Python file operations

Python's function to read and write files is open or file

File_handler = open (Filename,,mode)

Table mode

Mode	Describe
R	Open the file as read to read the file information.
W	Open a file in write mode to write information to the file. If the file exists, empty the file, and then write the new content
A	Open a file in Append mode (that is, an open file, the file pointer is automatically moved to the end of the file), and if the file does not exist, create
r+	The file can be read and written by opening the file in read/write mode.
w+	Remove the file contents, and then open the file as read-write.
A +	Open the file in read-write mode and move the file pointer to the end of the file.
B	Open the file in binary mode instead of in text mode. This mode is only valid for Windows or DOS, and Unix-like files are operated in binary mode.

Table File Object Methods

Method	Describe
F.close ()	Close the file, remember to open the file after opening () must remember to close it, otherwise it will occupy the system open file handle number.
F.fileno ()	Gets the file descriptor, which is a number
F.flush ()	Refresh Output Cache
F.isatty ()	Returns true if the file is an interactive terminal, otherwise false.
F.read ([Count])	Reads the file, and if there is count, it reads count bytes.
F.readline ()	Read a line of information.
F.readlines ()	Reads all the lines, that is, the information that reads the entire file.
F.seek (Offset[,where])	Move the file pointer to the offset position relative to where. Where 0 indicates the beginning of the file, this is the default, 1 is the current position, and 2 means the end of the file.
F.tell ()	Gets the file pointer position.
F.truncate ([size])	Intercepts the file so that the file size is sized.
F.write (String)	Writes string strings to a file.
F.writelines (list)	Writes a string in a list to a file in a row, and writes the file continuously without wrapping.

Read the file

Read = open (Result)
Line=read.readline ()
While line:
Print Line
Line=read.readline () #如果没有这行会造成死循环
Read.close

Write a file

Read = File (result, ' A + ')
Read.write ("\ r \ n")
Read.write ("Thank You")
Read.close

Other

#-*-encoding:utf-8-*-filehandler = open (' C:\\111.txt ', ' R ') #以读方式打开文件, RB is binary (tablet or executable file, etc.)

print ' Read () function: ' #读取整个文件 print Filehandler.read ()

print ' ReadLine () function: ' #返回文件头, read one line filehandler.seek (0) print filehandler.readline ()

print ' ReadLines () function: ' #返回文件头, returns a list of all rows Filehandler.seek (0) print filehandler.readlines ()

print ' List all lines ' #返回文件头, show All Rows Filehandler.seek (0) textlist = filehandler.readlines () for line in text List:print Line, print print

print ' Seek function ' #移位到第15个字符 to display the remainder from 16 characters filehandler.seek () print ' Tell () function ' Print Fileh Andler.tell () #显示当前位置 print filehandler.read ()

Filehandler.close () #关闭文件句柄

Python file operations