Python crawler ajax crawls the content of Ma Yun's father's Micro blog

ajax crawling Sometimes when we use Requests to grab the page, the result may be different from what we see in the browser. We can see the normal page data in the browser, but we don't get the result using Requests. The reason is that Requests gets the original HTML document, while the page in the browser is the page passing by again The result ...

Posted on Sat, 22 Feb 2020 12:37:06 -0500 by fifin04

python logging duplicate log problem

Original link: https://blog.csdn.net/huilan_same/article/details/51858817 When writing logs with the logging module, I encountered the problem of duplicate printing of logs.That is, the first call in the same script, normally shown, the second call, shows two duplicates, and so on, is very headache. Reason found online: handle object was not de ...

Posted on Sat, 22 Feb 2020 12:08:55 -0500 by []InTeR[]

Quantsrat lets R language perform strategic backtracking and quantitative trading like Python

Using the Quantsrat package Quantsrat s are used to build strategies, add metrics, generate signals, generate buying and selling rules, and so on.The results are similar to Python quantification platforms like premium mines, ten thousand mines, and baskets.Because CRAN cannot be installed online, there are still some pits in the installation pr ...

Posted on Sat, 22 Feb 2020 11:28:59 -0500 by chaiwei

Python 3 standard library: struct binary data structure

1. struct binary data structure The struct module includes functions that transform byte strings to native Python data types, such as numbers and strings. 1.1 function and Struct class Struct provides a set of module level functions that handle structure values, as well as a struct class. The format indicator converts from a string format to a ...

Posted on Sat, 22 Feb 2020 06:27:01 -0500 by Dirtbagz89

Implementation of four maze generation algorithms in Python Reprint: graphic display implementation

Respect for originality: python maze generation algorithm: graphic display implementation Introduction to maze graphic display Code introduction GameSearch.py Complete code Introduction to maze graphic display pygame is used to make A graphic display of four maze algorithms, as shown in the fig ...

Posted on Sat, 22 Feb 2020 05:56:32 -0500 by manwhoeatsrats

Metaclasses and properties (Ⅱ)

This article is based on "Effective Python - 59 effective ways to write high-quality Python code" [U.S.] Brett Slatkin translated the contents of this book, wrote his own insights in some aspects, and excerpted some as reading notes for future encouragement. Invasion and deletion. Article 31 ...

Posted on Sat, 22 Feb 2020 04:50:46 -0500 by tallberg

Getting started with Flask

Catalog 1, Architecture introduction 1. What is Flask? 2, Flask form operation 3, What is flask Sqlalchemy? 1. How to configure the database? 2. Define model 3. Model column type 4. Model column properties 5. Data query 6. Paging implementation 7. Flask migrate database migration 1. Model ...

Posted on Sat, 22 Feb 2020 02:50:54 -0500 by Nulletz

Notes for beginners of Python

Face to face programming: write classes that represent things and scenes in the world, and create objects based on these classes. The created objects are called instantiations. Create class class Dog(): #The first letter in the class name in Python should be capitalized def __init__(self, name, age): #The functions in the class are ...

Posted on Sat, 22 Feb 2020 02:24:29 -0500 by fansphp

Python 3 standard library: heapq heap sorting algorithm

1. heapq heap sorting algorithm Heap is a tree data structure, in which the child node and the parent node have an orderly relationship. Binary heap can be represented by an organized list or array, where the child elements of element N are located at 2*N+1 and 2 * N + 2 (the index starts from 0). This layout allows the heap to be reorganized i ...

Posted on Sat, 22 Feb 2020 01:50:56 -0500 by discorevilo

Using Python to realize a simple breakthrough strategy of commodity futures brin index

The breakthrough strategy of brin index is very simple. It is also very easy to write this strategy in Python language. With the back test configuration information, there are 70 lines of code, which can be more simplified in practice. In view of the teaching strategy, no difficult Python syntax is used, and basic statements and structures are ...

Posted on Sat, 22 Feb 2020 01:04:26 -0500 by EricC