Python (v) OS and SYS modules for common modules

One, OS module

1.os.name

The output string indicates the platform being used. If the window is ' NT ', it is ' POSIX ' for Linux/unix users.

2.OS.GETCWD ()

The function gets the current working directory, which is the directory path of the current Python script work.

3.os.listdir (' D:\python ')

Lists all files under the specified directory.

4.os.remove (' Test.txt ')

Delete a file, delete only the file

5.os.rmdir (' Test ')

Delete a folder, delete only the folder

6.os.removedirs (' Python/code ')

Delete folders recursively, note that only empty directories can be deleted

7.os.mkdir (' MLL ')

Create a folder

8.os.makedirs (' Mll/test ')

Recursive creation of folders, when creating folders, if the parent directory does not exist will automatically help you create the parent directory

9.os.sep

Take the path delimiter of the current operating system

10.os.rename (' test1 ', ' test2 ')

Rename the file test1 to Test2

11.os.stat (' homework1.py ')

Get file information

12.os.linesep

Gets the line break for the current operating system

13.os.pathsep

The delimiter for each path in the current system environment variable, Windows is;, Linux is:

14.os.environ

Environment variables for the current system

15.os.system (' ipconfig ')

Start DOS, execute operating system commands, but get no results

res = Popen (' ipconfig '). Read ()

Print (RES)

16.os.path.abspath (file)

Get file Absolute path

17.os.path.split (' d:/syz_python/code/day6/review. Py ')

Split path and file name

18.os.path.dirname (' D:/syz_python/code/day6 ')

Get the parent directory and get his top level directory

19.os.path.basename (' D:/syz_python/code/day6 ')

Gets the last level, if the file displays the filename, if the directory displays the directory name,

20.os.path.exists (' D:/syz_python/code/day6 ')

If the file/directory exists, there is a return of true, there is no return false

21.os.path.isabs (' D:/syz_python/code/day6 ')

To determine if it is an absolute path, yes to return true, not to return false

22.os.path.isfile (' xiaohei.py ')

Determine if it is a file: 1. The file must exist; 2. must be a file. Yes returns true, not just returns false

23.os.path.isdir (' D:/syz_python/code ')

Determines whether a path exists or not. Yes returns true, not just returns false

24.os.path.getsize (' homework.py ')

Get File size

25.os.path.join (' d:/', ' python/', ' MLL ', ' test.py ')

Stitching into a path

26.os.walk (R ' D:\syz_python\code\day6\test ')

Get content under Directory

Abs_path the absolute path of the current loop

Dir directory below all folders []

All files under file directory []

Second, sys module

1.sys.path

Path is a directory listing from which Python looks for third-party extensions. When Python starts, Sys.path is initialized according to the built-in rules, pythonpath variables.

2.sys.path.insert (0, ' test ')

Insert Test at the beginning of path and then import test without an error, such as introducing the other module, because the error is not added to the environment variable.

3.os.path.append (' a.py ')

Python files are also introduced into the Python environment variable, but inserted in the last

Python (v) OS and SYS modules for common modules