Python

Stringio is often used as a string cache, should have a benefit for Stringio, some of his interfaces and file operations are consistent, that is, with the same code, can be used as a file operation or Stringio operation. Like what: Copy the Code

Compressing data creating gzip filesLet's look at a slightly troublesome approach Import stringio,gzipcontent = ' life was short. I use python ' zbuf = Stringio.stringio () Zfile = gzip. Gzipfile (mode= ' WB ', Compresslevel=9, fileobj=zbuf)

This article analyzes the Python collection type usage. Share to everyone for your reference. The specific analysis is as follows: Python's collection type is similar to other languages and is an unordered set of distinct elements that I have not

The example in this paper describes how Python obtains the native external network IP. Share to everyone for your reference. Specific as follows: Python Gets the native extranet IP from the Web site that displays the IP address, and this Python

In this article, we will analyze a web crawler. A web crawler is a tool that scans web content and records its useful information. It can open up a bunch of pages, analyze the contents of each page to find all the interesting data, store the data

Singleton mode is a kind of common software design pattern. In its core structure, it contains only a special class called a singleton class. The singleton mode can ensure that there is only one instance of a class in the system, and the instance is

If you read a file directly at the command line with input and raw_input, and want to take the file directly into the command line to handle it, The input method can be processed directly, and if you want to use the Raw_input method, the read-in

Inheritance Inheritance describes how the properties of a base class are "inherited" to derived classes. A subclass can inherit any property of its base class, whether it is a data property or a method.The syntax for creating subclasses looks no

Action: Enter the address with paging, remove the last number, set the start and end pages function: Download all pages corresponding to the page number and save as HTML file, named at the current time Code: #-*-Coding:utf-8-*-#------------------

Creating Threads The format is as followsCopy the Code code as follows: Threading. Thread (Group=none, Target=none, Name=none, args= (), kwargs={}) This constructor must be called with the keyword argument -Group Thread groups -Target Execution

In this paper, a simple spider collection program based on scrapy implementation is described. Share to everyone for your reference. Specific as follows: # Standard Python Library imports# 3rd party importsfrom scrapy.contrib.spiders import

Connotation: Regular matching, regular replacement, page crawl, picture preservation. Practical first Python Code reference #!/usr/bin/env pythonimport Urllibimport re x=0def gethtml (URL): page = urllib.urlopen (URL) html = page.read () return

It takes a lot of time to test my current project. Now that you have more than one GB of free memory, why not let it play? TMPFS can speed up the execution of tests by keeping the file system in large memory. But the advantage is also disadvantage,

This article describes a Python method for batch renaming files in a specified directory. Share to everyone for your reference. Specific as follows: This Python code can be replaced with "scroll_00" for all files named "Scroll_1" in the C:\Temp

Swap variables x = 6y = 5 x, y = y, x print x>>> 5print y>>> 6 If statement in row print "Hello" if True else "world" >>> Hello Connection The last method below is cool when binding two different types of objects. NFC = ["Packers", "49ers"]AFC = [

We have now used lock to mutually exclusive access to public resources, but also discussed that the same thread can use Rlock to re-enter the lock, but even though we only deal with the simple synchronization of some programs, we are not even

Recently repaired corrupted JPG written for the customer, the effect is also possible, but there is no guarantee that any situation will apply. If you have a damaged photo, you might want to try it if you can use it to leave a message for me.Copy

There is no better way to write excel,lorinnn search on the Internet and later use of the method is to use a third-party library xlutils to achieve this function, the main idea is to first copy the sheet and then again on the basis of appending and

Today we'll talk about the GUI applet written in Python. A small alarm clock (just a ScreenTip, no sound) Let us first introduce how this alarm clock is wonderful. Need to be started from the command line. No title bar. No menu. There's not even a

In this paper, we describe the method of Python to print scrapy spider tree structure. Share to everyone for your reference. Specific as follows: Through the following code can be at a glance to know scrapy crawl page structure, call is very