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/