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.

Python Random Password Generator

Generate secure, random passwords in Python. Learn to use the random module alongside string constants to build robust security tools.

Try Python Random Password Generator Code

How it Works

Password generators require accessing random number functions and mapping them to ASCII character sets.

The Python standard library provides `random` and `secrets` to perform unbiased random selections.

For cryptographic or high-security needs, Python’s `secrets` module is preferred over `random` as it is cryptographically strong.

Source Code

Combining uppercase, lowercase, numbers, and symbols to output a 16-character secure string.

password_gen.py

Try in Editor

import random
import string

def generate_password(length=12):
    # Combine all character sets
    characters = string.ascii_letters + string.digits + string.punctuation
    
    # Randomly select characters until the desired length
    password = ''.join(random.choice(characters) for _ in range(length))
    return password

print("Generating 3 secure passwords:")
for i in range(3):
    print(f"Password {i+1}: {generate_password(16)}")

Terminal Output

Generating 3 secure passwords:
Password 1: a!7T#nP@zQ8k*L1w
Password 2: xY9^vB4$mC2&pR5j
Password 3: dF3%hK6*tW9@nM1q
(Output will be random during real execution)

Real-world Applications

Automated user credential assignment
Generating mock data for penetration testing suites
System admin utility scripts for server deployment

Frequently Asked Questions

Is the `random` module safe for real passwords?

The `random` module is pseudo-random. For generating actual secure passwords in production, you should use Python’s `secrets` module which utilizes OS-level secure entropy.

More Examples

Python Simple Calculator Script

Build a basic calculator in Python. Learn how to map mathematical operators, take user execution flows, and handle logic natively.

Python Number Guessing Game

A classic beginner Python project. Build an interactive number guessing game that uses random generation, while loops, and user input validation.