Programmer Think

1. Overview of volume price relationship "Volume" has many forms, such as trading volume (number of shares), transaction amount, turnover rate and so on. "Volume" generally refers to the trading volume of a certain securities in the trading market in a specific period of time. The trading volume reflects the game of lon ...

Being a crawler will always encounter all kinds of anti climbing restrictions. The first defense line of anti climbing often appears when logging in. In order to limit the automatic login of crawlers, all families have tried their best. The so-called way is one foot high and the devil is one foot high. Small class Steps: (1) Calculate sli ...

catalogue First, simulate the browser's environmental preparation. 1. Introduction to selenium 2.Selenium installation 3. Install WebDriver (1) Installing chromedriver (2) Add chromedriver to environment variable 2, Example: use Selenium operation browser to obtain QQ music list data 1. Start the browser 2. Use webdriver to open qq mus ...

Python ヾ (≥ ▽≤ *) o SET set type 1, Concept of set Set is one of the data types of Python, which is the same as the concept of set in mathematics Before explaining Python sets, I think it is necessary to review the main categories of mathematical sets: Union, intersection and difference Collections in Python If necessary, Pyth ...

Interview questions Talk about your understanding of object orientation Facing objects is a programming idea and a way to look at things from the perspective of classes. Encapsulate things with common properties and methods under the same class. ​ Encapsulation: Definition: put data processing and business implementation logic inside an o ...

Last Zero basics python programming thinking (I) | mathematical operation A small tail is left, that is, logical operation, which is supplemented and updated here first: 4: Logical operation a = 10 b = 20 if (a and b): #Boolean and: returns the value of a if a is False, otherwise returns the calculated value of b print("variable a an ...

Implementation of one-dimensional rain algorithm https://leetcode-cn.com/problems/trapping-rain-water/   def trap_rain_water(height): # Idea: whether a grid can receive rainwater and how much rainwater it can receive are determined by the highest "wall" on both sides # Traverse each grid from the second position to the pen ...

Today's summary 1, Process control Sequential structure: the code is executed from top to bottom, and the statement is executed only once a day. (default) print('hello') print('word') Branch structure: choose to execute or not execute part of the code according to the conditions (use if) age = 10 if age >= 18: print('adult') else: ...

BFS What is BFS BFS is called breadth first search, also called breadth first search. Its alias is BFS, which belongs to a blind search method. Dijkstra single source shortest path algorithm and Prim minimum spanning tree algorithm adopt the idea similar to width first search. The purpose is to systematically expand and check all nodes in ...

1. General 1.1 industry background and pain points Lithofacies analysis is a research work based on the microscopic description and classification of rock slices. It is also an important technology in the study of sedimentation and diagenesis. It has a basic guiding position for the engineering practice of oil and gas exploration and developm ...