Is PyRun completely free to use?

Yes — PyRun is entirely free. There is no sign-up, no subscription, and no hidden limit. You can write and run Python code as many times as you like without creating an account.

Does PyRun work without an internet connection?

After the first load, PyRun continues to work offline. The Python engine (Pyodide) is cached locally by your browser, so you can keep coding even when you have no internet access. Some features like link sharing require a connection.

Which version of Python does PyRun use?

PyRun runs Python 3.11 via Pyodide, a port of CPython compiled to WebAssembly. You get access to the full Python standard library, including modules like math, json, datetime, itertools, and more.

Is my code private? Does PyRun store what I write?

Your code never leaves your device unless you explicitly generate a public share link. All execution happens entirely inside your browser sandbox. PyRun has no server that receives or stores your code.

Can I use PyRun on a phone or tablet?

Yes. PyRun is built with a responsive layout and works on mobile browsers. The interface adapts to smaller screens, switching to a stacked layout so both the editor and output terminal remain accessible.

Can I import and open my own Python files?

Absolutely. You can open any .py file from your device using the toolbar button or with the Ctrl+O keyboard shortcut. The file loads directly into the editor, ready to run.

How do I share my code with someone else?

Use the Share button in the toolbar or press Ctrl+H. PyRun generates a unique URL that encodes your code. Anyone with the link can open it in their browser and see (or run) the exact same code.

Does PyRun support the input() function?

Yes. PyRun has full support for Python's built-in input() function. When your code reaches an input() call, the terminal prompts you to type a response, just as it would in a local terminal.

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Python Packages
Available Online

PyRun automatically detects the packages your code imports and loads them on demand using Pyodide's package registry and micropip. No pip install commands, no virtual environments — just write your import statement and run.

ScienceDataMLWebParsingGraphicsCryptoUtilities

Science

numpy

NumPy is the foundational package for scientific computing in Python. It provides a powerful N-dimen…

Numerical computing

scipy

SciPy builds on NumPy to provide a large collection of algorithms for scientific and technical compu…

Scientific computing

sympy

SymPy is a Python library for symbolic mathematics. Unlike NumPy and SciPy which work with numerical…

Symbolic math

networkx

NetworkX is the standard Python library for the creation, manipulation, and study of the structure, …

Graph algorithms

statsmodels

Statsmodels is a Python library that provides classes and functions for the estimation of many diffe…

Statistical analysis

Data

pandas

Pandas is the go-to Python library for data manipulation and analysis. It introduces two primary dat…

Data manipulation

matplotlib

Matplotlib is Python's most widely used plotting library. It lets you create publication-quality 2D …

Chart rendering

scikit-learn

Scikit-learn is Python's most popular machine learning library. It provides simple and consistent AP…

Machine learning

Web

requests

Requests is the most popular Python HTTP library, used to send HTTP/1.1 requests elegantly and simpl…

HTTP via micropip

Parsing

beautifulsoup4

BeautifulSoup4 (bs4) is a Python library for parsing HTML and XML documents. It creates a parse tree…

Web scraping

lxml

lxml is the most feature-complete Python library for processing XML and HTML. It combines the best o…

XML & HTML parsing

regex

The regex module is a drop-in replacement for Python's built-in re module, offering additional featu…

Advanced regex engine

Graphics

turtle

Python's turtle module is a classic teaching tool for introducing programming concepts through visua…

Browser graphics

Crypto

cryptography

The cryptography library is the leading Python package for cryptographic operations. It provides bot…

Encryption & hashing

Utilities

rich

Rich is a Python library for writing rich text to the terminal. It supports markdown rendering, synt…

Terminal styling

pydantic

Pydantic is the most widely used Python data validation library. It uses Python type annotations to …

Data validation

faker

Faker is a Python library that generates realistic-looking fake data: names, addresses, emails, phon…

Mock data generation

dataclasses

The dataclasses module is part of the Python standard library (Python 3.7+). It provides a decorator…

Typed data models

attrs

attrs (imported as attr) is a Python package that lets you write concise, correct Python classes wit…

Class boilerplate-free

arrow

Arrow is a Python library that offers a human-friendly approach to creating, manipulating, formattin…

Human-friendly dates

tabulate

Tabulate is a Python library for pretty-printing tabular data to the terminal. It supports dozens of…

Pretty-print tables

base64

The base64 module is part of the Python standard library and provides functions for encoding binary …

Encoding & decoding

pytz

pytz brings the Olson timezone database to Python. It allows accurate and cross-platform timezone ca…

Timezone conversions

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Python PackagesAvailable Online

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Python Packages
Available Online