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文件操作
Character Meaning
'r' open for reading (default)
'w' open for writing, truncating the file first
'x' create a new file and open it for writing
'a' open for writing, appending to the end of the file if it exists
'b' binary mode
't' text mode (default)
'+' open a disk file for updating (reading and writing)
'U' universal newline mode (deprecated)
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f=open(‘E:\tianqing.txt’)#打开路径文件
f.read(3)#读取三个字符
‘hel’
f.tell()#存书签
3
f.seek(45,0)#更改书签
45
f.readline()#读取一行
‘和尚和老道，老道给和尚讲故事，讲的是:\n’
新建一个可写文件
f=open(‘E:\我爱python.txt’,‘w’)
f.write(‘世界这么大，我想去看看’)
11
f.close()
打开路径下的文件，记事本上会出现修改的文字
