{"id":605388,"date":"2025-04-02T12:15:17","date_gmt":"2025-04-02T17:15:17","guid":{"rendered":"https:\/\/towardsdatascience.com\/?p=605388"},"modified":"2025-06-13T10:18:35","modified_gmt":"2025-06-13T15:18:35","slug":"pyscript-vs-javascript-a-battle-of-web-titans","status":"publish","type":"post","link":"https:\/\/towardsdatascience.com\/pyscript-vs-javascript-a-battle-of-web-titans\/","title":{"rendered":"PyScript vs. JavaScript: A Battle of Web Titans"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><mdspan datatext=\"el1743466709098\" class=\"mdspan-comment\">We\u2019re delving<\/mdspan> into frontend web development today, and you might be thinking: what does this have to do with data science? Why is Towards Data Science publishing a post related to web dev?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Well, because data science isn\u2019t only about building powerful models, engaging in advanced analytics, or cleaning and transforming data\u2014<strong>presenting the results is also a key part of our job<\/strong>. And there are several ways to do it: PowerPoint presentations, interactive dashboards (like Tableau), or, as you\u2019ve guessed, through a website.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Speaking from personal experience, I work daily on developing the website we use to present our data-driven results. Using a website instead of PowerPoints or Tableau has many advantages, with <strong>freedom and customization<\/strong> being the biggest ones.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Even though I\u2019ve come to (kind of) enjoy JavaScript, it will never match the fun of coding in Python. Luckily, at FOSDEM, I learned about <strong>PyScript<\/strong>, and to my surprise, it\u2019s not as alpha as I initially thought.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But is that enough to call it a potential JavaScript replacement? That\u2019s exactly what we\u2019re going to explore today.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript has been the king of web development for decades. It\u2019s everywhere: from simple button clicks to complex web apps like Gmail and Netflix. But now, there\u2019s a challenger stepping into the ring\u2014<strong>PyScript<\/strong>\u2014a framework that lets you run <strong>Python in the browser<\/strong> without needing a backend.Sounds like a dream, right? Let\u2019s break it down in an entertaining <strong>head-to-head battle<\/strong> between these two web technologies to see if PyScript is a true competitor!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Round 1: What Are They?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is like the Jake Paul vs Mike Tyson battle: the new challenger (PyScript) vs the veteran champion (JS). Don\u2019t worry, I\u2019m not saying today\u2019s battle will be a disappointment as well.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Let\u2019s start with the veteran: <strong>JavaScript<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\">Created in 1995, JavaScript is the <strong>backbone of web development<\/strong>.<\/li>\n\n\n\n<li class=\"wp-block-list-item\">Runs natively in browsers, controlling everything from user interactions to animations.<\/li>\n\n\n\n<li class=\"wp-block-list-item\">Supported by <strong>React, Vue, Angular<\/strong>, and a massive ecosystem of frameworks.<\/li>\n\n\n\n<li class=\"wp-block-list-item\">Can directly <strong>manipulate the DOM<\/strong>, making web pages dynamic.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Now onto the novice: <strong>PyScript<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\">Built on <strong>Pyodide<\/strong> (a Python-to-WebAssembly project), PyScript lets you write <strong>Python inside an HTML file<\/strong>.<\/li>\n\n\n\n<li class=\"wp-block-list-item\">No need for <strong>backend servers<\/strong>\u2014your Python code runs directly in the browser.<\/li>\n\n\n\n<li class=\"wp-block-list-item\">Can import Python libraries like NumPy, Pandas, and Matplotlib.<\/li>\n\n\n\n<li class=\"wp-block-list-item\"><strong>But\u2026<\/strong> it\u2019s still evolving and has limitations.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This last <em>but<\/em> is a big one, so JavaScript wins the first round!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Round 2: Performance Battle<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When it comes to speed, JavaScript is like Usain Bolt\u2014optimized and <strong>blazing fast<\/strong>. It runs natively in the browser and is fine-tuned for performance. On the other hand, PyScript runs Python via WebAssembly, which means <strong>extra overhead<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Let\u2019s use a real mini-project: a simple counter app. We\u2019ll build it using both alternatives and see which one performs better.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">JavaScript<\/h3>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-markup\">&lt;button onclick=&quot;increment()&quot;&gt;Click Me&lt;\/button&gt;\n&lt;p id=&quot;count&quot;&gt;0&lt;\/p&gt;\n&lt;script&gt;\n  let count = 0;\n  function increment() {\n    count++;\n    document.getElementById(&quot;count&quot;).innerText = count;\n  }\n&lt;\/script&gt;\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">PyScript<\/h3>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-python\">&lt;py-script&gt;\nfrom pyscript import display\ncount = 0\n\ndef increment():\n    global count\n    count += 1\n    display(count, target=&quot;count&quot;)\n&lt;\/py-script&gt;\n&lt;button py-click=&quot;increment()&quot;&gt;Click Me&lt;\/button&gt;\n&lt;p id=&quot;count&quot;&gt;0&lt;\/p&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Putting them to the test:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\">JavaScript runs instantly.<\/li>\n\n\n\n<li class=\"wp-block-list-item\">PyScript has a noticeable delay.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">End of round: JS increases its advantage making it 2-0!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Round 3: Ease of Use &amp; Readability<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Neither of both languages is perfect (for example, neither includes static typing), but their syntax is very different. <strong>JavaScript<\/strong> can be quite messy:<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-javascript\">const numbers = [1, 2, 3];\nconst doubled = numbers.map(num =&gt; num * 2);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">While <strong>Python<\/strong> is far easier to understand:<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-python\">numbers = [1, 2, 3]\ndoubled = [num * 2 for num in numbers]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The fact that PyScript lets us use the Python syntax makes it the round winner without a doubt. Even though I\u2019m clearly biased towards Python, the fact that it\u2019s beginner-friendly and usually more concise and simple than JS makes it better in terms of usability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The problem for PyScript is that JavaScript is already deeply integrated into browsers, making it more practical. Despite this, PyScript wins the round making it 2-1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One more round to go\u2026<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Round 4: Ecosystem &amp; Libraries<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript has countless frameworks like React, Vue, and Angular, making it a powerhouse for building dynamic web applications. Its libraries are specifically optimized for the web, providing tools for everything from UI components to complex animations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On the other hand, PyScript benefits from Python\u2019s vast ecosystem of scientific computing and data science libraries, such as NumPy, Pandas, and Matplotlib. While these tools are excellent for data visualization and analysis, they aren\u2019t optimized for frontend web development. Additionally, PyScript requires workarounds to interact with the DOM, which JavaScript handles natively and efficiently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While PyScript is an exciting tool for embedding Python into web applications, it\u2019s still in its early stages. JavaScript remains the more practical choice for general web development, whereas PyScript shines in scenarios where Python\u2019s computational power is needed within the browser.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here\u2019s a table summarizing some of the key components&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Feature<\/td><td>JavaScript<\/td><td>PyScript<\/td><\/tr><tr><td>DOM Control<\/td><td>Direct &amp; instant<\/td><td>Requires JavaScript workarounds<\/td><\/tr><tr><td>Performance<\/td><td>Optimized for browsers<\/td><td>WebAssembly overhead<\/td><\/tr><tr><td>Ecosystem<\/td><td>Huge (React, Vue, Angular)<\/td><td>Limited, still growing<\/td><\/tr><tr><td>Libraries<\/td><td>Web-focused (Lodash, D3.js)<\/td><td>Python-focused (NumPy, Pandas)<\/td><\/tr><tr><td>Use Cases<\/td><td>Full web apps<\/td><td>Data-heavy apps, interactive widgets<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Round\u2019s verdict: JavaScript dominates in general web dev, but PyScript shines for Python-centric projects.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Final Verdict<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This was a quick fight! We still don\u2019t know who won though\u2026<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Time to reveal it:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\">If you\u2019re building a full web app,&nbsp; JavaScript is the clear winner.<\/li>\n\n\n\n<li class=\"wp-block-list-item\">If you\u2019re adding Python-powered interactivity (e.g., data visualization), PyScript could be useful.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">With that said, it\u2019s fair to say that <strong>JavaScript (and its derivatives) still remains the web\u2019s frontend best option<\/strong>. However, the future of PyScript is one to watch: If performance improves and it gets better browser integration, PyScript could become a strong hybrid tool for Python developers willing to incorporate more data-related tasks on the frontend.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Winner: JavaScript.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Can Python really replace JavaScript for web development?<\/p>\n","protected":false},"author":18,"featured_media":605389,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"is_member_only":false,"sub_heading":"Can Python really replace JavaScript for web development?","footnotes":""},"categories":[25],"tags":[448,508,523,4124,712],"sponsor":[],"coauthors":[30752],"class_list":["post-605388","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programming","tag-data-science","tag-data-visualization","tag-javascript","tag-pyscript","tag-web-development"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PyScript vs. JavaScript: A Battle of Web Titans | Towards Data Science<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/towardsdatascience.com\/pyscript-vs-javascript-a-battle-of-web-titans\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PyScript vs. JavaScript: A Battle of Web Titans | Towards 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