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1. Definitions and basic terms of drawings ①. Definition of graph Graph G is composed of two sets V and E, marked as G=(V,E), where V is the finite nonempty set of vertices, e is the finite set of vertex pairs in V, and these vertex pairs are symmetrical as edges. V(G) and E(G) usually represent the vertex set and edge set of graph G re ...

catalogue 12.1MySQL configuration file (1) Configuration section (2) Basic configuration (3) Memory and optimized configuration (4) Log configuration 12.2 data backup and restore (1) Data backup (2) Data restore (3) Binary log 12.3 multi instance deployment 12.4 master slave replication 12.1MySQL configuration file (1) Configu ...

tkinter is Python's standard GUI Library ("Tk interface"). Python uses tkinter to quickly create GUI applications. Since tkinter is built into the python installation package, you can import tkinter library as long as Python is installed. Moreover, IDLE is also written with tkinter, which can cope with simple graphical inter ...

The art and Tao of Python Programming: an introduction to Python language Link to the video course "the art and Tao of Python Programming: an introduction to Python language": https://edu.csdn.net/course/detail/27845 Lambda function Lambda function is an in-line function without a name. It is often called an anonymous function. The ...

1, AbstractIn the actual business development process, we often encounter the need to carry out technical docking with the third party Internet Co, such as Alipay payment docking, WeChat payment docking, High German map query docking and other services. If you are an entrepreneurial Internet, most of them may be connected to other companies api ...

Continue First words After the event loop is created, how to run the concurrent task and asynchronous IO task? ​ By asyncio The code of run shows that loop run_ until_ Complete is the method of running a collaborative process. It is defined as follows: # base_events.py class BaseEventLoop(events.AbstractEventLoop): def run_until_complete(s ...

1. Definition of variables A variable is the address of an area of memory Meaning of variables The command cannot manipulate the value that changes all the time. Using a fixed string of characters to represent an unfixed target can solve this problem 2. Variable definition method in shell script Environment level: the variable becomes invalid a ...

1, Foreword When using uni App to develop cross platform App projects, the functional requirements for uploading pictures, documents and other resources are very common: click the picture frame button to select picture upload, click each picture to preview, and click the delete icon of each picture to delete the corresponding picture. Th ...

  catalogue Realize function Realization effect Introduction to STL General idea How to make the model move? Class diagram design Core code reference material Realize function 1. Adjust the posture of the manipulator through the joint angle (joint motion) 2. Teaching point 3. Coordinate system display 4. Support 3d display of man ...

Collections class operation collection Collections class is a tool class for manipulating collections such as Set,List and Map provided by Java. Collections provides many static methods for manipulating collections, with which collection elements can be implemented Sort, find, replace, and copy. The following describes the methods commonly use ...