


The collection module is an extension of Python's general built-in containers: dictionaries, lists, tuples and sets. It contains some professional container data types: Counter (counter): dict subclass, used to calculate hashability objects number. OrderedDict (ordered dictionary): dict subclass, recording the order in which data members are added. defaultdict (default dictionary): A dict subclass that calls a factory function to provide a default value for missing dict values. namedtuple (named tuple): The factory function generates a tuple subclass with named fields. deque (two-way queue): A function that can quickly dequeue and join the queue at both ends of the "queue", similar to a queue (list-like) container. ChainMap: A dictionary-like type that creates a single view for multiple maps. UserDict: Wrapping a dictionary makes it easier to create subclasses of dictionaries. UserList: Wrapping list objects makes it easier to create subclasses of lists. UserString: Wrapping string objects makes it easier to create subclasses of strings
Introduction: The collection module is an extension to Python’s general built-in containers: dictionaries, lists, tuples and sets. It contains Some professional container data types: Counter: dict subclass, used to count the number of hashable objects. OrderedDict (ordered dictionary): dict subclass, recording the order in which data members are added. defaultdict (default dictionary): A dict subclass that calls a factory function to provide a default value for missing dict values. namedtuple(...
#Introduction: "Only through experience can you know the depth". After learning PHP, you must practice the project. This article will introduce the PHP news system course of PHP Chinese website. To summarize, you can use PHP to develop a simple news release and management system to test your learning situation. Through actual project practice, you can streamline the system development process and further combine theory with practical application. This is also the introduction to PHP learning. An important milestone in the new stage. Below are 5 courses recommended by php Chinese website for developing simple news systems. You can choose to learn according to your own situation!
##3. JavaScript Detailed explanation of deep and shallow copying examples of objects
4.
Development of Micro News System
##5.
Three methods of deep and shallow copying of python3 lists##Introduction: This article is mainly for everyone’s in-depth It analyzes three methods of deep and shallow copying of python3 lists, which has certain reference value. Interested friends can refer to it
6. In-depth understanding of Python collection module and deep and shallow copy
Introduction : This article introduces an in-depth understanding of the Python collection module and deep and shallow copy
7. Request: How to get the front-end effect of this map heat, please code
Introduction: How to get the front-end effect of this kind of map popularity? The code is to display the statistical data of each region using the depth of the color. If you ask for front-end code, the back-end is not needed. There should be ready-made third-party front-end components that can implement it, right? ------Solution--------------------Webmaster statistics, use jvectormap Home page: http://jvectormap.com/
8. Photoshop A bright red strawberry
Introduction: Strawberry looks very simple, but the texture on the surface is very complex, consisting of many small holes, and the holes should be sensitive to different light and have different shades. Therefore, you must be careful when making it.
9. Photoshop design and production of very exquisite golden pleated ribbon
##Introduction: The focus of the ribbon is on the depiction of the folds. Different parts of the ribbon receive different light, and the color and depth of the folds are slightly different. When making, the ribbons with different curvatures need to be segmented first, and then rendered segment by segment.
[Related Q&A recommendations]:
javascript - reference object assignment depth copy jquery.extend
objective-c - iOS dark and shallow copy?
How to use swift code to modify the color depth of the comment text in the text field in ios
The above is the detailed content of Summary of definitions and usage of deep and shallow functions. For more information, please follow other related articles on the PHP Chinese website!

This tutorial demonstrates how to use Python to process the statistical concept of Zipf's law and demonstrates the efficiency of Python's reading and sorting large text files when processing the law. You may be wondering what the term Zipf distribution means. To understand this term, we first need to define Zipf's law. Don't worry, I'll try to simplify the instructions. Zipf's Law Zipf's law simply means: in a large natural language corpus, the most frequently occurring words appear about twice as frequently as the second frequent words, three times as the third frequent words, four times as the fourth frequent words, and so on. Let's look at an example. If you look at the Brown corpus in American English, you will notice that the most frequent word is "th

This article explains how to use Beautiful Soup, a Python library, to parse HTML. It details common methods like find(), find_all(), select(), and get_text() for data extraction, handling of diverse HTML structures and errors, and alternatives (Sel

Dealing with noisy images is a common problem, especially with mobile phone or low-resolution camera photos. This tutorial explores image filtering techniques in Python using OpenCV to tackle this issue. Image Filtering: A Powerful Tool Image filter

This article compares TensorFlow and PyTorch for deep learning. It details the steps involved: data preparation, model building, training, evaluation, and deployment. Key differences between the frameworks, particularly regarding computational grap

Python, a favorite for data science and processing, offers a rich ecosystem for high-performance computing. However, parallel programming in Python presents unique challenges. This tutorial explores these challenges, focusing on the Global Interprete

This tutorial demonstrates creating a custom pipeline data structure in Python 3, leveraging classes and operator overloading for enhanced functionality. The pipeline's flexibility lies in its ability to apply a series of functions to a data set, ge

Serialization and deserialization of Python objects are key aspects of any non-trivial program. If you save something to a Python file, you do object serialization and deserialization if you read the configuration file, or if you respond to an HTTP request. In a sense, serialization and deserialization are the most boring things in the world. Who cares about all these formats and protocols? You want to persist or stream some Python objects and retrieve them in full at a later time. This is a great way to see the world on a conceptual level. However, on a practical level, the serialization scheme, format or protocol you choose may determine the speed, security, freedom of maintenance status, and other aspects of the program

Python's statistics module provides powerful data statistical analysis capabilities to help us quickly understand the overall characteristics of data, such as biostatistics and business analysis. Instead of looking at data points one by one, just look at statistics such as mean or variance to discover trends and features in the original data that may be ignored, and compare large datasets more easily and effectively. This tutorial will explain how to calculate the mean and measure the degree of dispersion of the dataset. Unless otherwise stated, all functions in this module support the calculation of the mean() function instead of simply summing the average. Floating point numbers can also be used. import random import statistics from fracti


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SublimeText3 English version
Recommended: Win version, supports code prompts!

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)
