>>> ‘+‘.join(‘1234‘)‘1+2+3+4‘>>> ‘+‘.join(a for a in ‘1234‘)‘1+2+3+4‘>>> ‘+‘.join(a for a in ‘1234‘ if a==‘2‘)‘2‘>>> ‘+‘.join(sorted(‘4+2+1+3‘[::2]))‘1+2+3+4‘
python 字符串的处理技巧--join
原文:http://www.cnblogs.com/zhenfei/p/6674609.html