"Python" Learning note 4-os, sys module

1. OS Operating system module

1 ImportOS2 Print(OS.GETCWD ())#get current working directory3 #Print (Os.chdir (".")) #更改当前目录. Current directory: Parent Directory4 #print (os.curdir) #当前目录, relative path5 #print (os.pardir) #父目录, relative path6 #Print (Os.mkdir (' test1 ')) #创建文件夹7 Print(Os.rmdir ('d:/logs/c_/temp'),'Sdfasfasfadfaasdfad')#delete folders, only empty folders can be deleted8 #Print (Os.remove ('.. /day4/aaa.txt ')) #删除文件 cannot delete the folder9 Print(Os.listdir ('D:/zdx-code/day5'))#lists all files in the current directory, returns all folder names under the current directory listTen #Print (Os.rename (' sss.txt ', ' bbb.txta ')) #更改文件名 One #Print (Os.stat (' Notes ')) #获取文件信息 A #print (__file__) #获取当前python文件的绝对路径 - #Print (Os.path.abspath (__file__)) #获取绝对路径???  - #Print (Os.path.split ("C:\\usr\\hehe\\hehe.txt")) #分割路径和文件名 the #Print (Os.path.dirname ("C:\\usr\\hehe\\hehe.txt")) #获取父级目录 - #Print (Os.path.basename ("C:\\usr\\hehe\\hehe.txt")) #获取最后一级文件 - #Print (os.path.exists ("/usr/local")) # Directory/file exists - #Print (Os.path.isabs (".")) # Determine if it is an absolute path + #Print (Os.path.isfile ("/usr/local")) # to determine if it is a file - #Print (Os.path.isdir ("/usr/local")) # is a path + #Print (Os.path.join ("/root", ' hehe ', ' A.sql ')) # stitching into a path #使用频率高 A #Print (Os.path.getatime ("len_os.py")) # Output last access time at #Print (Os.path.getmtime ("len_os.py")) # Output last access time - # - #path1= R ' e:\\txt\day\\data ' #r ' do not recognize \ t this tab - #print (OS.SEP) # Path delimiter for the current operating system - #print (OS.LINESEP) # line break for the current operating system - #print (OS.PATHSEP) # The delimiter for each path in the environment variable of the current system, Linux is:, Windows is; in #print (Os.environ) # Environment variables for the current system - #print (os.name) # Current system Name window shows NT Linux display POSIX

 # above the key record, the job has something to do with it:
Print (OS.GETCWD ())#取当前工作目录
# Print (Os.mkdir ("Test1") #) # Create Folder
# Print (Os.remove (". /day4/5.png ") # Delete the file, you cannot erase the folder.
# Print (Os.listdir (' c://')) # list all files in one directory
# os.rename ("Test", "Test1") # Rename
# Print (Os.path.abspath (__file__)) # Get absolute path
# Print (Os.path.split ("C:\\usr\\hehe\\hehe.txt")) # Split path and file name
# Print (Os.path.dirname ("C:\\usr\\hehe\\hehe.txt")) # Get Parent Directory
# Print (os.path.exists ("C://test2")) # Directory/file exists
Print (Os.path.isfile (R "D:\meng\BestTest\code\zdx-code\day5"),' Ssssssssssssssssssssssssssssssssss ')#判断是否是一个文件
Print (Os.path.isdir (R "D:\meng\BestTest\code\zdx-code\day5"))#是否是一个文件夹
Print (Os.path.join ("E",' S.txt '))#拼接成一个路径


Os.system (' dir ') #只能用来执行操作系统命令, cannot get results
# #比如执行Linux系统命令os. System (' Ifconfig ')
Res = Os.popen (' ipconfig ') #执行操作系统命令, can get the mountain return value, use Read ()
Print (Res.read ())

# Linux Top Dynamic View performance, not with the above popen, all dynamic commands are not available, but Top-n 1 only once, you can use


2. SYS module

1 #Constants2 #Import SYS3 #print (sys.path) #环境变量4 #print (sys.platform) #看当前系统是什么系统5 #print (sys.version) #查看当前python的版本6 #print (SYS.ARGV) #是运行python文件时, gets the parameter value passed in (command line: Python filename parameter value 1 parameter value 2), (Command line argument list, first element is the program itself path) View Practice 7clear_log.py 7 #sys.exit () #退出程序, exit Normal exit (0)8 #quit (' program quit ') #跟上面一样, do not execute the following code9 #sys.version #获取Python解释程序的版本信息Ten #Sys.maxint #最大的Int值 One #Sys.path #返回模块的搜索路径, using the value of the PYTHONPATH environment variable when initializing A #Sys.platform #返回操作系统平台名称 - #sys.stdout.write (' please: ') #向屏幕输出一句话 - #val = Sys.stdin.readline () [: -1] #获取输入的值

3. Practice Clean_log

Practice Argvs, run with terminal terminal (run default without arguments directly), enter: Python filename parameter value 1 parameter value 2 empty a log file

1 ImportSys,os2 defClean_log (path):3     Print("The log is empty .")#the contents of the job supplement4 5 defback_db (db_name):6     Print("database has been backed up")7 8args = sys.argv#Argvs is run python file name parameter 1 parameter 2, list[filename, parameter 1, parameter 2, parameter 3]9 Print(args)Ten ifLen (args) >1: OnePath = Args[1] Adbname = args[2] - back_db (dbname) -     ifOs.path.isdir (path): theClean_log (args[1]) -     Else: -         Print('path does not exist! ') - Else: +     Print('running this python file requires passing in a path \ n' -           'e.g Python Clean_lpy.py/usr/tomcat/logs')

"Python" Learning note 4-os, sys module