用Google搜了半天也没有解决的办法,搜到在stack overflow上有同样问题的人,不过那个人是Linux系统,而我是windows 7 ,试着弄了一下也没弄好DEPRECATION: The default format will switch to columns in the future. You can use --format=(legacy|columns) (or define a format=(legacy|columns) in your pip.conf under the [list] section) to disable this warning.