Python

Python string common methods of operationPython string operations commonly used operations, such as string substitution, deletion, interception, copying, connection, comparison, search, segmentation, etc., the need for friends can refer to.1. Remove

Position parameter position parameter must correspond to formal parameter one by onedef # A, B is the positional parameter Print (a) Print (b) Test (+)The keyword parameter is independent of the formal parameter orderdef Test (x, y) Print (

1.shell Crawler Examples:[Email protected] ~]# vim pa.sh #!/bin/bashwww_link=http://www.cnblogs.com/clsn/default.html?page=for i in {1..8 }doa= ' Curl ${www_link}${i} 2>/dev/null|grep homepage|grep-v "ImageLink" |awk-f "[> >bb.txt ' #@ the

Import UnitTestFrom time import sleepImport OSFrom selenium import WebdriverImport Win32APIImport Win32conImport Win32clipboard as Cutdef shearplate (copystring):Cut. OpenClipboard ()Cut. EmptyClipboard ()Cut. SetClipboardData (Win32con.

Today, we introduce a very useful Python crawler library,--beautifulsoup4. BEAUTIFULSOUP4 's Chinese document reference URL is: http://beautifulsoup.readthedocs.io/zh_CN/v4.4.0/First use PIP to install this library, of course, also use lxml this

#Tuple Concept: An ordered set of immutable elements#the difference between a and a list is that tuple elements cannot be modified#definition#the notation of an element#(666,)t = (666,)#correct wordingt = (666)#wrong notation, parentheses as

Python day9 Batch management toolCatalog file: (Python3 program)GitHub Link: https://github.com/Liang2580/python_day9[[email protected] home]#Tree python_day9/python_day9/├──bin│├──aa│├──cc│├──__init__. py│└──main.py # Main program Entry

One, the benefits of the module1, Improve maintainability2, REUSABLE3, avoid conflicting function names and variable namesSecond, the module classification Built-in standard module (also known as standard library) execution help (' modules '

And: If the expression is not false, the value of the last expression is returned, and if the first expression is false, the value is false. (the value of this expression is returned when a false expression is encountered)Or: If both are false, the

UnitTest is the unit test framework for Python,Similar to the testng inside Java.From time import sleepFrom selenium import WebdriverImport UnitTestClass UnitTest (UnitTest. TestCase):# UnitTest class Inherits Unittest.testcase classdef setUp (self):

in order to further improve their python programming level, while strengthening their own supervision, will be from the Python advanced programming, Python Data Analysis Foundation, Python web crawler, Python-selenium automated testing and other

Variable number of arguments when function definition1 def f (*args,**myvars):2 print args3 print Myvars.items ( )4 F (1,2"Peng""China ")Output:1 (12)2 [('name'Peng '), ('Nation'' China')]an asterisk that represents the position Argument, for

1 defCalc (A, b):2res=a/b3 returnRes4 defMain ():5Money=input ('Enter how much money:')6Months=input ('A few more months:')7 Try:8res=Calc (int (money), int (months))9 exceptZerodivisionerror as E:#if the code inside the try is wrong, go

New Year, document update continue ~First, What is an operator? We have previously defined variables, which are used to store the data, and the data is stored for the operation, and the operation uses the operatorTo give a simple example 4 +5 = 9 .

Python Basic data typeThe self-band method of sequence type1. List of common methods2. Common methods of the Yuan Zu3. Common methods of strings1. List of common methodsL.append (obj) #在列表末尾添加新的对象L. Clear () #清空列表L. Copy () #复制列表, not the same

. Meta character Description . Represents any character | Logical OR operator [ ] Match any of the inner characters or sub-expressions [^] For

Use of Regular Expressions in python, python Regular Expressions This article describes the symbols and methods of python regular expressions. Findall: searches for all matches and returns the list of all combinations.Search: searches for the first

Cookie and session, cookiesessionCookie and session 1. cookie Cookies are key-value pairs stored locally in the browser. It is included in the Response Header during transmission between the browser and the server. You can set cookies on both the

Python garbage collection mechanism and python garbage collection There are three main Python garbage collection mechanisms. The first is to use the reference count to track and recycle garbage.For reference problems, we use the mark-clear method.

Python implements a script to remotely shut down the computer using 163 mailbox, python163 After learning Python for a week, I wrote the code very rough, just to use the 163 mailbox Remote Computer shutdown function. Send the Code directly. To run