[willie@localhost pys]$ python3
Python 3.5.2 (default, Dec 7 2016, 23:38:49)
[GCC 4.4.7 20120313 (Red Hat 辩此轮4.4.7-17)] on linux
Type "help", "copyright", "credits" or "license" for 扒宏more information.
>>> s =[['a','b','c'],['d','e','f'],['g','h','i'],['j','k','l']]
>>> ss = 携信';'.join([','.join(i) for i in s])
>>> ss
'a,b,c;d,e,f;g,h,i;j,k,l'