Python Debugger (pdb + debugpy)

Overview

Three tools, picked by situation:

Tool	When
`breakpoint()` + pdb	Local, interactive, simplest. Add `breakpoint()` in the source, run normally, get a REPL at that line.
`python -m pdb`	Launch an existing script under pdb with no source edits. Useful for quick poking.
`debugpy`	Remote / headless / "attach to already-running process." Talks DAP, scriptable from terminal, works for long-lived processes (gateway, daemon, PTY children).

Start with breakpoint(). It's the cheapest thing that works.

Installs

233

Repository

GitHub Stars

220.5K

First Seen

Apr 27, 2026

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