The Python crawler understands these two requests, indicating that you understand half of the crawler

get and post requests in Python Crawlers preface Python crawlers can request data in two ways: get and post. Maybe readers have mastered their applications to a high level, but do you know their basic syntax? Article catalog get and post requests in Python Crawlers 1. Understand the urlib module ...

Posted on Sat, 13 Jun 2020 23:03:08 -0400 by farkewie

Shell syntax specification

ver: 1.0 Blog: https://www.cnblogs.com/Rohn This paper introduces some syntax specifications of Shell programming. The main reference is Google's Shell syntax style. catalog background Which Shell to use When to use Shell notes Top level notes Function notes TODO comments format indent Line length and long string The Conduit l ...

Posted on Sat, 13 Jun 2020 21:45:00 -0400 by pjc2003

Read csv and Excel data with pandas

This article uses real stock data as an example to teach you how to read common data files in Python. Content: Read csv data Read Excel data Merge multiple tables Data file download address: CSV data file nasdaq-listings.csv https://raw.githubusercontent.com/fishstar/Data-Analysis-Practice/master/import%26manage_data_in_Python/nasdaq-listings ...

Posted on Sat, 13 Jun 2020 06:55:15 -0400 by markepic

Python multithreaded crawler real combat case: crawling and collection of information materials of major anchors

  preface The text and pictures of this article are from the Internet, only for learning and communication, not for any commercial purpose. The copyright belongs to the original author. If you have any questions, please contact us in time for handling. The top list, a website that gathers information and information of the anchor, has a comp ...

Posted on Sat, 13 Jun 2020 05:16:56 -0400 by pushpendra.php

kalibr installation and compilation under Ubuntu 18.04 + ROS melody

kalibr installation and compilation under Ubuntu 18.04 + ROS melody Attention & emphasis: any course must be browsed first, and there is a general idea in mind. Follow the process step by step, and you can have an early warning before falling into the pit Recommended tutorials: Joint calibration o ...

Posted on Sat, 13 Jun 2020 00:35:06 -0400 by WhiteCube

Training cat and dog datasets (and training after image enhancement)

catalog 1, Required environment (installation with link) Two. Data set preparation 3, Network model 4, Data preprocessing 5, Training 6, Fill with data 1, Required environment (installation with link) tensorflow and keras, the specific version installation depends on personal needs. The installa ...

Posted on Fri, 12 Jun 2020 04:11:31 -0400 by TexasMd91

Python data structure and algorithm -- binary search tree

What is binary search tree Binary Search Tree (also: Binary Search Tree, binary sort tree) it is either an empty tree or a binary tree with the following properties: if its left subtree is not empty, the values of all nodes on the left subtree are less than the values of its root nodes; if its right subtree is not empty, the values of all nodes ...

Posted on Fri, 12 Jun 2020 02:29:35 -0400 by WebbieDave

Machine learning - overview, feature extraction of data (notes)

1. The relationship among artificial intelligence, machine learning and deep learning What machine learning can do. Recommended books for learningLearning objectives 2. What is machine learning Machine learning is to automatically analyze and obtain laws (models) from data, and use laws to predict u ...

Posted on Fri, 12 Jun 2020 00:23:35 -0400 by Goose

Python zero basic programming - 09 practical cryptology chapter - encryption and decryption of classical encryption algorithm

abstract Book to previous: 1-Zero basic programming -- Python basic 2-Zero basic programming: basic theory of cryptography In the previous part, we shared the basic theory of cryptography. Starting from Morse code, we analyzed Caesar encryption, transposition encryption, digital multiplication en ...

Posted on Thu, 11 Jun 2020 22:57:56 -0400 by Zaxnyd

100 learning notes of Python

Title Source: Python 100 cases Example 2 Skill: segment function uses number axis to divide and locate. Profit: ratio = [0.01, 0.015, 0.03, 0.05, 0.075, 0.1] Title: The bonus paid by the enterprise is based on the profit commission. If the profit (I) is less than or equal to RMB 100000, the bonus ...

Posted on Thu, 11 Jun 2020 01:04:17 -0400 by Thatsmej