Programmer Group

Python must be familiar to everyone, and you may be tired of even arguments about its usefulness or usefulness. However, as a popular language, it still has its uniqueness. Today we will talk about Python again. At the end of the article, there is a technical exchange group. Welcome to participate. Welcome to collect and like. Python is a dyna ...

As a Gopher, we can easily form a programming convention: whenever there is an object x that implements the io.Closer interface, after getting the object and checking the error, we will immediately use defer X. close() to ensure that the X object is closed when the function returns. Here are two examples of idiomatic writing.HTTP requestresp, e ...

         When we program PYQT5, when the interface design is completed, we usually need to correspond the control to the corresponding function events in the code one by one. If there are few controls, it may be nothing. However, with the gradual increase of requirements and functions of subsequent softwa ...

1, if statement Syntax:         if condition:                 indented statement(s) If the condition is true, execute these indented statements, otherwise skip these statements example: answer = input("Do you want to see a spiral? y/n:") if answer == 'y': print("Working...") import turtle t = turtle.Pen() t.width(2) f ...

background Emotional analysis is used in my sister's graduation thesis. He has used crawler software to crawl various microblog accounts, and the text and comments on a topic are stored in excel. Intends to use Baidu intelligent cloud, Natural Language Processing - > sentiment analysis. realization Get access_token API official docum ...

1, What is an exception An exception is a signal of a program error. Once an error occurs in the program, an exception will be generated. If it is not handled in the program, an exception will be thrown, and the operation of the program will be terminated. In Python, the exceptions triggered by errors are as follows: There are two kinds of err ...

One: Target Site Information Desktop on the other side     The web address is: Desktop Wallpaper PC Desktop Wallpaper HD Wallpaper Download Desktop Background Picture On the Other Desktop 2: Target Site Analysis (1): Construct a list of URL s for a page What we need to do is crawl pictures of a given number of pages on the ...

1, Bayes theorem 1. Introduction           Bayesian theory is named after Thomas Bayes, A theologian in the 18th century. Generally, the probability of event A under the condition of event B (occurrence) is different from that of event B under the condition of event A (occurrence); However, there i ...

ROS_ Core analysis of Python programming case code Through the intermediate tutorial supporting the Handsfree mini robot platform, I learned about ROS_ The knowledge of realizing sensor data reading, motion control and autonomous navigation by python programming is summarized as follows: 1. Sensor data reading 1.1 obtain and print the ba ...

2021SC@SDUSC preface This analysis measures.py file is used to calculate evaluation indicators, including mAP, confusion matrix and IOU related functions. fitness function def fitness(x): # Model fitness as a weighted combination of metrics w = [0.0, 0.0, 0.1, 0.9] # weights for [P, R, mAP@0.5, mAP@0.5:0.95] return (x[:, :4] * ...