File attributes

File.fileno (): file descriptor file.mode: file opening permission file.encoding: file encoding format file.closed: whether a file is closedCopy the code

Standard file

Stdin: file standard input sys.stdout: file standard output sys.stderr: file standard errorCopy the code

File command line arguments

sys.argv
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Encoding format of the file

  1. U “uses unicode encoding format
  2. Use the Codecs module to provide methods to create files that specify the encoding format
  3. Function: codecs. Open (fname, mode, encoding, error, the buffering)
  4. Mode: enable mode
  5. Encoding: Indicates the encoding format

The file system

Open the file using the OS module

os.open(filename, flage [, mode])

  • Flage is defined as follows
  • O_CREAT: creates a file
  • O_RDONLY: open in read-only mode
  • O_WRONLY: open in write mode only
  • O_RDWR: The read/write mode is enabled
  • Os. read(fd,buffersize): Reads the file
  • Os. write(fd,string): Writes files
  • Os.lseek (fd,pos.how): File pointer operation
  • Os.close (fd): closes the file