Python Study Notes (1): SYS and OS modules

Python system modules include sys, OS, glob, socket, threading, _ thread, queue, time, timeit, subprocess, Multiprocessing, signal, select, shutil, and tempfile. Most system-level interfaces are concentrated in the SYS and OS modules.

The SYS module includes:

• Platform and version information, such as SYS. Platform, SYS. maxsize, SYS. Version
• Module search path SYS. Path
• Module table SYS. modules, which contains PythonProgramModule name: module information dictionary
• Exception information, such as SYS. exc_info ()
• Command Line Parameter SYS. argv
• Standard stream, such as SYS. stdin, SYS. stdout, SYS. stderr
• Program exit Call SYS. Exit

OS module inclusion

Tasks	Tools
Shell Variables	OS. Environ
Running programs	OS. System, OS. popen, OS .exe CV, OS. spawnv
Spawning Processes	OS. Fork, OS. Pipe, OS. waitpid, OS. Kill
Descriptor files, locks	OS. Open, OS. Read, OS. Write
File Processing	OS. Remove, OS. Rename, OS. mkfifo, OS. mkdir, OS. rmdir
Administrative Tools	OS. getcwd, OS. chdir, OS. chmod, OS. getpid, OS. listdir, OS. Access
Portability tools	OS. SEP, OS. pathsep, OS. curdir, OS. Path. Split, OS. Path. Join
Pathname tools	OS. Path. exists ('path'), OS. Path. isdir ('path'), OS. Path. getsize ('path ')

 

In the sys and OS modules, operations related to Python programs include:

• OS. getcwd (): obtains the current path when the script is running.
• OS. chdir (): change the path
• SYS. Path: Search Path of the module used in the storage Program
• SYS. argv: the parameter of the python program in the command line running state. The first parameter is always the name of the Python script.
• OS. Environ: a dictionary for storing shell variables. The content is stored in key-value format.