Summary of definitions and usage of deep and shallow functions

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

1. Introduction Tutorial on Deep and Shallow Copy: 10 Recommended Zero-Based Introductory Tutorials on Deep and Shallow Copy

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(...

2. php project practical tutorial: use php to develop a simple news release and management system tutorial collection

#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

##Introduction: From a hierarchical perspective, object copying can be simply divided into Shallow copy and deep copy. As the name suggests, shallow copy only copies the properties of one layer of objects and does not copy the properties of objects within the object. Deep copy of an object copies the properties of objects nested in layers. This article is about me. Some summary of experience in copying objects, from shallow copy to deep copy, interested friends can learn together

4.

Development of Micro News System

Introduction: 1. System description "You can only know the depth after experience". The purpose of developing this system is mainly to learn and straighten out the system. The development process further combines theory with practical application, which is also an important milestone in the entry-level learning of PHP. Development environment: Apache2.0+php5.4+mysql5.5 Development tools: text editor (dreamweaver/editplus). 2. Key points of system development 1. Application of smarty 2. Backend membership and permission verification 3. Encapsulation of objects and classes 3. System module classification 1. MyS...

##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.

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