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Episode 27: Calling Things, Part 1 episode artwork

EPISODE · Dec 7, 2025 · 2H 5M

Episode 27: Calling Things, Part 1

from core.py · host Pablo Galindo and Łukasz Langa

Inside of you there are two stacks. Actually, there’s three. The system-level call stack, the CPython call stack, and the interpreter’s evaluation stack. What is all that about? Today we’ll talk about how synchronous Python function calls work. Async stuff comes next time!## TimestampsHere you go — all square brackets changed to parentheses:(00:00:00) INTRO(00:02:28) PART 1: CALLING THINGS(00:04:19) The Lawful Good Language(00:13:18) Why is there a call stack?(00:19:45) Python functions are not tied to the system call stack(00:23:22) What's in a Python frame?(00:23:35) Execution book-keeping data(00:24:21) Locals(00:27:35) The interpreter evaluation stack(00:28:34) What are register-based interpreters?(00:36:33) Interpretation using the evaluation stack(00:42:46) Executing a function(00:45:37) How do exceptions fit into the execution model?(01:05:51) PART 2: PR OF THE WEEK(01:15:48) PART 3: DONATE.PYTHON.ORG(01:17:21) PART 4: WHAT'S GOING ON IN CPYTHON(01:27:59) Free threading changes(01:38:16) Performance(01:51:08) Bugfixes(02:04:03) OUTRO

What this episode covers

Inside of you there are two stacks. Actually, there’s three. The system-level call stack, the CPython call stack, and the interpreter’s evaluation stack. What is all that about? Today we’ll talk about how synchronous Python function calls work. Async stuff comes next time!## TimestampsHere you go — all square brackets changed to parentheses:(00:00:00) INTRO(00:02:28) PART 1: CALLING THINGS(00:04:19) The Lawful Good Language(00:13:18) Why is there a call stack?(00:19:45) Python functions are not tied to the system call stack(00:23:22) What's in a Python frame?(00:23:35) Execution book-keeping data(00:24:21) Locals(00:27:35) The interpreter evaluation stack(00:28:34) What are register-based interpreters?(00:36:33) Interpretation using the evaluation stack(00:42:46) Executing a function(00:45:37) How do exceptions fit into the execution model?(01:05:51) PART 2: PR OF THE WEEK(01:15:48) PART 3: DONATE.PYTHON.ORG(01:17:21) PART 4: WHAT'S GOING ON IN CPYTHON(01:27:59) Free threading changes(01:38:16) Performance(01:51:08) Bugfixes(02:04:03) OUTRO

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This episode is 2 hours and 5 minutes long.

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This episode was published on December 7, 2025.

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Inside of you there are two stacks. Actually, there’s three. The system-level call stack, the CPython call stack, and the interpreter’s evaluation stack. What is all that about? Today we’ll talk about how synchronous Python function calls work....

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