Python

This example describes how Python uses Scrapy to crawl Web site sitemap information. Share to everyone for your reference. Specific as follows: Import refrom scrapy.spider import basespiderfrom scrapy import logfrom scrapy.utils.response import

Mako is a high-performance Python template Library whose syntax and APIs draw on many other template libraries, such as Django, JINJA2, and so on. Basic Usage The most basic way to create a template and render it is to use the template class: From

Recently, when doing the game service layering, I always wanted to separate MySQL access into a separate service dbgate for the following reasons: Request collapse to Dbgate, can make dbgate stateless, convenient scale-out When the volume

The example in this paper describes how the Scrapy custom pipeline class implements the method of saving the collected data to MongoDB. Share to everyone for your reference. Specific as follows: # Standard Python Library imports# 3rd party

ProtocolLike a server, it is implemented by this class. Let's look at a short routine: From twisted.internet.protocol import protocolfrom sys import stdoutclass Echo (protocol): def datareceived (self, Data): stdout.write (data) In this

The main analysis in this paper is the code of the web.py library application.py this module. In general, this module implements the WSGI compatible interface so that applications can be called by the WSGI application server. WSGI is the

Microsoft recently out of a Bing desktop, use down or good, can change the Bing home page of Beijing as a daily wallpaper, but the software has a bad thing is that after the installation of a search box on the desktop appears, is annoying, and can

Test steps1. Import the UnitTest module Import UnitTest 2. Write the test class inheritance unittest. TestCaseClass Tester (UnitTest. TestCase) 3. Methods for writing tests must begin with testdef test_add (self)def test_sub (self) 4. Test the

In the Python standard library, there are many functools in the library, and partial objects is one of them, which is the modification of the default value of the method parameter. Let's look at the simple application test below. Copy CodeThe code

Python fnmatch is really worry, compared to the Java filenamefilter, it is so much better, you do not need to implement what interface. Fnmatch with Os.walk () or Os.listdir (), you can do too much, and it's quite easy to use. # coding:utf-8 ""

This article describes a method for Python to output all of the text in a PowerPoint (PPT) file. Share to everyone for your reference. The specific analysis is as follows: The following code relies on Windows COM, so it is very useful to have

Despite the popularity and popularity of Django, some developers still think of her as an outdated web development framework that is only suitable for content-rich Web applications. Yet most web programs are often not rich in content, which seems to

The examples in this article describe the use of static variables for Python classes. Share to everyone for your reference. The specific analysis is as follows: The purpose of this static variable is to implement a static queue in the class, which

SMTP is used to send mail, if you want to receive mail? The message is to write a MUA as a client, from the MDA to get the mail to the user's computer or mobile phone. The most commonly used protocol for receiving mail is the POP protocol, the

The example in this article describes how Python implements the reverse lookup of host names based on IP addresses. Share to everyone for your reference. Specific as follows: Import sys, sockettry: result = Socket.gethostbyaddr ("66.249.71.15")

A database table is a two-dimensional table that contains multiple rows and columns. If the contents of a table are represented by a Python data structure, you can use a list to represent multiple rows, and each element of the list is a tuple

Python List When I introduced the Python tuple, I used an analogy to compare it to a bag and you could store different things in the bag. The Python list is very similar to this, so its function is very similar to the function of the bag. But one

The __init__ () method is of significant significance for a total of two reasons. The first reason is that initializing in the object life cycle is the most important step, and each object must be properly initialized to function correctly. The

Let's talk about threading . In multi-threading, to ensure the correctness of shared resources, we often use thread synchronization technology.Turn some sensitive operations into atomic operations to ensure that only one thread in multiple threads

character encoding As we've already said, strings are also a type of data, but a special string is a coding problem. Because a computer can only handle numbers, if you are working with text, you must convert the text to a number before processing