if len(parts[1]) == 0:
# there is no non-whitespace data after the comma
raise ValueError("Found a comma, but no names given: \"%s\" -> %r." % (text, parts))
if len(parts[1]) == 0:
# there is no non-whitespace data after the comma
raise ValueError("Found a comma, but no names given: \"%s\" -> %r." % (text, parts))