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PythonMastery
What it is
PythonMastery is a free browser workspace and learning site running Python 3.13 through Pyodide and WebAssembly. Its editor needs no installation or account and includes live syntax checking, find-and-replace, code folding, importable tabs, autosaved history, and a Stop button. NumPy, pandas, Matplotlib, scikit-learn, XGBoost, LightGBM, and statsmodels run in the browser according to the site. A notebook shares one Python session across cells, displays tables and plots inline, and imports or exports .ipynb files. Python Academy offers paths in fundamentals, data science, machine learning, AI, and deep learning, while Tutorial Lab provides quizzes and exercises. Code can be shared by URL or embedded in webpages and GitHub READMEs. The site says code, output, and datasets are not collected; uploaded files and preferences remain in the browser until removed or site data is cleared.
For and against
For
- Runs Python 3.13 in the browser
- Requires no installation or account
- Includes notebook and data-science libraries
- Offers structured learning paths and exercises
- Supports URL sharing and embeds
Against
- PyTorch and TensorFlow cannot run
- Uploaded files remain in browser storage
- Uses listed analytics and third-party services
The verdict
PythonMastery combines an in-browser Python editor, notebook, learning material, and practice activities without paid plans. Its WebAssembly environment has library limits, and browser storage and analytics policies are worth reviewing.
Who it suits
It suits learners and Python users who want browser-based coding without installation or login. Its responsive editor and lessons also support phones and tablets.
Plans and prices
Free
No paid plans · No feature paywalls · No account required
Read 8 Oct 2026 · pythonmastery.io
On the record
- Analytics and third parties
- The privacy policy names Google Analytics, Google Fonts, FormSubmit, ipapi.co, Open-Meteo, jsDelivr, and the Tailwind CDN, and describes when analytics runs and how to disable it.pythonmastery.io · read 8 Oct 2026
- Browser IDE
- PythonMastery runs Python 3.13 in the browser using Pyodide and WebAssembly, with no installation or account required.pythonmastery.io · read 8 Oct 2026
- Data science libraries
- NumPy, pandas, Matplotlib, and scikit-learn are built in, and the site says XGBoost, LightGBM, and statsmodels also run in the browser.pythonmastery.io · read 8 Oct 2026
- Data storage
- Uploaded files and editor preferences are stored in the user’s browser, and the privacy policy says uploaded files remain there until removed or browser site data is cleared.pythonmastery.io · read 8 Oct 2026
- Editor features
- The editor includes live syntax checking, find and replace, code folding, tabs that can import each other, autosaved history, and a Stop button.pythonmastery.io · read 8 Oct 2026
- Learning content
- Python Academy offers learning paths covering Python fundamentals, data science, machine learning, AI, and deep learning.pythonmastery.io · read 8 Oct 2026
- Maker details
- The site refers to its founder but does not identify the founder’s name, headquarters, or founding date on the opened pages.pythonmastery.io · read 8 Oct 2026
- Notable library limits
- The site says PyTorch and TensorFlow cannot run in its browser environment because neither has a WebAssembly build.pythonmastery.io · read 8 Oct 2026
- Notebook
- The browser notebook has cells that share a Python session, renders tables and plots inline, and supports importing and exporting .ipynb files.pythonmastery.io · read 8 Oct 2026
- Practice
- Tutorial Lab provides quizzes, quick tests, and exercises across Python, data science, machine learning, and AI.pythonmastery.io · read 8 Oct 2026
- Privacy
- The privacy policy says code, execution output, and uploaded datasets are not collected or stored, and that there is no account registration or login.pythonmastery.io · read 8 Oct 2026
- Sharing and embeds
- Users can share code by URL and embed runnable examples in a webpage or GitHub README; the site says embedded code runs in the reader’s browser.pythonmastery.io · read 8 Oct 2026
- Support
- The site provides a feedback form that it says is read by one person, with optional name and email fields and no autoresponder or mailing list.pythonmastery.io · read 8 Oct 2026
- Supported devices
- The site says its responsive editor and lessons work on phones and tablets, including portrait and landscape orientations.pythonmastery.io · read 8 Oct 2026
