• Pit and summary in the development of Android widget


    @ catalogue summary Official reference design sketch AndroidManifest.xml Receiver Service Options res/xml/ widget_desktop_options.xml Common parameters Size updatePeriodMillis initialLayout Using App Widgets with Collections Official reference AppWidgetProvider RemoteViewsService RemoteViewsFactory DesktopActivity summary Official reference Build an App Widget design sketch Put a rendering. This is the desktop app folder I play AndroidManifest.xml Receiver Remember not to make […]

  • Crosstab function of pandas


    By bex tCompile VKSource: towards Data Science introduce I like the course “intermediate data visualization with Seaborn” on datacamp very much. It teaches novices great charts and methods. But when it comes to heat map, the teacher of the course somehow introduced a new pandas function crosstab. Then, quickly say, “crosstab is a useful function […]

  • The elementui table component merges rows or columns


    introduce 1. Official documents The official document of the method of merging rows or columns is: parameter explain type Optional value Default value span-method Calculation method of merged rows or columns Function({ row, column, rowIndex, columnIndex }) —— —— You can merge rows or columns by passing the span method method to table. The parameter […]

  • Five powerful techniques for visualizing data using Matplotlib


    By rizky Maulana nurhidayatCompile VKSource: towards Data Science Data visualization is used to display data in a more direct way and is easier to understand. It can be formed in the form of histogram, scatter chart, line chart, pie chart, etc. Many people still use Matplotlib as a back-end module to visualize their graphics. In […]

  • Es + HBase learning


    Step one: find out what the framework (Technology) is for, what problems and pain points have been solved, and what other “competing products” of the same kind still have Step 2: how to use it Step 3: understand the principle Elasticsearch WHAT ElasticsearchIt’s based onLuceneOfSearch server。 It provides a distributed multi-user full-text search engine based […]

  • This simple and practical Vue table component, too powerful and practical!


    Hello everyone, I’m a heartbroken editor for the majority of programmers. I recommend a small tool / source code every day, fill your favorites, and share a little skill every day, so that you can easily save development efficiency, and achieve the goal of not working overtime, not staying up late and not losing your […]

  • Web front end — common tags (list tags, table tags) in body


    1、 List label Semantics: marking a pile of data as a whole / list There are three kinds of list tags in HTML 1. Unordered list: unordered list #1. Function: Make navigation bar, commodity list, news list, etc #2. Combination use UL > Li seckill coupon Plus members Flash buying auction Jingdong clothing Jingdong supermarket […]

  • [sharing in open class] several optimizations to make the performance of table data processing soar instantly


    Trainer Introduction Wang Hong, lecturer of main forum of 2020 China. Net developer summit, technical director of grapevine table, senior architect of gcexcel project team. Since 2014, Mr. Wang Hong has been focusing on the research of enterprise high-performance form technology, designed a new form component architecture for grapevine, and led the R & D […]

  • Optimizing garbage collection strategy with genetic algorithm


    By Andrew KuoCompile VKSource: towards Data Science Genetic algorithm is an optimization technology, which is similar to evolutionary process in essence. This may be a rough analogy, but if you squint at it, Darwin’s natural selection is really roughly similar to an optimization task, which aims to create organisms that are perfectly suited to reproduce […]

  • Folding cells in IOS


    In this paper, we share the specific code of folding cells in IOS for your reference. The specific content is as follows thinking Click the button or cell to expand and contract, and use a bool value to record the expansion and contraction status of the cell. According to the bool value, the height of […]

  • xlswriter+yield+websocket


    xlswriter+yield+websocket This is a high-performance Excel / CSV Library Based on xlwriter + yield, which integrates websocket to push the progress of Excel operation.This class inherits from the extension of xlswriter and encapsulates some common methods while maintaining the usage of base class.Xlswriter document https://xlswriter-docs.viest.me/Source code: https://github.com/yzh0325/xl…Why use xlwriter to operate excel? Due to memory […]