Seapie – a Python debugger where breakpoints drop into a REPL
Author here. I started seapie as a reaction to pdb's command-driven interface in 2019. I wanted a breakpoint to simply mean 'open a Python REPL here', with debugging functionality layered on top instead of replacing the REPL. `seapie.breakpoint()` opens a working `>>>` REPL at the current execution state. Any changes to variables or function definitions persist. Debugger state is exposed via built-ins (e.g. `_magic_`), and stepping/frame control/etc is handled via small `!commands`. I've been using this regularly in my own work for a few years now. Happy to answer questions or hear…
In plain words
Seapie is a Python debugger that opens a standard Python REPL when a breakpoint is triggered, rather than switching to a command-driven interface. It allows developers to inspect and modify variables and define functions directly at the breakpoint, with debugging commands available through small text commands. Built-in objects expose debugger state, and stepping and frame control are handled via these optional commands. It's designed for Python developers who prefer working in an interactive shell while debugging.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Author here. I started seapie as a reaction to pdb's command-driven interface in 2019. I wanted a breakpoint to simply mean 'open a Python REPL here', with debugging functionality layered on top instead of replacing the REPL. `seapie.breakpoint()` opens a working `>>>` REPL at the current execution state. Any changes to variables or function definitions persist. Debugger state is exposed via built-ins (e.g. `_magic_`), and stepping/frame control/etc is handled via small `!commands`. I've been using this regularly in my own work for a few years now. Happy to answer questions or hear criticism, especially from people who've used debuggers heavily.
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