[已解决]'str' object does not support item assignment??

yuanyangxin

1. f=open(r'/Users/Yuan_YangXin/Desktop/somefile.txt')
   
2. lines=f.readline()
   
3. f.close()
   
4. lines[1]="isn't a\n"
   
5. f=open(r'/Users/Yuan_YangXin/Desktop/somefile.txt','w')
   
6. f.writelines(lines)
   
7. f.close()

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报错：

1. Traceback (most recent call last):
   
2.   File "/Users/Yuan_YangXin/PycharmProjects/io/change214.py", line 4, in <module>
   
3.     lines[1]="isn't a\n"
   
4. TypeError: 'str' object does not support item assignment
   

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为什么改不了第一行的内容呢？求大佬指导

最佳答案

月排行榜 / 总排行榜

ba21

2017-8-13 22:43:32

1. lines=[]
   
2. f=open(r'1.txt')
   
3. for line in f:
   
4.     lines.append(line)
   
5. f.close()
   
6. 
   
7. 
   
8. lines[1]="isn't a\n"
   
9. 
   
10. f=open(r'1.txt','w')
    
11. f.writelines(lines)
    
12. f.close()
    

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跳转到最佳答案楼层

ba21

1. lines=[]
   
2. f=open(r'1.txt')
   
3. for line in f:
   
4.     lines.append(line)
   
5. f.close()
   
6. 
   
7. 
   
8. lines[1]="isn't a\n"
   
9. 
   
10. f=open(r'1.txt','w')
    
11. f.writelines(lines)
    
12. f.close()
    

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