python os module tutorial

Stat. S_IRGRP: group user has Read permission 0o040 Stat. S_IRWXG: group user has full permissions (permission mask) 0o070 Stat. S_IXUSR: owner has execute permission 0o100 Stat. S_IWUSR: owner has write permission 0o200 Stat. S_IRUSR: owner has Read permission 0o400 Stat. S_irwxu: owner has full permissions (permission mask) 0o700 Stat. S_ISVTX: The file directory in the directory only the owner can delete the changes 0o1000 Stat. S_isgid: Execute this file its

Os.remove () delete the specified file Os.removedirs () delete the multi-level directory Os.rename () rename a file or directory Os.rmdir () Delete a directory OS.Setegid () Sets the active group of the current process Idos.seteuid () sets the current process's active user Idos.setgid () sets the current process's group Idos.setuid () to set the user Idos.stat for the current process () Displays details of the specified path Os.strerror () converts the error number to an information string Os.

OS module, together with a look at the common methods, that is, what functions or functions.1, OS.GETCWD ()Import os>>> os.getcwd ()'c:\\users\\tom\\appdata\\local\\programs\\python\\ Python36'Returns the directory of native-installed python.2, Os.chdir ()Change the director

The OS module is about file/directoryImport syntaxImport OSRelated methodsPath.abspath () to get the file under the current pathThe result of Os.path.abspath (' checkbox.html ') is e:/python-project/threecases/checkbox.html, but cannot be opened with a browser.You can add file:///to the front as followsFile_path = ' file:///' + os.path.abspath (' checkbox.html ')

Python OS modules are primarily operating files and directories, and are commonly used in the following ways:#1. OS.GETCWD () Gets the directory where the current file is located#2, Os.makedirs (' dirname1/dirname2 ') create a directory, can generate multi-level recursive directory#3, Os.removedirs (' dirname1/dirname2 ') Delete directory, must be empty directory#4, Os.mkdir () create a single directory#5,

Delete empty directories in the specified directory tree #! /usr/bin env pythonimport osimport sysdir =sys.argv[1]if os.path.isdir (dir): For Root,dirs,files in Os.walk (dir,topdown= False): #从最里向外遍历 for D in Dirs:if not Os.listdir (Os.path.join (root,d)): #判断目录是否为空 Os.rmdir (Os.path. Join (root,d)) Else:print '%s is not dir '%dirThe use of the Os.walk () functionFor Root,dirs,files in Os.walk (Path,topdown=true,onerro=none)Returns a ternary tuple, root for each traversed path, DIRS returns a li

Import OSImport Sys__file__ #只保存文件名 (does not contain absolute paths)Os.path.abspath (__file__) #返回绝对路径 (file name + absolute path)Base_dir = Os.path.dirname (Os.path.abspath (__file__)) #文件所在绝对路径 (file name not included)Sys.path.append (BASE_DIR) #将文件路径加入到环境变量 (!!!!!! ）#综上:Os.path.abspath () #绝对路径 + file nameOs.path.dirname () #绝对路径OS.GETCWD () #pwdOs.chdir ("path") #cd "path"Os.chdir ("..") #cd Upper LevelOs.makedirs ("Dir1/dir2") #递归创建目录Os.removedirs (' dir ') #递归删除 until the directory is not

The main time information in Ython's Os.stat is three: St_mtime,st_atime,st_ctime.1. St_mtime:time of Last modification The last modification time, if a file is written using the Write function, the time of the file is changed 2. St_atime:time of last access The last access time, if a file is read using the Read function, it will change the time of the file 3. St_ctime:time of last change the last time the file permission is modified, if you use chmod to modify the permissions of the file, t

file that exists. Otherwise returns falseos.path.isdir (path) returns True if path is a directory that exists. Otherwise returns falseOs.path.join (path1[, path2[, ...]) returns a combination of multiple paths, and the parameters before the first absolute path are ignoredos.path.getatime (path) returns the last access time of the file or directory to which path is pointingos.path.getmtime (path) returns the last modified time of the file or directory to which path is pointingos.path.getsize (pa

Basic regular expression syntax and re module in basic Python tutorial, basic python tutorial What is a regular expression: A regular expression is a pattern that can match a text clip. The regular expression 'python' can match '

Tutorial on installing Python's Pillow library on Mac OS, pythonpillow Today, I made a python tool for my friend and found that the ptyhon support library is missing in the system. The following information is returned: ImportError: No module named PILThen download and install it. Because there is no

# OS if path does not exist. path. isabs ('path') # If path is an absolute path, return True30 # OS. path. isfile ('path') # returns True if path is an existing file. Otherwise, False31 # OS. path. isdir ('path') # True is returned if path is an existing Directory. Otherwise, False32 # OS is returned. path. join (['pa

original name of the module with a custom name as JSONWhen the module is imported, the top-level code of the module is executed when it is loaded, such as setting global variables, declaring classes and functions, etc., so the code should be encapsulated in classes and functions as much as possible. a module, no matte

(_ maintype, _ subtype, ** _ params)The base class of all MIME classes, which is a subclass of the email. message. Message class. 3. class email. mime. multipart. MIMEMultipart () In the email module (Python 3.0-Python 2.3) of version 2.5, this class is located in email. MIMEMultipart. MIMEMultipart.This class is a direct subclass of MIMEBase. it is used to gene

the directory if it is empty, if the upper level is also empty, also delete, etc.# Os.removedirs (R ' a/b/c/d ')# Delete a file# Os.remove (R ' d ')# os.rename (' oldname ', ' newname ')# get file \ Directory information# Obj=os.stat (R '/users/zhangrenguo/pycharmprojects/passers-by dialogue/day18/os module. Py ')# print (obj)# The path delimiter for the current file# Print (OS.SEP)# line Delimiter# Print

First, the installation of the Paramiko module Paramiko module relies on the Pycrypto module, and Pycrypto need to compile the GCC library, but the general distribution of the source with the module. Take CENTOS6 as an example, you can directly complete the installation directly with the following command:

, this is recommended unless the module being imported needs to use sub-modules with the same name from different packages.6.4.2 reference of built-in packages When the package is structured into a sub-package (like the sound package in the example), you can use absolute imports to reference the module of the brother package. For example, if the module sound. Fil

description of all the modules in the standard library.Use the source codeFor those who want to really understand the Python language. To understand the module, can not be separated from the source code. Reading the source code is actually the best way to learn python--in addition to writing your own. Real reading is not a problem, but the problem is the source

How many times have you been stuck in a situation where you have to change someone else's code? If you're part of a development team, you're more than you want to be in this situation. However, Python has a neat debugging feature (like most other languages), which is handy in this case. This is a quick tutorial and hopefully it will make your coding life easier.1. A messy procedure For the purposes of this

() provide a module name , it returns a list of the name of the module definition (functions, classes, and variables). If no argument is supplied, it returns a list of names defined in the current module .First, let's take a look at the input sys module for use dir . We see that it contains a large list of attributes.N