Debug script under pdb, how to avoid a bunch of errors caused by the exit()?

Thu Sep 6 05:38:13 EDT 2018

 Here the script file, test0.py:
--------------------------
password = 'bad'
if password == 'bad':
 print('bad password')
 exit()
else:
 print('good password')
print('something else to do')
--------------------
 When running it under Python3.4 Windows Vista, no problem at all.
D:\Works\Python>py test0.py
bad password
 But if debug it under pdb:
D:\Works\Python>py -m pdb test0.py
 > d:\works\python\test0.py(1)<module>()
-> password = 'bad'
(Pdb) tbreak 3
Breakpoint 1 at d:\works\python\test0.py:3
(Pdb) cont
Deleted breakpoint 1 at d:\works\python\test0.py:3
 > d:\works\python\test0.py(3)<module>()
-> print('bad password')
(Pdb) cont
bad password
The program exited via sys.exit(). Exit status: None
 > d:\works\python\test0.py(1)<module>()
-> password = 'bad'
(Pdb) Traceback (most recent call last):
 File "C:\Python34\lib\pdb.py", line 1661, in main
 pdb._runscript(mainpyfile)
 File "C:\Python34\lib\pdb.py", line 1542, in _runscript
 self.run(statement)
 File "C:\Python34\lib\bdb.py", line 431, in run
 exec(cmd, globals, locals)
 File "<string>", line 1, in <module>
 File "d:\works\python\test0.py", line 1, in <module>
 password = 'bad'
 File "d:\works\python\test0.py", line 1, in <module>
 password = 'bad'
 File "C:\Python34\lib\bdb.py", line 48, in trace_dispatch
 return self.dispatch_line(frame)
 File "C:\Python34\lib\bdb.py", line 66, in dispatch_line
 self.user_line(frame)
 File "C:\Python34\lib\pdb.py", line 259, in user_line
 self.interaction(frame, None)
 File "C:\Python34\lib\pdb.py", line 346, in interaction
 self._cmdloop()
 File "C:\Python34\lib\pdb.py", line 319, in _cmdloop
 self.cmdloop()
 File "C:\Python34\lib\cmd.py", line 126, in cmdloop
 line = input(self.prompt)
ValueError: I/O operation on closed file.
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
 > c:\python34\lib\cmd.py(126)cmdloop()
-> line = input(self.prompt)
(Pdb) Traceback (most recent call last):
 File "C:\Python34\lib\pdb.py", line 1661, in main
 pdb._runscript(mainpyfile)
 File "C:\Python34\lib\pdb.py", line 1542, in _runscript
 self.run(statement)
 File "C:\Python34\lib\bdb.py", line 431, in run
 exec(cmd, globals, locals)
 File "<string>", line 1, in <module>
 File "d:\works\python\test0.py", line 1, in <module>
 password = 'bad'
 File "d:\works\python\test0.py", line 1, in <module>
 password = 'bad'
 File "C:\Python34\lib\bdb.py", line 48, in trace_dispatch
 return self.dispatch_line(frame)
 File "C:\Python34\lib\bdb.py", line 66, in dispatch_line
 self.user_line(frame)
 File "C:\Python34\lib\pdb.py", line 259, in user_line
 self.interaction(frame, None)
 File "C:\Python34\lib\pdb.py", line 346, in interaction
 self._cmdloop()
 File "C:\Python34\lib\pdb.py", line 319, in _cmdloop
 self.cmdloop()
 File "C:\Python34\lib\cmd.py", line 126, in cmdloop
 line = input(self.prompt)
ValueError: I/O operation on closed file.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "C:\Python34\lib\runpy.py", line 170, in _run_module_as_main
 "__main__", mod_spec)
 File "C:\Python34\lib\runpy.py", line 85, in _run_code
 exec(code, run_globals)
 File "C:\Python34\lib\pdb.py", line 1688, in <module>
 pdb.main()
 File "C:\Python34\lib\pdb.py", line 1680, in main
 pdb.interaction(None, t)
 File "C:\Python34\lib\pdb.py", line 346, in interaction
 self._cmdloop()
 File "C:\Python34\lib\pdb.py", line 319, in _cmdloop
 self.cmdloop()
 File "C:\Python34\lib\cmd.py", line 126, in cmdloop
 line = input(self.prompt)
ValueError: I/O operation on closed file.
D:\Works\Python>
 How to get rid of these?
Best Regards,
Jach Fong
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