python list和string之间的转换

num = ['1' ,'2' ,'3']  ///字符串型 直接转 ",".joint(num)  1,2,3  num = [1 ,2 ,3]  ///整形首先要经历转字符串型  ",".joint([str(i)  for  i in num])  1,2,3 

https://www.cnblogs.com/klb561/p/9211268.html