Rémi Lapeyre <remi.lape...@henki.fr> added the comment:

Yes, the patch by Terry Reedy fixes this issue while still breaking the loop 
from `def f: pass`.

It will start the debugger once for `def f: pass` which may be weird as in this 
case no user code has been executed and it will be in bdb which may confuse 
users:


Traceback (most recent call last):
  File "/Users/remi/src/cpython/Lib/pdb.py", line 1703, in main
    pdb._runscript(mainpyfile)
  File "/Users/remi/src/cpython/Lib/pdb.py", line 1572, in _runscript
    self.run(statement)
  File "/Users/remi/src/cpython/Lib/bdb.py", line 580, in run
    exec(cmd, globals, locals)
  File "<string>", line 1, in <module>
  File "/Users/remi/src/cpython/tests.py", line 1
    def f: pass
         ^
SyntaxError: invalid syntax
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> <string>(1)<module>()
(Pdb) bt
  /Users/remi/src/cpython/Lib/pdb.py(1703)main()
-> pdb._runscript(mainpyfile)
  /Users/remi/src/cpython/Lib/pdb.py(1572)_runscript()
-> self.run(statement)
  /Users/remi/src/cpython/Lib/bdb.py(580)run()
-> exec(cmd, globals, locals)
> <string>(1)<module>()


Perhaps we should should test whether the exception happened there and not drop 
in the debugger in that case?

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<https://bugs.python.org/issue40403>
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