python assignment operation, shallow copy, deep copy and detailed analysis of function transfer parameters

Students who have studied C language can distinguish between variables and pointers, while python variables are all in the form of pointers, so when assigning variables (such as a=b), they only copy the index. If you want to copy the contents of the pointer index, you need to use light copy and deep copy. Let's introduce the assignment operatio ...

Posted by carnold on Tue, 24 May 2022 19:54:06 +0300

#LeetCode brush questions#, #The sum of two numbers#, #Hash table#

The first question of LeetCode brushing questions, the use of the sum of two numbers and the hash table Topic description Given an integer array nums and a target value target, please find the two integers in the array whose sum is the target value, and return their array indices. You can assume that there will only be one answer for each input ...

Posted by 8ta8ta on Tue, 24 May 2022 17:54:50 +0300

Python - data analysis - pandas data preprocessing Standardized data

Python - data analysis - pandas data preprocessing Standardized data Different features often have different dimensions, and the resulting numerical differences may be very large. If they are not processed when it comes to spatial distance calculation or gradient descent method, the accuracy of data analysis results will be affected. In order ...

Posted by jchemie on Tue, 24 May 2022 16:55:00 +0300

Python speech synthesis guide

Article source: Fanfan's Python Learning Road Author: a grain of rice Overview of Speech Synthesis In general, speech synthesis is the technique of producing artificial speech by mechanical, electronic means. Among them, TTS, is the abbreviation of Text-To-Speech, that is, "from text to speech", which is part of the human-machine d ...

Posted by cbrknight on Tue, 24 May 2022 15:36:06 +0300

python foundation-11-process control (if else, while)

Process control if else   if writing a program is compared to walking, so far, we have always taken a straight road and haven't encountered a fork. Imagine that in reality, you encounter a fork, and then you decide where to turn. There must be a motive. You have to judge which fork is the way you really want to go. What if we want the prog ...

Posted by AndyMoore on Tue, 24 May 2022 15:26:01 +0300

Python learning notes class encapsulation & class inheritance & polymorphic inheritance & class methods and static methods & singleton design pattern

1, Class encapsulation: 1. Concept: Generalized encapsulation: the definition of functions and classes is the embodiment of encapsulation Encapsulation in a narrow sense: some attributes of a class do not want to be directly accessed by the outside world in the process of use. Instead, this attribute is private [only held by the current class], ...

Posted by loveccb on Tue, 24 May 2022 14:40:03 +0300

Core technology and algorithm of python natural language processing -- Chinese syntactic analysis based on PCFG

This chapter in this book is a little thin, but the author also explained that this book is an introductory practice book of NLP, and syntactic analysis belongs to a higher-level problem in NLP, so I didn't explain it in depth. I'm also an introductory NLP after learning this book. After learning this book, I will learn statistical natural lang ...

Posted by forcerecon on Tue, 24 May 2022 12:42:37 +0300

Build an online image processing server using flash

Task description The robot needs to take pictures and obtain detection results during operation. The computer processing on the robot is too slow, so it wants to put the image processing program on the server. When the robot needs detection, it sends the captured images and processing requirements to the server. After processing, the server sen ...

Posted by ChrisF79 on Tue, 24 May 2022 09:32:26 +0300

Opencv visual eye Python image processing Xi: Top Hat operation and black hat operation of Opencv image morphological processing

This column mainly introduces that if image processing is carried out through OpenCv python, the function processing prototype of OpenCv Python is understood through the principle. In specific cases, different levels and methods of processing are carried out for different images, so as to achieve a series of operations such as image denoising a ...

Posted by djumaka on Tue, 24 May 2022 06:27:11 +0300

What are your common encryption algorithms?

Encryption algorithms can be divided into reversible encryption and irreversible encryption, and reversible encryption can be divided into symmetric encryption and asymmetric encryption. 1, Irreversible encryption Common irreversible encryption algorithms include MD5, HMAC, SHA1, SHA-224, SHA-256, SHA-384, and SHA-512. Among them, SHA-224, SHA- ...

Posted by Fearless_Fish on Tue, 24 May 2022 01:49:38 +0300