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gh-156774: Speed up pdb startup with asyncio guard #156775

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gh-156774: Speed up pdb startup with asyncio guard #156775

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3c199f4
gh-999998: Speed up pdb startup with lazy imports
brittanyrey Sep 1, 2026
8d15fb1
gh-156774: Point pdb lazy-import NEWS entry at the filed issue
brittanyrey Sep 1, 2026
89fccc3
gh-156774: Scope pdb change down to the asyncio import only
brittanyrey Sep 1, 2026
5ad79b2
Address comments
brittanyrey Sep 2, 2026
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7 changes: 6 additions & 1 deletion Lib/pdb.py
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Original file line number Diff line number Diff line change
Expand Up @@ -84,7 +84,6 @@
import signal
import socket
import typing
import asyncio
import inspect
import weakref
import builtins
Expand All @@ -102,6 +101,8 @@
from types import CodeType
from warnings import deprecated

lazy import asyncio

try:
import _pyrepl.utils
except ModuleNotFoundError:
Expand Down Expand Up @@ -902,6 +903,10 @@ def _hold_exceptions(self, exceptions):
self._chained_exception_index = 0

def _get_asyncio_task(self):
# If asyncio has never been imported there cannot be a running task,
# so skip the import rather than pay for it on every interaction.
if 'asyncio' not in sys.modules:
return None
try:
task = asyncio.current_task()
except RuntimeError:
Expand Down
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2026-08-31-11-40-00.gh-issue-156774.Pd8Lz1.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Speed up :mod:`pdb` startup by only importing :mod:`asyncio` when the program
being debugged has already imported it.
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