Happy New Year! In this episode we're talking about exceptions, how they work, and how they evolved. Expect the unexpected.

# Timestamps

(00:00:00 )  INTRO

(00:01:43 )  How does a 'try' block work?

(00:04:00 )  How many 'try' blocks can you fit on a bus?

(00:05:56 )  How does Python store the current exception?

(00:09:30 )  Pre-history: exceptions as strings

(00:12:59 )  Try out string exceptions with CentOS 5

(00:14:28 )  PEP 341: Combining 'finally' and 'except' in one 'try' block

(00:16:15 )  Core Hacker in Residence

(00:16:51 )  PEP 3109: Raising exceptions in Python 3K

(00:19:17 )  Automatic tuple unpacking for raised exceptions?!

(00:21:55 )  PEP 3110: Catching exceptions in Python 3K

(00:26:00 )  Foreshadowing: exception groups

(00:27:10 )  PEP 3134: Exception chaining

(00:29:12 )  __cause__, __context__, __traceback__

(00:31:50 )  Back in the day we had to walk uphill both ways

(00:32:56 )  PEP 409: Suppressing exception chaining

(00:34:44 )  Raise from None? Or raise from Ellipsis?

(00:37:11 )  __supress_context__

(00:38:13 )  Semantic difference between 'pass', 'None', and '....'

(00:41:02 )  NotImplemented vs NotImplementedError

(00:43:02 )  Zero-cost exceptions in Python 3.11

(00:51:12 )  Reconstructing exception table entries dynamically

(00:52:51 )  Objects/exception_handling_notes.txt

(00:54:19 )  PEP 654: Historical context

(00:56:58 )  PEP 654: BaseExceptionGroup and ExceptionGroup

(00:58:29 )  PEP 654: except*

(01:03:23 )  PEP 678: Exception notes

(01:06:09 )  PEP 657: Cooler Errors

(01:08:36 )  A message to language implementers

(01:09:15 )  Fine-grained error locations in tracebacks

(01:12:05 )  This is useful for tracing coverage and Specializator

(01:13:50 )  Hacker in Residence fired?

(01:16:25 )  WHAT'S GOING ON IN CPYTHON

(01:16:58 )  Copy&patch JIT PR open

(01:21:30 )  Free-threading progress: GC split, stop-the-world

(01:24:22 )  The buildbots are red

(01:25:27 )  Faster CPython changes: interpreter code generator refactors

(01:26:27 )  Eval Game crash fix

(01:28:41 )  Three developers in residence!

(01:29:54 )  OUTRO

# Links

https://compilercrim.es/rust-np/