def get_astral(astral_id, structure=True, pdir="/tmp/structures"):
"""Returns a PDB structure downloaded from the astral ftp server"""
from hpf.pdb.astral import AstralList
al = AstralList(pdir=pdir, sdir=pdir, obsolete_pdb=True)
if structure:
return al.retrieve_astral(astral_id)
else:
return al.retrieve_astral_file(astral_id)
