Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When reading a CSV or text file with pandas.read_csv(), you might encounter a ...

Fix VSCode Terminal Not Opening with Python
You try to run a Python script in VSCode, click the terminal tab, and nothing happens—or the term...

Fix VS Code Terminal Not Working After Update
After a VS Code update, the integrated terminal may fail to start, show a blank window, or displa...

Python Requests Timeout Not Working: Fixes & Checks
You set a timeout in requests.get(url, timeout=5), but the request hangs for minutes...

Fix Nginx Upstream Connection Refused Socket Error
When Nginx returns a 502 Bad Gateway or logs upstream connection refused

Python Virtual Environment Not Activating on Ubuntu: Fixes
You've created a Python virtual environment on Ubuntu, but when you run source venv/bin...