “s1”, “s2”, “s3”, “s4”, “s5”, “s6”, [ “s7t1”, “s7t2” ], “s8” ]], 7 ]
python> dyn = u2py.DynArray( rec )
python> dyn
<u2py.DynArray value=b’1\xfe2\xfe3\xfe4\xfe5\xfes1\xfcs2\xfcs3\xfcs4\xfcs5\xfcs6\xfcs7t1\xfbs7t2\xfcs8\xfe7’>
python> stuff = dyn.extract(6,1,7)
python> for each_text, delim in stuff:
… print(each_text)
…
s7t1
s7t2