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Set sys.last_value / sys.last_exc before entering the debugger #380

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Nov 29, 2024
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Set sys.last_value / sys.last_exc before entering the debugger #380

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8 changes: 8 additions & 0 deletions lib/python/pyflyby/_dbg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -316,6 +316,14 @@ def _debug_exception(*exc_info, **kwargs):
# will cause print_verbose_tb to include a line with just a colon.
# TODO: avoid that line.
exc_info = ("", "", exc_info)
if exc_info[1]:
# Explicitly set sys.last_value / sys.last_exc to ensure they are available
# in the debugger. One use case is that this allows users to call
# pyflyby.saveframe() within the debugger.
if sys.version_info < (3, 12):
sys.last_value = exc_info[1]
else:
sys.last_exc = exc_info[1]

with _DebuggerCtx(tty=tty) as pdb:
if debugger_attached:
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