Optimize pdb with asyncio gating · Issue #156774 · python/cpython · GitHub

import pdb costs ~84 ms. The largest single contributor is asyncio at ~36 ms — imported for
exactly one call site.

Only import asyncio in pdb, if asyncio is actually being used by the program being debugged.

NOTE: initially this issue also included lazy imports optimizations, until @hugovk let me know that there was already a PR open to address that.

(PR is prepared)

pythongh-156774: Point pdb lazy-import NEWS entry at the filed issue

pythongh-156774: Scope pdb change down to the asyncio import only

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

Merge branch 'main' into tachyon-native-callable

pythongh-156774: Speed up pdb startup with asyncio guard (python#156775)

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