“cmd.distance” creates a new distance object between two selections.
cmd.distance(string name, string selection1, string selection2, string cutoff, string mode )
def distance(name=None, selection1="(pk1)", selection2="(pk2)", cutoff=None, mode=None, zoom=0, width=None, length=None, gap=None, label=1, quiet=1, reset=0, state=0):