Programmer Group

preface This blog mainly introduces Python's magic functions. In depth learning or python programming, python class writing will be more or less involved, including Python magic functions. For example, when writing a data loading generator, it may be involved__ next__，__ iter__ Function. Of course, the generator may be done with the keywo ...

Knowledge summary of open source web framework django (10) Asynchronous scheme Celery Producer consumer design model reflection: What's wrong with the following two lines of code? CCP().send_template_sms(mobile, [sms_code, 5], 1) return JsonResponse({'code': 0,'errmsg': 'ok'}) Question: Our code is executed synchronously from to ...

Django model layer Today, let's talk about Django's model layer. Django provides an abstract model ("models") layer to build and manipulate the data of Web applications. 1. The concept of model: 1. Model introduction The model can accurately and uniquely describe the data. Contains important fields and behaviors for stored da ...

prefaceOne day, when we were in the editing background, we said that every time we upload ppt, pdf and word, we should export the pictures of each file first, and then upload them one by one (png is used as preview, ppt, pdf and word source files cannot be downloaded directly). We said that the efficiency is too low. We asked if there is any wa ...

When I first wrote a blog, there were too many solutions to similar problems on CSDN, but they couldn't solve my problem. This time, it was not easy to solve my problem. I hope to record this solution and help students with similar problems. Maybe it's written incorrectly, maybe it's written so that people don't understand it. In fact, the p ...

1. Process Software download and installationdata acquisitionCustom datasetModel buildingmodel trainingtestsummaryfollow-up Download address of this project GitHub 1. Software download and installation 1.Download address: https://github.com/udacity/self-driving-car-sim 2. After entering the link, you can choose your own platform to download ...

How important are process threads? At the beginning of learning Python, you may not feel it, because the code you write can be executed from top to bottom, but in fact, it is very elementary. In order to make full use of the computer configuration to speed up the program progress, we often use multi process and multi thread when actually develo ...

1. Recursion The programming technique of a program calling itself is called recursion. As an algorithm, recursion is widely used in programming languages. A procedure or function has direct or indirect meaning in its definition or description A method of indirectly calling itself, which usually transforms a large and complex problem la ...

Video Explanation: 1, DBC code template # 1. Import Dash import dash import dash_bootstrap_components as dbc # 2. Create a dash instance object app = dash.Dash(external_stylesheets=[dbc.themes.BOOTSTRAP]) # 3. Add DBC component badge = dbc.Button( ["notice",dbc.Badge("4", color="light", text_color="primary", className="ms-1"),], ...

Example 001: digital combination Title: there are four numbers: 1, 2, 3 and 4. How many three digits that are different from each other and have no duplicate numbers? How much is each? The program analysis traverses all possibilities. Please shave off the duplicates. num = 0 for a in range(1, 5): for b in range(1, 5): for c in ra ...