import pyvo
import vohelper

svc = pyvo.ssa.SSAService("http://dc.g-vo.org/theossa/q/ssa/ssap.xml?")
for ct, result in enumerate(
    svc.search(pos=None, diameter=None, t_eff="70000/100000",
      log_g="4.5/5.5", w_N="0.015/+Inf",
      FORMAT="VOTable")):
  result.cachedataset()
  if ct==2:
    break

As an extra: Can you figure out how to send the thing to TOPCAT via SAMP?