投稿時間:2021-08-12 23:21:46 RSSフィード2021-08-12 23:00 分まとめ(28件)

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Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	Macでpython３インストールができません	https://teratail.com/questions/354021?rss=all	MacでpythonインストールができませんXcodeをインストール後、homebrewをインストール。	2021-08-12 22:32:20
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	tkinterでリストボックスに値を入力した後に、リストボックスの項目をクリックすることで、テキストウィジェットを表示させたいです。	https://teratail.com/questions/354020?rss=all	tkinterでリストボックスに値を入力した後に、リストボックスの項目をクリックすることで、テキストウィジェットを表示させたいです。	2021-08-12 22:22:14
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	eclipseを使用してcsvファイルの読み込みを行いたいのですが文字化けしてしまいます。	https://teratail.com/questions/354019?rss=all	eclipseを使用してcsvファイルの読み込みを行いたいのですが文字化けしてしまいます。	2021-08-12 22:19:18
Ruby	Rubyタグが付けられた新着投稿 - Qiita	【Rails】多数のテーブルが存在する場合においてアソシエーションの一覧を取得する	https://qiita.com/shogo452/items/b06703bb1141016ab580	【Rails】多数のテーブルが存在する場合においてアソシエーションの一覧を取得する概要本記事は数百個のテーブルが存在するアプリケーションの開発をしている中で、あるモデルがどのモデルに対してアソシエーションの関係があるかを一覧で把握したいことがあった際に、アソシエーションの情報を一覧で取得できるコマンドを考えた際のメモになります。	2021-08-12 22:37:16
Ruby	Rubyタグが付けられた新着投稿 - Qiita	Heroku 「 ▸ Couldn't find that app.」というエラーが出てきた時の解決方法	https://qiita.com/uot/items/24cb9efe8d18fbfa7d5f	はと気づいた先ほどherokucreateで一度違う、アプリを作成してしまっていた。	2021-08-12 22:12:14
AWS	AWSタグが付けられた新着投稿 - Qiita	AWSデベロッパーアソシエイト（DVA）単語まとめ	https://qiita.com/ryo1112/items/9e1a4e08cba0119d6108	※手動再デプロイ新規および既存のインスタンスImmutable最小限新しいインスタンスの終了新規のインスタンスTrafficsplitting新しいバージョンにルーティングされて一時的に影響を受けたクライアントトラフィックの割合※※トラフィックの再ルーティングと新しいインスタンスの終了新規のインスタンスBlueGreen最小限×URLのスワップ新規のインスタンス※バッチサイズによって異なる※※evaluationtime評価時間オプションの設定によって異なるAmazonElasticacheMemcachedとRedisAmazonElasticacheMemcashedの特徴マルチスレッドAmazonElasticacheRedisの特徴レプリケーション高可用性、PubSubAmazonDynamoDBRCUReadCapacityUnit、WCUWriteCapacityUnit計算問題でよく出るやつ結果整合性のRCUKBを秒間に回読み込む強力な整合性のRCUKBを秒間に回読み込むWCUKBを秒間に回書き込むDynamoDBストリームDynamoDBテーブル内の項目レベルの変更情報を格納するAWSLambda関数を呼び出すためのトリガーにできるAWSLambdaメモリサイズMBMBの間で設定する。	2021-08-12 22:12:53
Docker	dockerタグが付けられた新着投稿 - Qiita	【2021年8月版】Raspberry Pi 3 Model B+ & Mirakurun & EPGStationで地デジ録画サーバー構築	https://qiita.com/sunset0916/items/e97b90b23872ca3ca0cd	録画が成功するとSambaで共有しているディレクトリに録画したファイルが保存されているはずなので再生して録画できているか確認します。	2021-08-12 22:29:03
Ruby	Railsタグが付けられた新着投稿 - Qiita	【Rails】多数のテーブルが存在する場合においてアソシエーションの一覧を取得する	https://qiita.com/shogo452/items/b06703bb1141016ab580	【Rails】多数のテーブルが存在する場合においてアソシエーションの一覧を取得する概要本記事は数百個のテーブルが存在するアプリケーションの開発をしている中で、あるモデルがどのモデルに対してアソシエーションの関係があるかを一覧で把握したいことがあった際に、アソシエーションの情報を一覧で取得できるコマンドを考えた際のメモになります。	2021-08-12 22:37:16
Ruby	Railsタグが付けられた新着投稿 - Qiita	Heroku 「 ▸ Couldn't find that app.」というエラーが出てきた時の解決方法	https://qiita.com/uot/items/24cb9efe8d18fbfa7d5f	はと気づいた先ほどherokucreateで一度違う、アプリを作成してしまっていた。	2021-08-12 22:12:14
海外TECH	Ars Technica	Facebook may be forced to sell Giphy one year after buying it	https://arstechnica.com/?p=1786716	buying	2021-08-12 13:49:15
海外TECH	DEV Community	Tech Talk: How to prevent the collapse of society by building an accessible web	https://dev.to/whitep4nth3r/tech-talk-how-to-prevent-the-collapse-of-society-by-building-an-accessible-web-14dn	Tech Talk How to prevent the collapse of society by building an accessible webTalk starts at View slides on Speaker Deck TranscriptHow to prevent the collapse of society by building an accessible web Hi friends I m Salma I help developers build stuff learn things and love what they do If you ve seen me on the internet already you might know me as whitepnthr or white p nth r if you use a screenreader I am a Developer Evangelist for Contentful and if you ve never heard of Contentful it s a headless CMS with a REST API GraphQL API generous free community plan limits and some great CLI tooling and other packages to help you build great stuff Stephen Hawking said I believe that life on earth is at an ever increasing risk of being wiped out by a disaster such as a sudden nuclear war or genetically engineered virus or other dangers It s The apocalypse has arrived The internet is running on a slow G connection and display screens are broken And this is what people are now Googling for ーhow to build a fallout shelter And accessibility on the web is paramount to the survival of the human race So how do we prepare the web for the apocalypse of And why is this important now Let s first talk about accessibility for slow connectionsThere are almost two billion websites in the world and of those websites use JavaScript And why is this bad news for the apocalypse Let s take a look at the network tab of mobile twitter com On the first request it loads javascript files worth megabytes compressed other files and nine image files If we look at Lighthouse Dev Tools we ll see that the time to interactive is seconds and on the original trace of the page you see absolutely nothing on that first load That s a lot of requests for JavaScript And they re pretty expensive It takes time to load ーplus ーit might fail Here s a tweet from where our monitoring tells us that around one percent of requests for JavaScript on BuzzFeed time out and that s around million requests per month That s million failed requests for JavaScript each year for BuzzFeed alone And that s potentially that many failed JavaScript requests on the web each year Assuming that all websites that use JS have the same traffic as BuzzFeed In the apocalypse time to interactive is the difference between life and death People need to know how to fight off those zombies as quickly as possible So how can we serve critical content faster Do we abandon JavaScript The Jamstack has gone some way to try and solve this problem The Jamstack is an architecture designed to make the web faster more secure and easier to scale The key feature of the Jamstack is pre rendering ーwhere the entire front end is pre built into highly optimised static pages and assets during a build process and then enhanced with JavaScript You might have heard of some of the most popular static site generators ーNuxt js which uses Vue Universal which uses Angular and Next js which uses React But does modern Jamstack really solve this problem that we saw with Twitter Here s my website and the network tab It s built with Next js and hosted on Vercel On a normal load of this site in a browser it loads more than javascript files on the client The first document to load is the HTML document But why do we need all that JavaScript when the document has already loaded and the Jamstack is telling us that our pages are pre rendered and served statically Let s do an experiment and let s turn off JavaScript on my website Here it is You can see the blocked requests in the network tab ーJavaScript is disabled But as you can see it still loads It still works Let s compare this site with JavaScript disabled and JavaScript enabled The load time for the JavaScript disabled site is milliseconds compared to milliseconds And that is on a normal speedy connection in the UK What if we switched that to slow G which the apocalypse will be using The load times are incredibly different without JavaScript ー seconds and with JavaScript over seconds And the sizes of these pages are phenomenally different kilobytes for no JavaScript versus megabytes using JavaScript And that s compressed The uncompressed sizes are even greater in difference megabytes to load the same site with JavaScript enabled I did another experiment To test this theory I wanted to see how low we can get the size of the page and the load time of the page without JavaScript So the first thing is I recreated my blog article list fetching data at build time statically generated on Next js kb loaded in just under seconds I created the same page but loaded all the data on the client without JavaScript We obviously get no content because there s no JavaScript to load it ーand it s only slightly less than kb loads in just about five seconds again So what if we could turn this into a static HTML page no framework HTML and CSS no JavaScript kb in seconds So what s very interesting is that the statically generated Next js version s actually very very comparable to my static HTML page ーalthough my static HTML page does kind of win So these Jamstack frameworks are pretty good And so in terms of accessibility for slow connections you can remove as much JavaScript as possible Harness these Jamstack frameworks ーbut always use your judgment I was still able to get the load time and the page weight down So what I recommend for accessibility for slow connections websites must work without JavaScript in the apocalypse Decrease your load time decrease your page weight Because there is no progressive enhancement in the apocalypse There s just simply no time Accessibility for broken screensIn the apocalypse screens are broken Everything is a wasteland You don t see fancy website designs and animations anymore There are almost two billion websites in the world and of those websites use CSS And why is this bad news for the apocalypse developers google com tells us that by default CSS is treated as a render blocking resource meaning that the browser won t render any processed content until the CSS object model is constructed This page recommends that we keep our CSS lean deliver it as quickly as possible and use media types and queries to unblock rendering I say in the apocalypse let s not do that Because in the apocalypse time to interactive is the difference between life and death How can we serve critical content faster Do we also abandon CSS You might have noticed I like tattoos There s a big saying in the tattoo industry ーgo big or go home In this case I say go small or go die So let s take that static HMTL page and make it as small as possible Let s remove all CSS and class names Every byte counts Let s remove useless font imports We can t see them on broken screens Let s remove SVGs ーwe don t need those bytes Let s turn these links into just really simple links that don t even need any aria labels or anything like that And a little trick I found as well I m going to replace the favicon with a sneaky zero kilobyte favicon You might notice that in the network tab if you don t have a favicon on your site ーthe browser will throw a I found a little way to make a base encoded string masquerade as a favicon It s zero kilobytes We just put that string into our head and there we go So here s what my page looks like now It actually looks pretty well laid out We ve got links we ve got sections we ve got lists ーand it actually looks very much like this very iconic website It s lightweight It s responsive And it just works So how does my no CSS page compare to my HTML with CSS So here we go ーkb versus kb ーand on slow G ー seconds versus And if we look at the Lighthouse performance on web dev measure ーeverything is That s going to rank really well in Google search results ーand we re going to get to that later In WebAim surveyed one million home pages for accessibilityAnd across those one million home pages over million distinct errors were detected That s an average of errors per page So what s going wrong It seems pretty broken Here s a breakdown of the most common failures from this report and let s look at these one by one and see what s going on Low contrast text of home pages ーand what s that caused by CSS ーand we already know we re going to abandon that but let s have a look I looked at some of the top websites in the world to try and find these errors and they were present on quite a few of them We ve got youtube com and this violation appears in the little copyright disclaimer on the sidebar Now you may think this doesn t matter really but let s have a look We ve got the HTML here and the colour contrast error is caused by this CSS rule The background and the foreground colours do not offer an accessible solution Using one of my favorite colour contrast checker tools actually built by an ex colleague of mine you can see here that on three out of four of the criteria that color contrast fails If we remove CSS we don t even need to think about this Next missing alternative text for imagesOn of homepages What s this caused by The HTML Now you re going to see a running theme as I look through all of these failures and we re going to start with AliExpress Now on AliExpress there is a rotating carousel on their home page full of lots and lots of images and links If we look at the accessibility tree in Chromium dev tools you ll see that it s just an image and you get no supporting information in that accessibility tree Here s the HTML div div div a link with no information and an image with no alternative text And what s very very interesting is that AliExpress has chosen to hide the whole carousel for screen readers maybe with the assumption that if it s hidden ーit doesn t matter And I don t agree with that accessibilitydeveloperguide com says Whenever you think about hiding something from any audience better ask yourself whether this is really a good solution Most of the time it s better to create a solution that works the same way for everybody which does not need any shaky aria Let s look at the fix for this violation On AliExpress add an alt tag ー This is a great image description and we ll get to this later ーbut if you want to avoid cumulative layout shift add a height and width on the image as well Missing form input labelsOn of home pages again caused by incorrect HTML I spent a long time trying to find an example of this and what s interesting is that if a placeholder is present in the input field screenreaders and accessibility trees kind of get around that and give you some information However I did put a call out on Twitter to ask if anybody had any examples of HTML forms without labels and placeholders A wonderful member of the community Alex said he had a gimmicky one on his page to do redirects And this was like gold dust to me This was an absolutely abysmal experience for screenreaders and let s look at what s happening It looks pretty cool There s some ASCII art The instructions are to press enter to continue which redirects you to Alex s home page Here is what the HTML looks like We have a form we have an input field We have no labels we have no placeholders and in the accessibility tree we have no information And furthermore when you focus on this element with VoiceOver on Mac it reads out to you ー edit text blank main It s not really what you re expecting when you land on a So my question is does this page really need a form Is this HTML giving meaning to what needs to be done on that page Furthermore a fun little easter egg ーif you focus on the ASCII art in its current state with VoiceOver it reads this out to you underscore new line forward slashs pace underscore space back slash space undercore underscore underscore underscore etc and there is a good fix for that where you can use aria labels and roles to allow the screenreader to know what that is You add role image and an aria label And when you focus on that now with a screen reader you getmore contextual information about what s on the page It s a pretty fancy page for a I think I d prefer my s to be functional especially when we re in an apocalypse Now for a moment let s talk about placeholdersAs I mentioned earlier placeholders actually are not labels wschools com says The placeholder attribute specifies a short hint that describes the expected value of an input field e g a sample value or a short description of the expected format Let s go back to AliExpress When you refresh the page on AliExpress you get a new contextual placeholder It told me to search for true love Starbucks fancy underwear and car accessories In the accessibility tree the placeholder says true love ーwhich is fair enough But there is no label on the form If I focus on that input with a screen reader I don t actually know what that form is for ーespecially when the placeholder is changing on every load of the page Without a label that placeholder is meaningless So what does a good form input look like We have a label and we tell the HTML the DOM what input that label is for using the for and the id attributes We give the input a contextual placeholder ーhere it s first name ーand that is going to really help you out when you can t see that screen Let s go on to empty links of home pages ーagain caused by HTML And we go back to AliExpress In the footer of AliExpress there are a set of social links They are empty They are full of non breaking spaces ーand the accessibility tree tells us no information apart from space When we focus on those links as a screen reader user ーas someone without a working display ーI m going to ask myself what will happen if I click on this link And it s not just empty links that are problematic Let s take a look at the basket icon on AliExpress Again there is a text of zero inside that when I m hovering over that with a screen reader ーwhen I m focused on it I ve gone through the input field that says true love I go to the basket icon and it just reads out zero Here s the HTML A link an icon and zero And when I focus on it with a screen reader it reads out to me link zero I don t know where that link is going ーI m not going to want to click on it I m going to be asking myself again ーwhat even is this Let s look at the fix Add an aria label onto the link Make it descriptive How about You have zero items in your basket Go to basket Tell the user what they re going to do if they click on that link Missing document language attribute of home pages again caused by the very opening tag of your HTML accessibilitydeveloperguide com says In the example of a screen reader the synthesiser needs to know which language the content is in order to pronounce the output correctly Otherwise it will be hard to understand even if you know the other language We go back to AliExpress and here you can see Axe Dev tools a great free Chromium extension to test accessibility There is no language attribute on the HTML and you can see here AliExpress have prioritised merging the Facebook and OpenGraph schema into their HTML before they ve thought about language The fix Very simple Add lang equals whatever your language is on the HTML Finally we come to empty buttons of home pages ーagain caused by HTML but in this case ーit s also caused by CSS which we re going to abandon We go to a product page of AliExpress and there are two buttons on this page that presumably increment and decrement the amount of items you would like to add to your basket When using VoiceOver when you focus on this element it just reads out button ーno one is going to click that if they don t know what it s for Here is the HTML It s a button element with an icon element inside it So how is that plus and minus added With CSS pseudo elements And what s really interesting is this character is not actually supported by a lot of browsers and also my VSCode I presume they mean a plus but literally in the CSS inspector the character is unrecognised And I had to bring the WAT duck out for that The fix Give a fallback to your button Put a plus in there Give it an aria label that tells the users what they re going to do when they click on that button Give it some meaning So when we have a look at all of these most common failures they re caused by incorrect CSS and HTML They are not built for accessibility So what do we do for accessibility for broken screens in the apocalypse Don t fake content with css Put it there in the DOM Use semantic HTML Use forms where it s appropriate Don t break the web Because if the web is unusable in the apocalypse ーeveryone dies So we re talking about the apocalypse is years off ーbut why is all of this important now Let s quickly recapHow do we prepare the web for the apocalypse of we start with semantic HTML We use minimal CSS and we use as little JavaScript as possible And why is this important now Worldwide the internet is slowworldpopulationreview com did a survey on internet speeds by country in and the average speed in the world is megabits per second If we look at the code from Chromium Dev Tools the slow G simulated connection is megabits per second These are pretty much the same So all of the results you ve seen when I had slow G in my dev tools ーloading that page with JavaScript ーthe results are going to be very similar for a lot of people around the world They are not going to survive if pages take that long to load Furthermore globally at least billion people have a near or distance vision impairmentI m one of them I have really bad eyes ーI can t see Those of you who have seen me live streaming know that I miss placeholders all the time when they are really low contrast And also not all users of screen readers have vision impairments Here s a survey by WebAim in and it shows here that not everyone is blind who answered this survey Some people have cognitive disabilities some people are deaf some people have motor disabilities So it s not just blind people who use these ーthere are a lot more people you re affecting if you don t build accessible websites And lastly as of this month Google now uses Core Web Vitals as a ranking factor in search resultsSo what are the Core Web Vitals We ve got the largest contentful paint which means how quickly does the page render We ve got the first input delay ーhow quickly does the page respond to user input And we ve got cumulative layout shift ーhow stable is the page layout So in order to make the most out of search rankings and Google Core Web Vitals what do we need to do We need to get our content to our users as fast as possible We need to make our web applications usable as soon as possible and we need to make our web applications as stable as possible ーor we risk being forgotten in the apocalypse Billions of people use the internet on a slow connection and millions of people use the internet via a screen reader People won t find your website if it s not performant or accessible The apocalypse of might not happen but if it does Hopefully with this information we ll be prepared My name is Salma or whitepnthr I encourage developers to build stuff learn things and love what they do You can find me on all of these social platforms as whitepnthr Thank you very much I ve had a lovely time	2021-08-12 13:41:37
海外TECH	DEV Community	Clean CSS: How to Spring Clean your Project	https://dev.to/taxdoo/clean-css-how-to-spring-clean-your-project-k4	Clean CSS How to Spring Clean your ProjectIllustration by Ashley Allen Taxdoo Graphic DesignerWe ve all been there a new project drops onto your team s plate and it s a scramble to hit the deadline What usually gets hit hardest CSS styling Short deadlines sub standard architecture or lacking guidelines means that often CSS becomes the problem child in terms of delivering clean code At Taxdoo we use a range of styling methods for our frontend projects however a prime example of CSS styling can be seen in our website Like many company s websites Taxdoo com is the digital shop door for the thousands of customers who visit our site daily An inhouse built site made with React we are constantly looking for ways to optimise the performance aesthetics and functionality of our key marketing tool What is clean code Epitomised by software expert Robert Cecil Martin s otherwise known as Uncle Bob book Clean Code A Handbook of Agile Software Craftmanship clean code refers to agile principles of software development that aim to create code that is simple to understand or change Dead code refers to code that is not used when an application is run What is clean code for CSS In CSS short for Cascading Style Sheets is the way that property values are applied to the content as a hierarchy Child elements can either inherit or override properties values from the parent elements If this hierarchy is not properly adhered to or the team uses bad practices it can seriously affect a website s performance That s why it is important to optimize and try to keep the CSS clean Over time while we add more features or just small modifications to HTML elements the CSS can grow quickly and it becomes a challenge to maintain especially if you don t stick to the YAGNI principle You aren t gonna need it only code the functionality that it is needed in mind Eventually you need to delete unused CSS or optimize it CSS frameworks can take a project load to KB of CSS or more which is a lot and can take a long time to render This size is also possible when you have a lot of templates and pages and if you aren t using all of it having tools to reduce size and delete dead code is totally worth it Why is it good to remove dead code Dead CSS will affect the rendering time of your website Using Lighthouse provides a good overview of potential savings you could make in load time by removing dead CSS as well as scoring your website on other categories such as SEO Performance Accessibility and Best Practices How do we detect dead code One of the tools that we like to use is Coverage from Google Chrome To open this feature from Chrome you need to open the Developer tools and click coverage in the dots at the bottom left There we will see a list of JS CSS files with bars in red and blue color The red color means the amount of code unused and the blue color is used It also shows the percentage of unused Bytes Whenever you click one of those elements from the list it will open that file and you can check which part is not being used because it will show a red bar next to it This is only visible for the page you are in when you visit more pages or do more actions in the page this will get updated Seeing a lot of red doesn t really mean you should delete it It could be used in another part of the website so do not take this chance to delete them because you could end up with big styling problems To know if a CSS selector is not being used you need to check every single page or state of your site and execute all javascript This tool is useful to get an idea if a piece of CSS is being used for example if we have a specific component we visit that component and see how much unused CSS we have Other ways to detect dead CSSTo analyse your code and find unused CSS you can use several automated tools PurifyCSSPurgeCSSUnCSSUnusedCSSPurifyCSS and PurgeCSS are the most frequently used ones and they can be integrated in the build process while UnusedCSS is a website that checks and gives you a report of your CSS usage To avoid having unused CSS make sure that you scope your components and maintain a good structure It is difficult to have unused CSS with smaller components since if the component is removed so is the component s CSS However if you end up with a bigger project or your components grow a lot it s worth regularly checking your CSS and trying to clean it What do you use to detect or remove dead code At Taxdoo we emphasise knowledge sharing and hope that you found this article was useful Stay in touch by following us on Twitter Alternatively you can check out our open vacancies here	2021-08-12 13:26:22
海外TECH	DEV Community	Data Analyst Complete Roadmap 2021	https://dev.to/inncod/data-analyst-complete-roadmap-2021-181i	Data Analyst Complete Roadmap Named the  sexiest job of the st century by Harvard Business Review the field of data science has rapidly become one of the most sought after for professionals from a variety of backgrounds Data Analyst s lie close to the top of the food chain with healthy salaries and benefits What Do Data Analysts Do A data analyst collects processes and performs statistical analysis of data i e makes the data useful in one way or another way They help other people make the right decisions and prioritize the raw data that has been collected to make work easier using specific formulas and applying the right algorithms If you re passionate about numbers algebraic functions and enjoy sharing your work with other people then you will excel as a data analyst Here s an overview of the role to help lay a roadmap to your success Skills Required to Become a Successful Data AnalystMicrosoft Excel The data is of no use if it is not structured correctly Excel provides a suite of functionality to make data management convenient and hassle free Basic SQL skillsBasic web development skills Ability to find patterns in large data sets Data mapping skills Ability to derive actionable insights from processed data At one end of the spectrum data analysis overlaps with statistics and higher mathematics while at the other it merges seamlessly with programming and software development Programming Skills for a Data Analyst CareerR and Python are two of the most popular programming languages for data analysts to learn While R supports statistical computing and graphics Python s ease of use makes it a good language for use in large projects R ProgrammingWhen talking about R there are certain areas that you should focus on to get a good grasp of the language and your work Dplyr acts as a bridge between R and SQL It not only translates the codes in SQL language but it also works hand in hand with both types of data ggplot is a system that helps users build plots iteratively which can be edited later if necessary based on the graphics Further two Ggplot sub systems are useful ggally helps prepare network plots and ggpairs matrix reshape this is based on two formats meta and cast While meta converts data from broad format data to long format data the cast does the opposite PythonPython is one of the simplest programming languages which beginners tend to prefer These packages or libraries will give you a head start in the data analyst world numpy pandas matplotlib scipy scikit learn ipython ipython notebooks anaconda and seaborn StatisticsProgramming is of no use if the data is not interpreted correctly If we are talking about data statistics will always enter the picture Many statistical skills are necessary to build a successful data analyst career path such as forming data sets basic knowledge of mean median mode SD and other variables histograms percentiles probability ANOVA chaining and distributing the data in certain groups correlation causation and more MathematicsData analytics is a game of numbers If you are good with numbers this is the way to go Advanced knowledge of matrices and linear algebra relational algebra CAP theorem framing data and series are also essential to succeed as a data analyst Machine LearningMachine learning is one of the most powerful skills to learn if you want to become a data analyst It is essentially a combination of multivariable calculus and linear algebra along with statistics You don t need to invest in any of the machine learning algorithms as you need to upgrade your skills There are three kinds of machine learning In supervised learning the computer algorithm learns in two stages the learning phase and the test phase In the first stage the computer learns and adapts to the learning while in the second it comes alive For example with a modern smartphone voice identification first determines the user s authentic voice and intonation before applying it to future use cases The tools that you would be using are logistic regression decision trees support vector machines and Naive Bayes classification Unsupervised learning is when there are multiple relationships between several items and a suggestion engine delivers real time suggestions A good example is Facebook s friends list The tools that you would be using are Principal Component Analysis Singular Value Decomposition clustering algorithms and Independent Component Analysis Reinforcement learning is a space between supervised learning and unsupervised learning where there is a chance of either improvement or going the extra mile The tools that you would use include TD Learning Q Learning and genetic algorithms Data WranglingIn a sense  data wrangling is where all the research data comes together to form a single cohesive whole In data wrangling raw data is transformed into properly structured logical sets that are workable For this you may need to work with both SQL and noSQL based databases which act as central hubs A few examples include PostgreSQL Hadoop MySQL MongoDB Netezza Spark Oracle etc Communication and Data VisualizationThe job of a data analyst is not limited to data interpretation and reporting Data analysts are also expected to communicate insights derived to all the stakeholders involved Knowledge of visual encoding tools like as ggplot matplotlib d js and seaborne is essential to accomplish this effectively Data IntuitionLet s suppose you work in an organization as a data analyst You have analyzed a set of data and have submitted your report to the team so that they can begin their work Before commencing work on the project the team may have a few questions to get a proper understanding of the project and how the data could be used But you might not have enough time to answer all of these questions That s where data intuition steps in With experience you learn what questions are likely to be raised and how to curate a set of answers that addresses all blind spots This will also help you categorize questions as good to know or need to know Tasks Performed by Data AnalystsGathering and extracting numerical data Finding trends patterns and algorithms within the data Interpreting the numbers Analyzing market research Applying these decisions back to the business To be a successful data analyst you need to have a passion for numbers the ability to extract useful insights from processed data and the skill to present these insights in the visual form accurately These skills cannot be learned overnight With patience hard work and the right guidance anything is possible And yes it all begins with a plan Begin Your Training with Our Data Analyst Master s ProgramIf you re ready to take the next step by earning your certification in data analysis you ve come to the right place At dev to we re excited to announce our partnership with IBM is one of our newest online learning programs the Data Analyst Course Data Analytics Bootcamp teaches students the ins and outs of data analysis and includes everything from fundamentals to advanced principles Students learn an array of advanced analytics tools  data visualization tools and programming tools all of which are essential to thrive in a data analyst role If you re interested in becoming a Data Science expert then we have just the right guide for you The Data Science Roadmap will give you insights into the most trending technologies the top companies that are hiring the skills required to jumpstart your career in the thriving field of Data Science and offers you a personalized roadmap to becoming a successful Data Science expert	2021-08-12 13:16:04
海外TECH	DEV Community	Sidekiq's sidekiq_retries_exhausted hook	https://dev.to/morinoko/sidekiq-s-sidekiqretriesexhausted-hook-3d0e	Sidekiq x s sidekiq retries exhausted hooksidekiq retries exhausted is a Sidekiq hook that you can use to do something after Sidekiq has used up all of its retries but the job still failed It s a good way to make sure you send a failure notification or log an error that might be causing the job to fail instead of it just failing silently In the worker you can set a specific number of retries if you want with sidekiq options retry lt some number gt The default is times Here are a couple of examples but there are ton of ways to configure this which can be found in the documentation Retry times before giving upsidekiq options retry Don t retry at allsidekiq options retry falseIf the job has used up exhausted all of its retries Sidekiq moves it to the Dead set and it will eventually get discarded Sidekiq will call the sidekiq retries exhausted hook right before moving the job to the dead set if you define it in the worker sidekiq retries exhausted takes a block and receives the queued message as an argument so you can use it to compose a log message See below for an example class MyWorker include Sidekiq Worker sidekiq options retry sidekiq retries exhausted do msg exception example with using Rails logger Rails logger warn Failed msg class with msg args msg error message error exception end def perform my arguments do some work endendThis hook is worker specific so you would define sidekiq retries exhausted for each worker you need There is also a way to send a job death notice for all workers globally by adding some configuration in the initializer in Rails that would be the config initializers sidekiq rb file Sidekiq configure server do config other config stuff config death handlers lt lt gt job ex do Rails logger error Uh oh job class job jid just died with error ex message endend ReferencesSidekiq error handling documentationSource code for sidekiq retries exhaustedSidekiq job retries documentation	2021-08-12 13:07:41
Apple	AppleInsider - Frontpage News	Satechi introduces the USB-C Clamp Hub for 24-inch iMac	https://appleinsider.com/articles/21/08/12/satechi-introduces-the-usb-c-clamp-hub-for-24-inch-imac?utm_medium=rss	Satechi introduces the USB C Clamp Hub for inch iMacThe USB C Clamp Hub by Satechi is a six port hub that allows access to USB A ports from the front of your inch iMac The Satechi USB C Clamp Hub fastens to the bottom of your iMacThe latest hub from Satechi is designed exclusively for the inch iMac It adds six easy access ports to the front of the iMac with a simple silver aluminum finish Read more	2021-08-12 13:40:00
海外TECH	Engadget	TikTok limits the visibility of teens' videos amid safety push	https://www.engadget.com/tiktok-limits-teen-access-130931754.html?src=rss	TikTok limits the visibility of teens x videos amid safety pushTikTok s determination to clean up its feeds now includes significant limits on its app for the teenage crowd The social video service is limiting the visibility of teens videos with the most restrictions applying to the youngest users Teens aged to are set to private by default and will have to decide who can see a video the first time they post They ll have that option for every video they post beyond that and they won t have access to Duet or Stitch features Older teens will see restrictions too TikTok will turn off Direct Messages by default for and year olds joining the service for the first time and ask existing users to review their settings if they haven t tried DMs before The company will also double check before those older teens enable downloads for their videos The social media giant will try to promote healthy usage habits too Notifications will turn off for teens under starting at PM local time while and year olds will receive their alerts until PM This will theoretically help teens wind down not to mention discourage late night bullying TikTok stressed that there was quot no finish line quot for privacy and safety efforts and that there would be more to come in the months ahead The focus is clear however ーTikTok doesn t want stories of teens facing bullies creeps and other abusers that found them through public videos and unsolicited messages In theory the restrictions provide a gentler introduction to TikTok that helps younger audiences understand the consequences of their actions	2021-08-12 13:09:31
ニュース	BBC News - Home	Afghanistan: Taliban take 10th provincial capital as Ghazni falls	https://www.bbc.co.uk/news/world-asia-58184202	afghan	2021-08-12 13:44:43
ニュース	BBC News - Home	England v India: Rohit Sharma's top edge sees Mark Wood's delivery go for six	https://www.bbc.co.uk/sport/av/cricket/58189262	England v India Rohit Sharma x s top edge sees Mark Wood x s delivery go for sixWatch as Rohit Sharma s huge top edge sees Mark Wood s short delivery fly over fine leg for the first six of the day during the second Test at Lord s between England and India	2021-08-12 13:38:39
ニュース	BBC News - Home	GCSE results 2021: Will employers judge Covid grades badly? And other questions	https://www.bbc.co.uk/news/education-58149810	exams	2021-08-12 13:50:21
ニュース	BBC News - Home	What are the rules and guidance for face masks and coverings?	https://www.bbc.co.uk/news/health-51205344	england	2021-08-12 13:01:02
LifeHuck	ライフハッカー［日本版］	Kindle本7000冊以上が50％ポイント還元！話題の新書や小説がお得に	https://www.lifehacker.jp/2021/08/239437amazon_kindle_kobunsha.html	Kindle本冊以上がポイント還元話題の新書や小説がお得にKindleストアでは、現在Kindle本夏のキャンペーンを実施中。	2021-08-12 22:35:00
LifeHuck	ライフハッカー［日本版］	魚や生卵は？ 機内に持ち込めるちょっと意外な物品たち	https://www.lifehacker.jp/2021/08/weird-things-you-didnt-know-you-can-bring-on-an-airpla.html	持ち込み	2021-08-12 22:05:00
北海道	北海道新聞	旭川道議補選９月２６日投開票　市長選、市議補選と「トリプル選」	https://www.hokkaido-np.co.jp/article/577668/	補欠選挙	2021-08-12 22:18:26
北海道	北海道新聞	カムチャツカで観光ヘリ墜落　８人行方不明	https://www.hokkaido-np.co.jp/article/577620/	行方不明	2021-08-12 22:15:55
北海道	北海道新聞	ＮＹ円、１１０円半ば	https://www.hokkaido-np.co.jp/article/577728/	外国為替市場	2021-08-12 22:14:00
北海道	北海道新聞	まん延防止、小樽と石狩管内も　知事方針、１４～３１日酒類停止	https://www.hokkaido-np.co.jp/article/577724/	新型コロナウイルス	2021-08-12 22:05:57
仮想通貨	BITPRESS（ビットプレス）	[Bloomberg] 2兆ドルに迫る仮想通貨市場、米インフラ法案で税務報告義務に直面	https://bitpress.jp/count2/3_9_12698	bloomberg	2021-08-12 22:11:53
仮想通貨	BITPRESS（ビットプレス）	[ロイター] サッカー＝パリSG移籍のメッシ、契約金の一部は暗号資産	https://bitpress.jp/count2/3_9_12697	移籍	2021-08-12 22:08:19