Python OS module

#OS模块
#os模块就是对操作系统进行操作, the module must be imported first: Import OS#GETCWD () Gets the current working directory (the current working directory is the folder where the current file is located) result = OS.GETCWD () print (Result) # ChDir () Change current working directory Os.chdir ('/home/sy ') result = OS.GETCWD () print (result) open (' 02.txt ', ' W ') # If you write the full path when you do not need to consider the default working directory problem, according to the actual writing path operation open ('/home/sy/download/02.txt ', ' W ') #listdir () Gets the name list of all contents in the specified folder result = Os.listdir ('/home/sy ') print (Result) #mkdir () creates a folder #os.mkdir (' Girls ') #os. mkdir (' Boys ', 0o777) #makedirs () recursively Create folders # Os.makedirs ('/home/sy/a/b/c/d ') #rmdir () Delete empty directory #os.rmdir (' Girls ') #removedirs recursive delete folder must be empty directory #os.removedirs ('/home/ SY/A/B/C/D ') #rename () file or folder rename #os.rename ('/home/sy/a ', '/home/sy/alibaba ' #os. Rename (' 02.txt ', ' 002.txt ') #stat () Get information about a file or folder #result = Os.stat ('/home/sy/pycharmproject/python3/10.27/01.py) #print (Result) #system () Execute system command (dangerous function) # result = Os.system (' ls-al ') #获取隐藏文件 #print (Result) #环境变量 "environment variable is a collection of commands that the operating system environment variable is the set of directories that the operating system searches for commands when executing system commands #getenv () Gets the environment variable of the system result = os.getenv (' PATH ') print (Result.split (': ')) #putenv () adds a directory to the environment variable (temporarily increasing only valid for the current script) #os. putenv (' PATH ', '/home/sy/download ') #Os.system (' syls ') #exit () The command that exits the terminal #os a common value in the module #curdir represents the current folder. Indicates that the current folder can typically omit print (Os.curdir) #pardir represent the previous level of folder: Indicates that the previous level folder cannot be omitted!print (Os.pardir) #os. mkdir ('.. /.. /.. /man ') #相对路径 find #os.mkdir ('/home/sy/man1 ') starting from the current directory #绝对路径 find #name from the root to get the name string that represents the operating system print (Os.name) #posix Linux or Unix System NT-Window System #sep get the system path interval symbol window->\ linux->/print (os.sep) #extsep get the interval symbol between the file name and the suffix Windo W & Linux. Print (OS.EXTSEP) #linesep get the line break symbol for the operating system window, \ r \ n Linux/unix, \nprint (repr (OS.LINESEP)) # Importing the OS module import os# The following are the contents of the Os.path submodule #abspath () Convert the relative path to the absolute path Path = './boys ' #相对result = Os.path.abspath (path) print ( Result) #dirname () Gets the directory part of the full path & BaseName () Gets the full path of the body part of Path = '/home/sy/boys ' result = os.path.dirname (path) Print (Result) result = Os.path.basename (path) print (result) #split () cuts a complete path into the directory part and the body part path = '/home/sy/boys ' result = Os.path.split (path) print (result) #join () merges 2 paths into one var1 = '/home/sy ' var2 = ' 000.py ' result = Os.path.join (VAR1,VAR2) Print (Result) #spLitext () cuts a path into a file suffix and two other parts, primarily for obtaining the suffix of the file path = '/home/sy/000.py ' result = Os.path.splitext (path) print (Result) # GetSize () Gets the size of the file #path = '/home/sy/000.py ' #result = os.path.getsize (path) #print (Result) #isfile () detect if the file is Path = '/home/ sy/000.py ' result = os.path.isfile (path) print (result) #isdir () detect if the folder result = Os.path.isdir (path) print (Result) # Islink () detects if the link path = '/initrd.img.old ' result = Os.path.islink (path) print (result) #getctime () Gets the creation time of the file get create times  #getmtime () Get File modification time get modify time#getatime () get the file access time get active timeimport timefilepath = '/home/sy/download/chls ' result = Os.path.getctime (filepath) print (Time.ctime (result)) result = Os.path.getmtime (filepath) print (Time.ctime (result)) result = Os.path.getatime (filepath) print (Time.ctime (result)) #exists () detects if a path exists filepath = '/home/sy/download/chls ' result = os.path.exists (filepath) print (result) #isabs () detects if a path is an absolute path, path = '/boys ' result = os.path.isabs (path) print ( Result) #samefile () detects if 2 paths are the same file path1 = '/home/sy/download/001 ' path2 = '. /.. /.. /download/0"result = Os.path.samefile (path1,path2) print (result) #os. Environ used to get and set built-in values for system environment variables import os# get system environment Variables getenv () Effect Print (os.environ[' path ') #设置系统环境变量 putenv () os.environ[' path '] + = ':/home/sy/download ' Os.system (' CHLs ')

Python OS module