Python

文件内容替换

for line in fileinput.input("filepath",inplace = 1):

　　line = line.replace("oldetxt","newtxt")

　　print line

 

修改某行

with open("foo.txt","r+") as f:

　　old = f.read()

　　f.seek(0)

　　f.write("new line\n" + old)

line before