Programmer Group

         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 ...

Principle of import module 1. Introduction principle When the code is executed to the import module, the system will automatically enter the specified module and execute all the codes in the module; If the same module is imported multiple times in the same program, the corresponding code will be executed only once. # import test # import tes ...

Volume adjustment is divided into three parts: master volume (hardware volume, control sound card), stream volume (stream volume) and track volume(app volume). app volume formula: app_mix = master_volume * stream_volume * track_volume; Where master_volume，stream_volume and track_volume is a percentage, and 1 indicates that the volume is adju ...

1, Database introduction 1.1 introduction to database Database is a data set that is stored together in a certain way, can be shared with multiple users, has as little redundancy as possible, and is independent of the application. It can be regarded as an electronic filing cabinet - the place where electronic files are stored. Users can add, ...

preface Series of articles: Display process from Android Activity creation to View Android four components communication core When we click the desktop icon to start the App, and the App is displayed, what has happened? Understanding this part will deepen our impression of the relationship and difference among Activity, Window and View, ...

1. Download Android Studio Official website: http://www.android-studio.org 2. Right click to run the downloaded installer as an administrator, select the installation path, and go all the way to Next. 3. Error message when opening for the first time: unable to access Android SDK add on list Reason: after the Android SDK is started, it will det ...

1. Common properties of view class: android:id sets the identifier of the control android:layout_width sets the layout width of the subcomponent android:layout_height sets the layout height of the subcomponent android:background sets the background color of the control android:onClick sets the click event binding listener for the control androi ...

When developing Python applications, the system has only one version of Python 3 installed: 3.x. All third-party packages will be installed by pip in the site packages directory of Python 3. If we want to develop multiple applications at the same time, these applications will share the same python, w ...

by Aurora Today, I'd like to introduce the model part of Django framework. The model is a simple and clear description of real data. It contains the necessary fields and behaviors for stored data. Django follows the DRY Principle. Its goal is that you only need to define the data model, and then you don't need to care about other miscellaneous ...

I've been working on sqlite and python recently After referring to the tutorials on the Internet Combined with the previous java jdbc database tool classes, write the following python connection sqlite tool classes The main reason for this is to keep a java like Object args dynamic parameter writing method is compati ...