Common functions in OS. Path

Document directory

• OS. Path. abspath (relative_path)
• OS. Path. relpath (path [, start])
• OS. Path. basename (PATH)
• OS. Path. dirname (PATH)
• OS. Path. Split (PATH)
• OS. Path. Join (path1 [, path2 [,...])
• OS. Path. normpath (PATH)
• OS. Path. exists (PATH)
• OS. Path. Walk (path, callback, ARG)

OS. Path. abspath (relative_path)

Returns the absolute path.

Abspath = normpath (join (OS. getcwd (), relative_path ))

Sample:

The current path is/home/justtest, then:

abspath('./code/test.py') => '/home/justtest/code/test.py

OS. Path. relpath (path [, start])

Returns the relative path. The default value of start IS OS. curdir.

Assume that the current path is/home/justtest.

relpath('/home/justtest/test.py') => 'test.py'relpath('/home/anothertest/test.py', '/home/anothertest') => 'test.py'

OS. Path. basename (PATH)

Returned file name

Basname (PATH) = Split (PATH) [1]

basename('/home/justtest/test.py') =>'test.py'basename('/home/justtest/') =>''

OS. Path. dirname (PATH)

The returned directory name, excluding the file name. Note: The returned path name does not contain the last slash.

Dirname (PATH) = Split (PATH) [0]

dirname('/home/justtest/test.py') =>/home/justtest'dirname('/home/justtest/') =>'/home/justtest'

OS. Path. Split (PATH)

Break the path into (path, file name)

split('/home/justtest/test.py') = ('/home/justtest', 'test.py')split('/home/justtest/') = ('/home/justtest', '')

OS. Path. Join (path1 [, path2 [,...])

Merge multiple paths

join('/home', 'justtest', 'test.py') => '/home/justtest/test.py'join('/home/justtest', 'test.py') => '/home/justtest/test.py'

OS. Path. normpath (PATH)

Normalize paths: Remove unnecessary delimiters, convert "..." to "True paths", and handle incorrect slashes.

normpath('\home/justtest') => '\\home/justtest'normpath('/home/./justtest') => '/home/justtest'normpath('/home/../justtest') => '/justtest'

OS. Path. exists (PATH)

Whether the file or path exists and has the permission to access it

OS. Path. isabs (PATH), isfile (PATH), isdir (PATH), islink (PATH)

Isabs: whether the path is absolute

Isfile: whether to file

Isdir: path?

Islink: whether to link

OS. Path. Walk (path, callback, ARG)

Traverses the path and calls the callback function for each file in the path.

The following is a prototype of the callback function:

Callback (ARG, path, files) @ Arg: parameter of the walk function @ path: path @ files: All files in the path

The following code prints all file names in the current directory:

from os.path import *def walk_callback(arg, path, files):for file in files:print join(path, file), argwalk('.', walk_callback, 'hello from walk')