Programmer Group

Computer vision expert Adrian roserock recently shared how to write a scanning program that can recognize QR code and bar code in real time with the help of OpenCV and Zbar. Finally, he deployed it on raspberry pie and successfully made a practical bar code & QR code scanning device. Recently, a friend asked me if there are any modul ...

Principle of import module 1. Introduction principle When the code is executed to the import module, the system will automatically enter the specified module and execute all the codes in the module; If the same module is imported multiple times in the same program, the corresponding code will be executed only once. # import test # import tes ...

1, Introduction to CART decision tree algorithm CART (Classification And Regression Trees) algorithm is a tree construction algorithm, which can be used for both classification tasks and regression. Compared with ID3 and C4.5, which can only be used for discrete data and classification tasks, CART algorithm has a much wider application. It can ...

Function: in short, it is a code block that encapsulates functions. Functions: 1. Structured programming is the most basic encapsulation of code, which generally organizes a piece of code according to function 2. The purpose of encapsulation is to reuse and reduce redundant code 3. The code is more concise, beautiful and readable Function def ...

1. Python code and C code character association This section describes how Python characters are associated with C characters (such as module name, class name, variable name, function name, etc.) during module expansion? Take the ADC class name symbol as an example to illustrate the following association process: C code character ADC STATI ...

preface Over the past few years, I have been struggling in the it industry. Along the way, many have summarized some high-frequency interviews in the python industry. I see most of the new blood in the industry, and I still have all kinds of difficult questions for the answers to all kinds of interview questions or collection Therefore, I dev ...

pandas notes 004 4, Basic operations of Index object Index and Index import pandas as pd import numpy as np 1. Index object index 1.1 Series and DataFrame Indexes in Series and DataFrame are Index objects. Series: pd1 = pd.Series(range(5),index = ['A','B','C','D','E']) #Create a Series index from the list and specify the index name ...

1, Probability list + sample list         Task description: we often have a probability list and a sample list to represent the probability that each sample is selected, and in the probability list, the sum of the probabilities is 1. For example, [0.7, 0.2, 0.1] and ['iron man', 'Captain America', 'Thor'], the elements in ...

1, Decision tree Decision Tree (Decision Tree) is a decision analysis method that calculates the probability that the expected value of net present value is greater than or equal to zero by forming a Decision Tree on the basis of knowing the occurrence probability of various situations, evaluates the project risk and judges its feasibility ...

catalogue 1, State retention 1. HTTP protocol 2. cookie status hold Set cookie return   Save Cookies Not saved   Saved 3. session state hold You need to set the secret key before storing the session 4. Exception handling Custom 500 Custom 404 5. Hook function Before being accessed for the first time, the hook function H ...