python windows modules

,age): #zip to compress multiple lists together Print (NAME,SE,AG)If the list element is not as many, the loop is minimal.Map #循环帮你调用函数Filter3 modulesA python file is a module3.1 Standard ModulesStandard modules: Python comes with modules that are standard modules, which are

interpreter and gives control to the executed program.The OS.SEP variable is used primarily for separators in the system path.Windows system through is "\ \", Linux class system such as Ubuntu separator is "/", and Apple Mac OS system is ":".Iv. OS module Case code DemoSummary:OS module in the system files and directory operations used more, is also our common module, we must master the knowledge, which is a typical Python standard cross-platform mod

Since some PDF files need to be downloaded from a Web page, there are hundreds of PDF files to download, so it is not possible to download them manually. Python has the relevant modules, so I wrote a program to download the PDF file, and by the way, I was familiar with Python's Urllib module and ULRLLIB2 module. 1, the problem description A PDF file containing hundreds of papers from the http://www.cvpape

JSON and pickle modules, two modules for serializationJSON module for conversion between a string and a Python data typePickle Module for conversion between Python-specific types and Python data typesTwo modules, all available wit

modulesIn Python, the installation of a third-party module is done through the Package management tool PIP.If you are using Mac or Linux, install the PIP itself this step can be skipped.Commands for installing Pillow: PIP3 Install PillowIf you do not want to use PIP one installation time and effort, but also need to consider compatibility. Can be directly used anaconda, which is a python-based data process

In Python, common modules related to time processing are: Time,datetime,calendar (seldom used)First, in Python, there are usually several ways to represent time: Time stamp Formatted time string Tuple (Struct_time) a total of nine elements Ii. definition of severalUTC (coordinated Universal time, world co-ordination) is GMT, world standard T

Time and datetime modules in Python are modules in the temporal contextOne, Time moduleThere are three types of time-performance formats in the Times module:1, timestamp: Timestamp, time stamp represents the offset in seconds from January 1, 1970 00:00:002, Struct_time: Time tuple, a total of nine element groups.3. Format time: Formatting times, formatted structu

j in IP: # # #循环列表Myping (j)#################################################Multi-process [each process, has its own memory]Multithreading [Share a piece of memory]Multi-threaded ping host faster than above#!/usr/bin/python#coding: Utf-8Import threadingImport subprocessdef myping (x):M=subprocess.call (' ping-c2%s >/dev/null '%x,shell=true)If m==0:Print '%s is up '%xElsePrint '%s is down '%xip=[' 176.121.205.%s '%i for I in Xrange (1,254)]For-J in I

1.Python built-in modules and third-party modules Built-in modules: Python, after installing Python, has its own library, called Python's built-in library.Built-in modules

path into directory and file name two tuples returnedOs.path.dirname (PATH)#returns the directory of path. is actually the first element of Os.path.split (path)Os.path.basename (PATH)#returns the last file name of path. If path ends with a/or \, then a null value is returned. The second element of Os.path.split (path)Os.path.exists (PATH)#Returns true if path exists, false if path does not existOs.path.isabs (PATH)#returns True if path is an absolute pathOs.path.isfile (PATH)#returns True if pa

Python primarily uses the logging module for log processingMany programs have logging requirements, and the log contains information that has a normal program Access log, there may be errors, warnings and other information output, Python's logging module provides a standard log interface,You can store logs in various formats through it, logging logs can be divided into debug (), info (), warning (), error (), critical () 5 levels,Log level:DEBUGINFOWA

Regular expression crawler applications (Campus beauty net)1 ImportRequests2 ImportRe3 ImportJSON4 #定义函数返回网页的字符串信息5 defgetpage_str (URL):6page_string=requests.get (URL)7 returnPage_string.text8 9Hua_dic={}Ten defrun_re (URL): #爬取名字, school, and number of people you love OneHua_str=getpage_str (URL) AHua_list=re.finditer ('', Hua_str,re. S) - forNinchhua_list: #将名字, school, and number of favorites write a dictionary -Hua_dic[n.group ('name')]=[n.group ('School'), N.group (' like')] the