Reference library

Modern tooling

uv, ruff, pyproject.toml, packaging, and current Python project workflows.

1 match
Modern tooling easy

How to Generate a Mock Rollbar Error Report in Python

Create a realistic fake Rollbar error report with random timestamps, levels, messages, and counts for testing and demos.

rollbar mock-data error-reporting
Python 
import json
import random
import time
from datetime import datetime, timedelta


def mock_rollbar_report(n_errors=5):
    messages = [
        "TypeError: unsupported operand type(s) for +: 'int' and 'str'",
        "KeyError: 'user_id'",
        "ValueError: invalid literal for int() with base 10: 'abc'",
        "At…
13 0 Open

Browse by section

Each section groups closely related Python snippets.

Modern tooling — Python code examples

What you will find here

This page collects modern tooling snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.

Samples vs tutorials and challenges

Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.

Related coding tools

Free online Python IDE Write and run Python in your browser — no install. Free Python code formatter Format with autopep8 — side-by-side PEP 8 cleanup. Python code samples Copy-ready snippets to study and run in the IDE.