Python如何把字符串加到文件行首？

netdzb

1. fo = open("01.txt","r+")
   
2. fo.seek(0, 0)
   
3. fo.write('coding.\n')
   
4. fo.close()

复制代码

我已经移动了文件指针了，还是把字符串加到了文件尾。

regabc

with open('new.txt', 'r+', encoding='utf-8') as fp:
con = fp.read()fp.seek(0)
fp.write('Hello world\n'+con)