Python

Python has been installed by default in Linux, but it has a lower version, such as default to Python2.6.6 on Centos6.3Here I reinstall Python3.4.4, download from official website Python3.4.4Unzip the file,tar zxvf python-3.4.4.tgzCompiling the

How class members are accessed#!/usr/bin/env python# _*_coding:utf-8 _*_class pepole (object): ' This is __doc__ information!!! ' Country = "China" #静态字段 exists in class __city = "Beijing" #私有静态字段 def siyou (self): #私有字段在内部设置方法可以访问 return Pepo

Section 1 Chaptersabout the Python the question and answer?If you have bought this book, you may already know Python what is and why it is an important tool worth learning. If you don't know yet, you may not be fascinated by pythonuntil you learn

Section2ChaptersPythonHow to run a programThis chapter and the next chapter will look at the execution of the program-that is, how you begin to write code, and Python how to run it. In this chapter, we will look at how the Python interpreter

Although I have seen a lot of Python video before, but have no motivation and courage, so did not insist and did not learn so deep, this time through the Python automation training, can completely change themselves, through the first day of Python

Format Print1)%s: Represents a String2)%d: Represents an integer3)%f: Represents floating point number1. Format Printing 1Name = "Xiaoming" age = 29job = "IT" Print ("I am%s,age:%d,job:%s"% (name,age,job))2. Format Printing 2msg = ' Information of%s

Can already be simple for Excel after the operationCan start writing test cases through ExcelRead use case execution casesWrite well in advance execlHere's the code:1 #!/usr/bin/env python2 #-*-coding:utf_8-*-3 4 Importxlrd5 ImportRequests6 ImportRe7

To parse a class in Python:#!/usr/bin/env python#-*-coding:utf-8-*-classGrandpa:def __init__(self):Print('i\ ' m Grandpa')classFather (Grandpa):def __init__(self):Print('i\ ' m father')classSon (Father):"""A Simple Example Class!!! """I= 12345def

2nd ChapterHow Python Runs the program?This chapter and the next chapter will take a quick look at the execution of the program-how you start the code, and how Python runs it. In this chapter, we'll look at how the Python interpreter executes the

1. Check if the list is emptyThere is no need to call the Len method to detect if a list is empty, because an empty list evaluates to False.if Len (mylist): # Do something with my list Else : # The list is emptyYou can use the following

Import warningsWarnings.filterwarnings ("Ignore") # if there is no line code, a warning prompt appears: userwarning:discarded range with reserved name The reason Warnings.warn ("discarded range with reserved name") is that some other settings in

Source of the topic https://leetcode.com/problems/remove-duplicates-from-sorted-list/Given a sorted linked list, delete all duplicates such this each element appear only once.For example,Given 1->1->2 , return 1->2 .Given 1->1->2->3->3 ,

A Manager returned by manager () would support types list, dict, Namespace, Lock, Rlock, Semaphore, Boundedsemaphore, Condit Ion, Event, Queue, Value and Array. For example,From multiprocessing import Process, Managerdef f (D, L):D[1] = ' 1 'd[' 2 ']

Recursive functions-------functions inside a function that can call itselfDefine a function that calculates the factorial fact (n):Fact (n) = n! = 1 x 2 x 3 x ... x (n-1) x n = (n-1)! X n = fact (n-1) x nFunctions can be written as:>>> def fact (n):

Rehat 6.5 Installation python2.7.11 (2.6 already exists in the system)wget HTTPS://WWW.PYTHON.ORG/FTP/PYTHON/2.7.11/PYTHON-2.7.11.TAR.XZtar [J]XVF python-2.7.11.tar.xzCD

Import sockettarget_host = "127.0.0.1" Target_port = 9999client = Socket.socket (socket.af_inet,socket. Sock_stream) Client.connect ((Target_host,target_port)) client.send ("get/http/1.1\r\nhost:baidu.com\r\n\r\n") Response = CLIENT.RECV (4096)

Test the tool-use the Douban API to crawl the Douban film top250 and test the top250 Recently, I have to climb something. For Douban, it provides APIs for developers. Currently, it is in v2 version. Currently, keys are not open to individuals, but

Several suggestions on the Python set and several suggestions on python   1. Check whether the list is empty There is no need to call the len method to check whether a list is empty, because the empty list is evaluated as False. if len(mylist): #

Detailed knowledge about Python string slicing, I. number of characters in the string Print "Hello" [0] indicates the first character in the output stringPrint "Hello" [-1] indicates the last character in the output string Ii. string

Python uses the mechanism module to compile the main points of crawler analysis, pythonmechanism The Mechanism is a replacement of some functions of urllib2, which can better simulate browser behavior and comprehensively implement web access control.