core.py

Author: Pablo Galindo and ukasz Langa

We talk about Python internals, because we work on Python internals. We joke about stuff, because were jokers. Episodes between 60 and 90 minutes in length. Weve done more than a few so far and it doesnt seem like well be stopping any time soon! Hi Loren!
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Language: en

Genres: News, Tech News

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The Megahertz
Episode 24
Saturday, 12 July, 2025

Python 3.14? That's old news. Let's talk about the first big feature of Python 3.15 -- a built-in sampling profiler for Linux, macOS, and Windows. We also cover improvements in perf support, discuss memory.python.org, and as usual, recent changes in the codebase.## Timestamps(00:00:00) INTRO(00:02:43) PART 1: THE SAMPLING PROFILER(00:05:07) Built-in profile is bad, long live cProfile(00:10:54) Out-of-process profiling(00:12:18) Shortcuts Compromise Accuracy, Leading Eventually to Numerous Errors(00:16:07) Selfish Łukasz vs benevolent Pablo(00:23:11) How does a sampling profiler even work?(00:30:42) One meeellion huuurtzzz(00:32:40) Free threading makes it extra spicy(00:41:26) AsyncIO makes it even spicier(00:49:49) You made this? I made this(00:54:06) What if the profiled process changes during sampling?(00:57:33) Coming in October 2026(01:04:30) PART 2: PR OF THE WEEEEEEK(01:14:14) memory.python.org launched(01:23:15) PART 3: WHAT'S GOING ON IN CPYTHON(01:26:45) Performance updates(01:30:24) Features & Curiosities(01:41:45) OUTRO