cool-RR/PySnooper

Health v2 · maintenance only

Adoption not part of the score

16582 stars · 961 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

PySnooper is a Python library that provides line-by-line execution tracing of functions via a simple decorator or context manager, logging which lines ran and how local variables changed. It acts as a lightweight alternative to full debuggers, replacing ad-hoc print statements with detailed execution logs.

Use cases

• debug python code without setting up a debugger
• replace print statement debugging with a decorator
• trace which lines of a function execute and when
• log local variable changes during function execution
• redirect execution trace output to a log file
• snoop on a specific block of code with a context manager
• watch values of expressions during debugging

When to choose

• you want quick debugging with zero setup in a large codebase
• a full debugger with breakpoints feels like overkill
• you need a play-by-play log of function execution and variable changes

When to avoid

• you need breakpoints, stepping, or interactive debugging
• tracing would produce excessive overhead in performance-critical code
• you need multi-threaded or distributed debugging features

Facets

library · maturity active

logging developer-tools developer-tools python cross-platform debugging tracing decorator poor-mans-debugger introspection python

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