Python learning notes-Files

ArticleDirectory

• OS module attributes
• File object Method
• OS module File/directory access function
• Path Name access function in the OS. Path Module

OS module attributes

Attribute name	Description
Linesep	String used to split rows in a file
SEP	String used to separate the file path name
Pathseq	String used to separate file paths
Curdir	String name of the current working directory
Pardir	(Current working directory) parent directory string name

File object Method

Attribute name	Description
File. Close ()	Close file
File. fileno ()	Returns the file descriptor.
File. Flush ()	Refresh the file's internal swap Zone
File. isatty ()	Determines whether the file is a tty-like device.
File. Next ()	Returns the next line of the file (similar to file. Readline (), or triggers a stopiteration exception when no other rows exist.
File. Read (size =-1)	Read size bytes from the file. When no size is specified or negative value is given, read all remaining bytes and return them as strings.
File. Readline (size =-1)	Read from the file and return a row (including the row Terminator)
File. readlines (sizhint = 0)	Reads all rows of the file and returns the result as a list (including all row Terminators ). If the given sizhint is greater than 0, the total number of rows in the sizhint bytes is returned (the size is determined by the next value of the buffer capacity)
File. Seek (Off, whence = 0)	Move the file pointer in the file, and offset off byte from whence (0 indicates the start of the file, 1 indicates the current position, and 2 indicates the end of the file)
File. Tell ()	Returns the current position in the file.
File. truncate (size = fill. Tell ())	Returns the maximum size of the file. The default value is the current file location.
File. Write (STR)	Write a string to a file
File. writelines (SEQ)	Writing string sequence seq to a file

OS module File/directory access function

Method	Description
File Processing
Mkfifo ()/mknod ()	Create named pipelines/create files/file system nodes
Remove ()/unlink ()	Delete an object
Rename ()	Rename a file
Stat ()	Returned File Information
Symlink ()	Create a symbolic link
Utime ()	Update Time cut
Tmpfile ()	Create and open a new temporary file
Walk ()	Generate all file names under a directory tree
Directory/folder
Chdir ()	Change current working directory
Chroot ()	Change the root directory of the current process
Listdir ()	List objects in a specified directory
Getcwd ()	Back to current working directory
Mkdir	Create (multi-tier) Directories
Rmdir	Delete (multi-tier) Directories
Access/permission
Access ()	Verify permission Mode
Chmod ()	Change permission Mode
Chown ()	Change owner and group ID
Umask ()	Set the default permission Mode
File descriptor operations
Open ()	Underlying operating system open
Read/write ()	Seek/Write Data Based on file descriptors
DUP ()/dup2 ()	Copy file descriptor/function is the same, but will be copied to another file descriptor

Path Name access function in the OS. Path Module

Method	Description
Separate
Basename ()	Remove the directory path and return the file name.
Dirname ()	Remove the file name and return the directory path.
Join ()	Combine the separated parts into a path name
Split ()	Returns the (dirname (), basename () tuples.
Splitdrive ()	Returns the (drivename, pathname) tuples.
Information
Getatime ()	Returns the last access time.
Getctime ()	Returns the file creation time.
Getmtime ()	Returns the last file modification time.
Getsize ()	Size of the returned file (in bytes)
Query
Exists ()	Whether the specified file or directory exists
Isabs ()	Absolute path?
Isdir ()	Is it a directory?
Isfile ()	Is it a file?
Islink ()	Symbolic Link or not
Ismount ()	Whether it is a mount point
Samefile ()	Whether the two pathnames point to the same file

Delete a directory continuously. For example, a folder contains a directory B, c folder, and C folder contains test.txt.

 
Import shutilshutil. rmtree (r 'd: \ ')