Python

It's written in front. This time the reptile is about the house price information crawl, the goal is to practice more than 100,000 data processing and the whole station type crawl. The most intuitive way to increase the amount of data is to

The default encoding for strings in Python code is the same as the encoding of the code file itselfThe role of Decode is to convert other encoded strings into Unicode encodingThe role of encode is to convert a Unicode encoding into another encoded

If there is no __init__ method function in a class, the instance object created by the class name is empty and the tangent is not initialized; If there is this method function, it is usually the first method function of the class, a bit like a

The content here is based on Linux process basics and Linux text streaming. The main function of the subprocess package is to execute external commands and programs. For example, I need to use wget to download files. I invoke the wget program in

Memory management of language is an important aspect of language design. It is an important factor in determining language performance. Whether the manual management of C language, or Java garbage collection, are the most important features of

1. Project background In the Python instant web crawler Project Launch Note We discuss a number: Programmers waste time on debugging content extraction rules, so we launch this project, freeing programmers from cumbersome debugging rules into

Solving ideas The first thought was to use Python's regular expressions to match illegal characters and then find illegal records. But the ideal is always plump, but the reality is brutal. In the process of implementation, only to find their own

How do I implement an iterative object and an iterator object? Actual case A software requirement to crawl the scent of each city from the network, and then show: Beijing: 15 ~ 20 Tianjin: 17 ~ 22 Changchun: 12 ~ 18 ... If you crawl

In this article, I'll try to show you how to develop Python applications (primarily Web applications) with Docker. While I am personally focused on Python's flask micro-framework, the purpose of this article is to demonstrate how to better develop

Objective cTYPES is a Python external library of functions. It provides a C-compatible data type and allows calls to functions in the dynamic-link library/shared library. It can wrap these libraries up for use in Python. The introduction of the C

Sometimes we need a more real-time view of the network card traffic on the server, here I wrote two small script, one with the shell (first, only one network card can be viewed at a time), another in Python (after writing, can view more than one

The program often needs to replicate an object, as thought should be the case A = [1, 2, 3] B = A # [1, 2, 3] print B It's been replicated, but now it's time to change the value of the first element to 5. B[0] = 5 # [5, 2,

Example 1, get the MySQL version Copy Code code as follows: #-*-Coding:utf-8-*- #安装MYSQL DB for Python Import MySQLdb as MDB con = None Try #连接mysql的方法: Connect (' IP ', ' user ', ' password ', ' dbname ') con =

SNS What I have been no love, this time the egg pain wrote a login net (kaixin001) and to all the friends send messages in the station script. Happy in the log in when doing some processing, do not pass the original password, from the JS analysis

It took two weeks to develop a Django based project task Management Web application using the working gap time. The real-time dynamics of the project plan can be easily viewed by Project members (^_^ again invent the wheel). From the front to the

First, overview: Python's GC module uses a "reference count" (reference counting) to track and recycle garbage . on the basis of reference counting, you can also solve the problem of circular references that a container object might generate

In my spare time, I implemented the RC4 algorithm with Python. Coding UTF-8 Class method #/usr/bin/python #coding =utf-8 Import sys,os,hashlib,time,base64 class Rc4:def __init__ (Self,public_key = None,ckey_ Lenth =: Self.ckey_lenth =

Group calculation:Group By:split–apply–combineSplit: The data is grouped under certain conditionsApply: Independent application function for each groupCombine: Combining result data into a data structurePokemon = pd.read_csv (' pokemon.csv ')

Interactive programming of the first Python programInteractive programming does not require the creation of a script file, it is written in the interactive mode of the Python interpreter.On Linux you only need to enter the Python command at the

Python implements parallel capturing of 0.4 million house price data for the entire site (can be changed to capture the city), python captures Preface This crawler crawls house price information to practice data processing and whole-site crawling