编辑的
好的,整个目标是在给定的物体中求出最小纬度:
>>>g.nodes
set([v99, v192, v60, v107, v54, v75, v16, v93, v190, v125, v193, v218, v114, v1, v180, v68, v11, v86, v82, v58, v166, v230, v98, v18, v20, v72, v221, v177, v36, v19, v97, v27, v206, v153, v233, v169, v88, v53, v229, v77, v50, v34, v90, v162, v106, v89,