Analysis of directory traversal examples of Python file operations

Source: Internet
Author: User
Tags file size join split

This example describes the method of directory traversal for Python file operations. Share to everyone for your reference. The specific analysis is as follows:

Python's OS module, which contains the universal operating system features, is mainly about path-dependent functions:

Os.listdir (dirname): Listing directories and files under DirName

OS.GETCWD (): Get current working directory

Os.curdir: Returns the current directory ('. ')

Os.chdir (dirname): Changing working directory to DirName

Os.path.isdir (name): Determines if name is a directory, name is not a directory returns false

Os.path.isfile (name): Determines whether name is a file, does not exist name also returns false

Os.path.exists (name): Determines whether a file or directory name exists

Os.path.getsize (name): Get file size, if name is directory return 0

Os.path.abspath (name): Get absolute path

Os.path.normpath (PATH): Canonical path string form

Os.path.split (name): Split file name and directory (in fact, if you use the directory completely, it will also separate the last directory as the filename, and it will not determine whether the file or directory exists)

Os.path.splitext (): Detach file name and extension

Os.path.join (path,name): Connecting directories with file names or directories

Os.path.basename (PATH): Return file name

Os.path.dirname (path): Back to File path

1, Os.path method

By passing in the directory that needs to be traversed, listing all the files in the directory and counting the files, the path module provided by the OS can be very flexible to the directory.

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17-18 Import Os,sys def listdir (dir,file): file.write (dir + ' n ') fielnum = 0 list = Os.listdir (dir) #列出目录下的所有文件和目录 for line in L Ist:filepath = Os.path.join (dir,line) if Os.path.isdir (filepath): #如果filepath是目录, then list all files in the directory Myfile.write (' + line + ' + ' n ') for Li in Os.listdir (filepath): Myfile.write (' +li + ' n ') Fielnum = fielnum + 1 elif os.path: #如果filepath是文件, direct columns Out filename myfile.write (' +line + ' n ') Fielnum = fielnum + 1 myfile.write (' All of the file num is ' + str (fielnum)) dir = Raw_input (' Please input the path: ') myfile = open (' List.txt ', ' W ')

2, Os.walk method

The walk method provided by the OS module is powerful enough to traverse all directories and files in a given directory.

Method: Os.walk (path), traverse path, return an object, each of his parts is a ternary group, (' Directory x ', [directory list under directory X], directory x below the file)

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1 2 3 4 5 6 7 8 9 10 11-12 Import os def walk_dir (dir,fileinfo,topdown=true): For root, dirs, files in Os.walk (dir, topdown): for name in Files:prin T (os.path.join (name)) Fileinfo.write (Os.path.join (root,name) + ' n ') for name in Dirs:print (Os.path.join (name)) Fileinfo.write (' + os.path.join (root,name) + ' n ') dir = raw_input (' Please input the path: ') FileInfo = open (' List.txt ', ' W ') Walk_dir (Dir,fileinfo)

Topdown determines the order of traversal, and if Topdown is true, first enumerates the directories under top, then directories, and so on, and vice versa, recursively enumerates the deepest subdirectories, then their siblings, and then subdirectories.

I hope this article will help you with your Python programming.

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