[Python] OS module

brief introduction

OS(operating system) The module is mainly used for the interface between the program and the operating system , For example, common path operations 、 Process management 、 Environmental parameters, etc

Common functions

os.sep

Returns the delimiter of the corresponding operating system file path
Windows The separator of the file path on is \,Linux On the other hand /

os.path.exists()

Judge whether the file or path in brackets exists , There is returned TRUE, There is no return FALSE

import os
if os.path.exists(r'C:\Users\Administrator\Desktop'):
print(r'C:\Users\Administrator\Desktop Directory exists ')

os.makedirs()

Recursively create directories in digital permission mode , Default permissions 0777（ octal ）
If the directory already exists, an error will be reported

import os
path = r'C:\Users\Administrator\Desktop\tmp\1'
# Create directory recursively jurisdiction 0755
os.makedirs(path, 0o755)

os.system()

By invoking the system command line mode , Execute the corresponding system command
stay Unix On , The return value is the exit state of the process , stay Windows On , The return value is the system shell The value returned by the program after running the command .

import os
# Open the system calculator 
os.system('calc')