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Python: Remove workerd runtime frames from the top of stack trace #5542

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Python: Remove workerd runtime frames from the top of stack trace #5542

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18 changes: 18 additions & 0 deletions src/pyodide/internal/introspection.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,6 @@
import sys
from inspect import isawaitable, isclass
from traceback import TracebackException
from types import FunctionType

import js
Expand Down Expand Up @@ -86,3 +88,19 @@ async def wrapper_func(relaxed, inst, prop, *args, **kwargs):
return python_to_rpc(await result)
else:
return python_to_rpc(result)


def excepthook(_type, exc, _tb):
"""Remove workerd runtime frames from the top of the stack trace."""
tb_exc = TracebackException.from_exception(exc)
for idx, frame in enumerate(tb_exc.stack):
fn = frame.filename
# Remove frames from "introspection.py" and "/lib/python".
if fn.startswith("/") and not fn.startswith("/lib/python"):
first_user_frame = idx
break
del tb_exc.stack[:first_user_frame]
tb_exc.print()


sys.excepthook = excepthook
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