Python3学习（四）：字符串和列表和字典的相互转化

1.字符串转列表

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 

输出为：

['1', '2', '3', '4', '5']  
['123', 'sjhid', 'dhi']  
['www', 'google', 'com']  

2.列表转字符串

str4 = "".join(list3)  
print str4  
str5 = ".".join(list3)  
print str5  
str6 = " ".join(list3)  
print str6  

输出为：

wwwgooglecom  
www.google.com  
www google com  

3.字符串转换为字典：

str_test = "{'a': 1, 'b': 2}"

dict_test = eval(str)

print dict_test

4.字典转换为字符串：

dict_test = {'a': 1, 'b': 2}

str_test = str(dict)

print str_test