Code size report:

   bare-arm:    +0 +0.000% 
minimal x86:    +0 +0.000% 
   unix x64:  +336 +0.042% standard[incl +32(data)]
      stm32:  +148 +0.038% PYBV10
        rp2:  +176 +0.054% PICO

Codecov Report

Merging #11244 (d872e6e) into master (bde222c) will decrease coverage by 0.06%.
The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##           master   #11244      +/-   ##
==========================================
- Coverage   98.50%   98.44%   -0.06%     
==========================================
  Files         155      155              
  Lines       20549    20561      +12     
==========================================
  Hits        20241    20241              
- Misses        308      320      +12     

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First thing to ask is how would one do this in CPython?

Then we need to consider if it's worth the cost (code size) and whether it should be guarded by a config macro. I would say yes it should be, but then at what level would it be enabled, eg MICROPY_CONFIG_ROM_LEVEL_EXTRA_FEATURES.

You can get this info in CPython is like this:

import traceback

def foo():
    1/0

try:
    foo()
except Exception as e:
    tb = e.__traceback__
    while tb is not None:
        print("====")
        print("  filename: " + str(tb.tb_frame.f_code.co_filename))
        print("  line: " + str(tb.tb_lineno))
        print("  name: " + str(tb.tb_frame.f_code.co_name))
        tb = tb.tb_next

This involves at least three different classes: traceback, frame, and code. The latter two contain quite a few things:

dir(tb): ['tb_frame', 'tb_lasti', 'tb_lineno', 'tb_next']
dir(frame): ['__class__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'clear', 'f_back', 'f_builtins', 'f_code', 'f_globals', 'f_lasti', 'f_lineno', 'f_locals', 'f_trace', 'f_trace_lines', 'f_trace_opcodes']
dir(code): ['__class__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'co_argcount', 'co_cellvars', 'co_code', 'co_consts', 'co_filename', 'co_firstlineno', 'co_flags', 'co_freevars', 'co_kwonlyargcount', 'co_lines', 'co_linetable', 'co_lnotab', 'co_name', 'co_names', 'co_nlocals', 'co_posonlyargcount', 'co_stacksize', 'co_varnames', 'replace']

The Python standard library also comes with a traceback module that introduces more classes. MicroPython implements a minimal traceback module.

CPython does not have sys.print_exception like MicroPython does.

I changed it so that this function is only enabled by default if MICROPY_CONFIG_ROM_LEVEL_EXTRA_FEATURES is 1. (I'm glad to see this provides it for the RP2 boards.) I also added documentation.

This is an automated heads-up that we've just merged a Pull Request
that removes the STATIC macro from MicroPython's C API.

See #13763

A search suggests this PR might apply the STATIC macro to some C code. If it
does, then next time you rebase the PR (or merge from master) then you should
please replace all the STATIC keywords with static.

Although this is an automated message, feel free to @-reply to me directly if
you have any questions about this.