python os module tutorial

----------------------------------2Formerly: D:\1 ['2-1','2-2'] ['2-1.txt','2-2.txt']3----4File path under directory: D:\1\2-1. txt5File parent directory Name: 16----7File path under directory: D:\1\2-2. txt8File parent directory Name: 19----------------------------------TenFormerly: D:\1\2-1 ['3-1','3-2'] ['3-1.txt'] One---- AFile path under directory: D:\1\2-1\3-1. txt -File parent directory Name: 2-1 ----------------------------------- theFormerly: D:\1\2-1\3-1 [] ['4-1.txt'] ----- -File path

in the middle of the first root path to the last file name . * Print(Os.path.join ('c:\\','a','b','d:\\','C','D.txt')) $ Panax Notoginseng #getting the path will convert the/or \ \ - Print(Os.path.normcase ('c:/windows\\system32\\') ) the #The get path is automatically parsed. return path + Print(Os.path.normpath ('c://windows\\system32\\. /temp/') ) AA='/users/jieli/test1/\\\a1/\\\\aa.py/. /..' the Print(Os.path.normpath (a)) + Print(Os.path.dirname (Os.path.dirname (Os.path.abspath (__file_

The OS module contains common operating system features, and the following list of commonly used commands is as follows:1. Os.sep: Change the path delimiter in the operating system2. OS.GETCWD (): Gets the current path, which is more commonly used in Python code3. Os.listdir (): Lists all files and folders in the current directory4. Os.remove (): Delete the speci

returns child and parent processes (using UNIX) The Os.plock (OP) locks the program segment into memory. The value of the OP determines which segments are locked Os.wait () Waits for the child process to complete and returns a tuple that contains its PID and exit status indication: A 16-bit number whose low byte is the signal number that kills the process, its high byte is the exit state (if the signal number is 0), or if the core file is generated, a low byte high is set. Os.cpu_co

1. Directory Operations#encoding =utf-8Import Unittest,osFrom time import sleepPrint dir (OS)#获取文件路径' Get current path 'OS.GETCWD ()Os.path.abspath (")#新建目录Os.mkdir (' Test_file ')#新建多级目录# os.mkdir (' test_file\\test_1\\test_2 ')Sleep (4)#重命名目录Os.rename (' Test_file ', ' test-1_file ')f = open ('. \\test-1_file\\test.txt ', ' w+ ')F.close ()#删除目录‘‘‘Only empty directories can be deleted, if files or directories in the directory are thrown Windowserror‘

The OS module provides new/delete/view file properties for directories or files, as well as path operations for files and directories. For example: absolute path, parent directory ...OS.SEP can replace the operating system-specific path delimiter. "\ \" under Windows, "/" under LinuxThe OS.LINESEP string gives the line terminator used by the current platform. For example, Windows uses ' \ r \ n ', Linux use

The OS module provides new/delete/view file properties for directories or files, as well as path operations for files and directories. For example: absolute path, parent directory ...OS.SEP can replace the operating system-specific path delimiter. "\ \" under Windows, "/" under LinuxThe OS.LINESEP string gives the line terminator used by the current platform. For example, Windows uses ' \ r \ n ', Linux use

offset. This offset is generally calculated relative to the beginning of the file and is generally a positive number. However, if the whence parameter is provided, whence can be calculated from scratch for 0, and 1 for the current position as its origin. 2 means that the end of the file is calculated as the origin. Note that if the file is opened in a or a + mode, the file action tag is automatically returned to the end of the file each time the write operation is made.fp.truncate([size]) The f

后自动关闭文件，不过这一功能没有保证，最好还是养成自己关闭的习惯。 如果一个文件在关闭后还对其进行操作会产生ValueErrorfp.flush()#把缓冲区的内容写入硬盘 fp.fileno()#返回一个长整型的”文件标签“fp.isatty()#文件是否是一个终端设备文件（unix系统中的）fp.tell()#返回文件操作标记的当前位置，以文件的开头为原点fp.next()#返回下一行，并将文件操作标记位移到下一行。把一个file用于for … in file这样的语句时，就是调用next()函数来实现遍历的。fp.seek(offset[,whence])#将文件打操作标记移到offset的位置。这个offset一般是相对于文件的开头来计算的，一般为正数。但如果提供了whence参数就不一定了，whence可以为0表示从头开始计算，1表示以当前位置为原点计算。2表示以文件末尾为原点进行计算。需要注意，如果文件以a或a+的模式打开，每次进行写操作时，文件操作标记会自动返回到文件末尾。 fp.truncate([size])#把文件裁成规定的大小，默认的是裁到当前文件操作标记的位置。

pathPrintOs.path.relpath (filename,'/users')#get the path relative to/users#Absolute PathPrintos.path.abspath (filename)#Standardized PathsPrintos.path.normpath (filename)#get a common path in multiple pathsF1='/users/superdo/zergling/file.txt'F2='/users/superdo/ac/file.txt'f3='/users/superdo/horse/file.txt'PrintOs.path.commonprefix ([F1, F2, F3])#/users/superdo/File properties os.path.getatimeAccess time (obtained from Os.stat) os.path.getmtimeModification time (obtained from Os.s

Python's OS module is a module that is closely integrated with the operating system, which provides many more useful methods. OS.GETCWD () Gets the current working directory, which is the directory where the Python script runs Print (OS.GETCWD ())Results:/users/ssspure/pycharmprojects/file/osmodule2. Os.c

,'R') GUID= F.readlines () [1].split (': ') [1]# gets the second line of the file with ': ' Split the latterOutfile.write (GUID)# Write output filef.close ()elifOs.path.isfile (Child):# if it is a file, the extension is directly judged ifOs.path.splitext (Child) [1] = ='. Meta': F= Open (Child,'R') GUID= F.readlines () [1].split (': ') [1] Outfile.write (GUID) f.close () outfile.close ()Method Two: The above method can only traverse the level two directory, if you want to traverse the lev

(Os.path.join ("root", ' hehe ', ' haha ', ' a.log ')) #拼接成一个路径# os.path.join ("root", ' hehe ', ' haha ', ' a.log ')# Print (Os.path.split ("/usr/hehe/hehe.txt")) #分割路径和文件名# Print (Os.path.dirname ("/usr/local")) #获取父目录# Print (Os.path.basename ("/usr/local")) #获取最后一级, if it is file display file name, if it is directory display directory name# Print (os.path.exists ("/usr/local")) #目录/file is present# Print (Os.path.isabs (".")) #判断是否是绝对路径# Print (Os.path.isfile ("/usr/local")) #判断是否是一个文件# Pri

Download','6PPM in-shell pre-welding machine','Adobe','Androidstudio','Asmpg','Baiduyundownload','C # Notes','CAD','cat_200_300.jpg','Datastream.txt','Icon.png','Irisdata.txt','Lab.dat','Lbview','Lib','LVS.txt','Map.txt','Masm32','Mels','MES system data acquisition requirements Table v1.05 Chengdu, the laser sealing (laser cleaning). xlsx','MFC class diagram. PNG','Mkspecs','Mmp.txt','Mmpp.txt','MSOCache','MySQL','Open.reg','openok.reg-copy. txt','Openok.reg.txt','Plugins','pp. PNG','py','

OS module provides an interface for invoking the operating system1. Get the current path>>> Import OS>>> OS.GETCWD ()//equivalent to Linux command pwd'/root '2. Switch directories>>> Os.chdir ("/usr/local")//equivalent to Linux command CD>>> OS.GETCWD ()'/usr/local '3. Create a directory recursively>>> os.makedirs ("/a/b/c")//makedirs can achieve recursive creati

path规范化的绝对路径os.path.split(path) 将path分割成目录和文件名二元组返回os.path.dirname(path) 返回path的目录。其实就是os.path.split(path)的第一个元素os.path.basename(path) 返回path最后的文件名。如何path以／或\结尾，那么就会返回空值。即os.path.split(path)的第二个元素os.path.exists(path) 如果path存在，返回True；如果path不存在，返回Falseos.path.isabs(path) 　如果path是绝对路径，返回Trueos.path.isfile(path) 如果path是一个存在的文件，返回True。否则返回Falseos.path.isdir(path) 如果path是一个存在的目录，则返回True。否则返回Falseos.path.join(path1[, path2[, ...]]) 将多个路径组合后返回，第一个绝对路径之前的参数将被忽略os.path.getatime(path)

Python OS moduleImport OSOS.GETCWD () # The path to the working directory where the Python script is locatedOs.chdir (R '/tmp ') # switch directory to TMPOs.makedirs (R '/a/b/c ') # Create a multi-tiered folderOs.removedirs (R '/a/b/c ') #删除多层文件夹Os.mkdir ('/A ') # Create a single folderOs.listdir (' home ') # List all folders and filesOs.rename (' A ', ' B ') # M

4. Process-related processingSystem () inputs the current process into the systems shell commandImport OSif Os.name = = "NT":Command = "dir"ElseCommand = "Ls-l"Os.system (command)EXECVP start a new process to replace the current processImport OSImport Sysprogram = "Python"arguments = ["hello.py"]Print OS.EXECVP (program,) + tuple (arguments))Print "Goodbye"Perform new processes with functions such as spawn () under the Windows platformImport OSImport

), os.path.exists (path), returns True if path exists, or if path does not exist, returns Falseos.path.isabs if path is an absolute path, Returns Trueos.path.isfile (path) If path is an existing file and returns True. Otherwise, return Falseos.path.isdir (path) True if path is a directory that exists. Otherwise return Falseos.path.join (path1[, path2[, ...]) When multiple paths are combined, the parameters before the first absolute path are ignored Os.path.getatime (path) returns the last acce

OS ModuleThe OS module is simply a python system-programmed operating module that can handle files and directories that we manually need to do on a daily basis.You can view the Help documentation for the OS module:import