Python

Simulating HTTP requests is a common requirement, in Python, with HTTP module operations.1 Importhttp.client2 3 #Create an Http connection. 4HTTP = http.client.HTTPConnection ('www.baidu.com')5 #set the request, the first parameter is

Python has the widest range of web aspects to apply. Therefore, the socket is very important.To use the socket, you must introduce a socket module, so write to the beginning of the Python script1 Import SocketLearn the socket is known, is the client

Errors are varied, and in the except statement, you can capture the specified exceptionModify the code as follows:1 Importio2 3Path = R''4mode ='W'5 6 Try:7File =Open (Path,mode)8str =File.read ()9 Print(str)Ten exceptFilenotfounderror as E: One

When defining a function in Python, you can define a function by using the default value of the parameterExample:1 def Welcome (who,state='is', action='talking') :2 print(who,state,action)Call Function:1 Welcome ('Tom')Output Tom is talking1

The list generation, which is the comprehensions, is a very simple and powerful build of Python built-in that can be used to create lists.For example, to generate a list, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] you can use range(1, 11) :>>> range(1, 11)[1, 2

By mastering Python's data types, statements, and functions, you can basically write a lot of useful programs.For example 1, 3, 5, 7, ..., 99 , a list of constructs can be implemented through loops:L = []n = 1while n The first half of the list's

Inside a function, you can call other functions. If a function calls itself internally, the function is a recursive function.For example, let's calculate factorial n! = 1 x 2 x 3 x ... x n , which is represented by a function fact(n) , and you can

In Python, read the file using the Open function1 file=open (r'E:\temp\test.txt','r') 2 var = file.read ()3print(Var)4 file.close ()The first line opens the E:\temp\test.txt file, noting that the beginning of the string uses R,r to indicate that the

Question 12th:The first trigonometric number with more than 500 factors (1+2+3+4+ ...)DefFindivisionnum (num): Count =0 N=1ImportMathWhile countNum:count =0for i in Range (1,int (MATH.SQRT ( triangle (n))) +1if not triangle (n)%i:count +=2 if Int

Conditional judgmentComputers can do a lot of automated tasks, because it can make their own conditions to judge.For example, enter user age, print different content according to age, in Python program, use if statement to implementAge =If age >=:

Foundation, selection, cycle================================Foundation, selection, cycle# python>>> quit ()# Python[tab]# Python2# python2.6>>> 3+3>>> 3 + 3# VI hello.py #!/usr/bin/pythonPrint (' Hello ')Print (' World ') >

Python itself has many very useful modules that can be used immediately as soon as the installation is complete.Our built-in sys modules, for example, write a hello module:#!/usr/bin/env python# -*- coding: utf-8 -*-‘ a test module ‘__author__ =

There are two types of annotations in Python, one for general comments and one for document comments.The general comment is using # to start1 Print ('output something'# CommentMulti-line annotations in Python are also used #1 # Comment 1 2 #

In addition to HTTP modules that can emulate HTTP requests, using the Urllib module can also simulate HTTP requests, but with a relatively weak function.1 Importurllib.request2 3Opener = Urllib.request.urlopen ("http://www.baidu.com")4bytes

In Python, the variable type is fixed and cannot be modified once it is declared (in Python it should not be declared, but should be used)That's right:1 var = 12print(Var)3 var = 24print(VAR)Output variable var values, 1 and 2 in turn.Error:1 var = 1

Python implements object instance modification through shelve, pythonshelve This example describes how to modify objects through shelve in python. The specific implementation method is as follows: Import shelveshe = shelve. open ('try. she ', 'C')

Python uses the Berkeley DB database instance, pythonberkeley This article describes how to use the Berkeley DB database in python. The specific implementation method is as follows: Try: from bsddb import db failed t ImportError: from bsddb3 import

Using python to capture documents from the web, The example in this article describes how to capture documents from a URL of the Web using Python and share it with you for your reference. The specific method is analyzed as follows: The instance

Example of calculating the number of pages in a python computing book The example in this article describes how to calculate the number of pages of a book in python. It is a typical application in Python programming. Share it with you for your

Python Renren login application instance, python Renren application instance This article describes how to implement the python Renren logon application and share it with you for your reference. The specific method is as follows: Import re import