remote pdb can not attach when breakpoint() and exit

Bug report

Bug description:

reproduce

on terminal

./python.exe
breakpoint()
# ctrl + D

another terminal

sudo ./python.exe -m pdb -p $(pid)

more can check png below

debug:

Pdb._last_pdb_instance still when do_quit in repl so remote pdb can not exec in it

fix:

diff --git a/Lib/pdb.py b/Lib/pdb.py
index f695a39332..3e32c50f96 100644
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -2008,6 +2008,7 @@ def do_quit(self, arg):
                     return
 
         self._user_requested_quit = True
+        Pdb._last_pdb_instance = None
         self.set_quit()
         return 1
 

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS

Linked PRs

• gh-139690

从 Lib/pdb.py 中的 Pdb.do_quit 开始，在检查提议的更改之前，先复现 issue 中的 breakpoint() 和 exit 序列。验证退出本地调试器后是否允许稍后进行 remote pdb attach，并检查链接的 PR gh-139690，了解已经在进行的工作。