python os module tutorial

First, the Python OS module introductionThe 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

1105, in pasteim.load()File "/Library/Python/2.7/site-packages/PIL/ImageFile.py", line 190, in loadd = Image._getdecoder(self.mode, d, a, self.decoderconfig) File "/Library/Python/2.7/site-packages/PIL/Image.py", line 389, in _getdecoderraise IOError("decoder %s not available" % decoder_name)IOError: decoder zip not available So we need to reinstall manually: 1 sudopip instal

access time of the file or directory pointed to by path 29 OS. path. getmtime (path) returns the last modification time of the file or directory pointed to by path.View Code 5. sys1 sys. argv command line parameter List. The first element is the program Path 2 sys. exit (n) exit the program. Normally exit (0) 3 sys. obtain the version information of the Python interpreter 4 sys. the maximum Int value of ma

A few days ago did a file replacement function to use somepython osThe functionality of the Python OS module is very powerful,This module is especially important if you want your Python program to be platform-agnostic. That is, it allows a program to be written without any c

, ' 23 ', [4,5]])) # 1 or 23 or [4,5] print (Random.sample ([1, ' ", [4,5]],2)]) #列表元素任意2个组合 print (Random.uniform (1,3)) #大于1小于3的小数, such as 1.927109612082716 item=[1,3,5,7,9]random.shuffle (item) #打乱item的顺序, equivalent to "Shuffle" print (item)Third, OS module and SYS moduleAn OS module is an interface that interac

.MySQLdbDownload the MySQLdb module at the following URL: http://sourceforge.net/projects/mysql-python/In Mac OS X directly double-click Unzip, command line into the extracted directory, execute python setup.py build If there is Sh:mysql_config:command not found Tip, we need to edit the path under MySQL and use vim to

Python self-study day-Two day (1)-python environment variables, module first Knowledge and character type, python-python (1) ModuleStandard module, third-party moduleInitial module: sys

=re.compile (R ' \w*o\w* ') #匹配带o的字符串Dir (k)['copy', 'deepcopy', ' findall ', ' finditer ', ' match ', ' scanner ', ' Search ', ' split ', ' Sub ', ' Subn ']Print K.findall (test) #显示所有包涵o的字符串[' to ', ' I ', ' You ', ' from ']Print k.sub (lambdam: ' [' +m.group (0) + '] ', test) # Enclose the word containing O in the string in [].Hi, nice [to] meet [you] where is [you] [from]? examples of Python regular expressionsWhen log parsing, assume the giv

Python uses the CMD module for more elegant running scripts and pythoncmd module scripts This example describes how to use the CMD module to run scripts more elegantly in Python. Share it with you for your reference. The specific analysis is as follows: It is inconvenient to

The official explanations for the OS and SYS modules are as follows:Os:this module provides a portable the by using operating system dependent functionality.This module provides a convenient way to use the operating system functions.Sys:this module provides access to some variables used or maintained by the interpreter

"/library/python/2.7/ site-packages/pil/imagefile.py ", line, load d = Image._getdecoder (Self.mode, D, A, self.decoderconfig) File"/L ibrary/python/2.7/site-packages/pil/image.py ", line 389, in _getdecoder raise IOError (" decoder%s not available "% decod Er_name) Ioerror:decoder Zip not available So we need to reinstall manually: ? 1 sudo pip install-u Pillow 2.MySQ

file information is not stored in the file, but by the operating system.# Maintenance: information about files (such as file type, size, and modification time ). Import OS. pathPath = '/home/vamei/doc/file.txt' Print (OS. path. exists (path) # Query whether a file exists Print (OS. path. getsize (path) # query the file sizePrint (

official explanations of ? OSOs:this module provides a portable the by using operating system dependent functionality.This module provides a convenient way to use the operating system functions. ? SYSSys:this module provides access to some variables used or maintained by the interpreter and to functions that interact St Rongly with the interpreter.This

/python3.6/lib/python3.6 ' ' /usr/local/python3.6/lib/python3.6/lib-dynload ' ' /usr/local/python3.6/lib/python3.6/site-packages ']4.sys.modules ():Sys.modules () is a global dictionary that is loaded in memory after the python is started. Whenever a programmer imports a new module, Sys.modules will automatically record the module. When the

#-*-coding:cp936-*-#python#Xiaodeng#Os.path module of the Python module#http://www.cnblogs.com/dkblog/archive/2011/03/25/1995537.html" "Os.path.abspath (Path) #返回绝对路径os. Path.basename (Path) #返回文件名os. Path.commonprefix (list) #返回l

. stdout: output-related Sys. stderror: error related Progress percentage:OS Module Provides system-level operations. OS. getcwd (): Get the current working directory, that is, the directory path of the current python script. OS. chdir ("dirname"): change the current script working directory, which is equivalent to cd

__name__ = = "__main__": print Os.path.realpath (sys.argv[0]) print os.path.split ( Os.path.realpath (sys.argv[0]) print os.path.split (Os.path.realpath (sys.argv[0])) [0]Execution results 123 /home/jihite/ftp/del.py(‘/home/jihite/ftp‘,‘del.py‘)/home/jihite/ftp　 Os.path.split () separate directories and file areas 12345 >>> import os>>> os.path.split("a/b/c/d")(‘a/b/c‘,‘d‘)

This article refers to the Novice tutorial, practice using and hand-rewriting some methods, only for their own learning, for more information, please jump Beginner Tutorial: http://www.runoob.com/python3/python3-os-file-methods.html1. Verify Permission ModeOs.access (Path,mode)Parameters: Path--to be used to detect whether access is granted. Mode-Com

Brief introductionThe OS module is primarily used to provide high-level operation of the system.Common methodsSYS.ARGV command line parameter list, the first element is the program itself path Sys.modules returns the System Import module field, key is the module name, value is the