1.str >>>list 

    str1 = "12345"  
    list1 = list(str1)  
    print list1  
      
    str2 = "123 sjhid dhi"  
    list2 = str2.split() #or list2 = str2.split(" ")  
    print list2  
      
    str3 = "www.google.com"  
    list3 = str3.split(".")  
    print list3  
 
 
輸出為：
 
['1', '2', '3', '4', '5']  
['123', 'sjhid', 'dhi']  
['www', 'google', 'com']
 

2.list >>>str

（1）方式一

    str4 = "".join(list3)  
    print str4  
    str5 = ".".join(list3)  
    print str5  
    str6 = " ".join(list3)  
    print str6  
 
輸出為： 
 
wwwgooglecom  
www.google.com  
www google com
 

（2）方式二

>>> juice=['orange','a','b']  
>>> content='%s'*len(juice) % tuple(juice)  
>>> print content  
orangeab  
 

轉載自：這裡