Episode 20: Remote Code Execution By Design
Episode 20 of the core.py podcast, hosted by Pablo Galindo and Łukasz Langa, titled "Episode 20: Remote Code Execution By Design " was published on March 24, 2025 and runs 104 minutes.
March 24, 2025 ·104m · core.py
Summary
In this episode, Pablo's avoiding the topic of garbage collection by talking about his latest PEP, which allows unprecedented interaction with a running Python process. We also resolve the bet about reference counting semantics, mention some notable changes in Python since the last episode, and discuss syntax highlighting in PyREPL and why it's bad, actually.## Timestamps(00:00:00) INTRO(00:02:16) PART 1: PABLO'S LATEST PEP(00:04:34) gdb is IMPOSSIBLE(00:12:49) Make the process run code for you(00:14:14) This already works on PyPy(00:15:13) How does it work?(00:25:38) Why a file?(00:31:15) What if you don't trust Pablo?(00:32:57) sys.remote_exec()(00:36:09) Less obvious use cases(00:46:56) PART 2: BETS(00:55:44) PART 3: PR OF THE WEEK(00:55:50) Łukasz: syntax highlighting in PyREPL(01:10:14) Pablo's PR: allow the parser to activate future imports on the fly(01:20:11) PART 4: WHAT'S GOING ON IN CPYTHON(01:20:22) Free threading(01:23:30) Performance(01:34:41) PEP 765 implemented(01:36:08) concurrent.futures.Executor.map(buffersize=)(01:36:57) io.Reader and io.Writer(01:38:40) Pabluco's linecache fetching interactive source code(01:41:25) ast.unparse() roundtrip with semicolons(01:41:59) OUTRO
Episode Description
In this episode, Pablo's avoiding the topic of garbage collection by talking about his latest PEP, which allows unprecedented interaction with a running Python process. We also resolve the bet about reference counting semantics, mention some notable changes in Python since the last episode, and discuss syntax highlighting in PyREPL and why it's bad, actually.
## Timestamps
(00:00:00) INTRO
(00:02:16) PART 1: PABLO'S LATEST PEP
(00:04:34) gdb is IMPOSSIBLE
(00:12:49) Make the process run code for you
(00:14:14) This already works on PyPy
(00:15:13) How does it work?
(00:25:38) Why a file?
(00:31:15) What if you don't trust Pablo?
(00:32:57) sys.remote_exec()
(00:36:09) Less obvious use cases
(00:46:56) PART 2: BETS
(00:55:44) PART 3: PR OF THE WEEK
(00:55:50) Łukasz: syntax highlighting in PyREPL
(01:10:14) Pablo's PR: allow the parser to activate future imports on the fly
(01:20:11) PART 4: WHAT'S GOING ON IN CPYTHON
(01:20:22) Free threading
(01:23:30) Performance
(01:34:41) PEP 765 implemented
(01:36:08) concurrent.futures.Executor.map(buffersize=)
(01:36:57) io.Reader and io.Writer
(01:38:40) Pabluco's linecache fetching interactive source code
(01:41:25) ast.unparse() roundtrip with semicolons
(01:41:59) OUTRO
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