import os
env = os.environ['PATH'].split(';')#划分为list
env = [i for i in env if i !=""]#去除空值
env.sort(key = lambda x: x[0])#按照盘符排序
#....输出
import os
env = os.environ['PATH'].split(';')#划分为list
env = [i for i in env if i !=""]#去除空值
env.sort(key = lambda x: x[0])#按照盘符排序
#....输出