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python -m pdb error.py: stuck in unexitable infinite prompt loop #69145

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shlomif mannequin opened this issue Aug 29, 2015 · 3 comments
Closed

python -m pdb error.py: stuck in unexitable infinite prompt loop #69145

shlomif mannequin opened this issue Aug 29, 2015 · 3 comments
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stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error

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@shlomif
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shlomif mannequin commented Aug 29, 2015

BPO 24957
Nosy @birkenfeld, @terryjreedy, @shlomif
Superseder
  • bpo-16180: cannot quit pdb when there is a syntax error in the debuggee (must kill it)
    		•
    Files
  • euler-234-v1.py
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
closed_at = <Date 2015-09-04.17:50:44.173>
created_at = <Date 2015-08-29.15:44:54.395>
labels = ['type-bug', 'library']
title = 'python -m pdb error.py:  stuck in unexitable infinite prompt loop'
updated_at = <Date 2015-09-04.17:50:44.172>
user = 'https://github.com/shlomif'

    bugs.python.org fields:

    activity = <Date 2015-09-04.17:50:44.172>
actor = 'terry.reedy'
assignee = 'none'
closed = True
closed_date = <Date 2015-09-04.17:50:44.173>
closer = 'terry.reedy'
components = ['Library (Lib)']
creation = <Date 2015-08-29.15:44:54.395>
creator = 'shlomif'
dependencies = []
files = ['40292']
hgrepos = []
issue_num = 24957
keywords = []
message_count = 3.0
messages = ['249319', '249320', '249794']
nosy_count = 3.0
nosy_names = ['georg.brandl', 'terry.reedy', 'shlomif']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '16180'
type = 'behavior'
url = 'https://bugs.python.org/issue24957'
versions = ['Python 2.7', 'Python 3.4', 'Python 3.5', 'Python 3.6']
    @shlomif
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    shlomif mannequin commented Aug 29, 2015

    I tried Ctrl+C, Ctrl+D, "quit" and "exit", and "q" - nothing exits from the infinite prompt loop.

    shlomif@telaviv1:~/Docs/homepage/homepage/trunk$ cd /home/shlomif/progs/riddles/project-euler/hg/project-euler/234
shlomif@telaviv1:~/progs/riddles/project-euler/hg/project-euler/234$ ls
brute-force.pl   euler-234-description.txt   euler-234-v1.py
brute-force.pl~  euler-234-description.txt~  euler-234-v1.py~
shlomif@telaviv1:~/progs/riddles/project-euler/hg/project-euler/234$ python3 euler-234-v1.py 
  File "euler-234-v1.py", line 21
    print "Found[] = ", n
                     ^
SyntaxError: Missing parentheses in call to 'print'
shlomif@telaviv1:~/progs/riddles/project-euler/hg/project-euler/234$ python3 -mpdb euler-234-v1.py 1000
Traceback (most recent call last):
  File "/usr/lib64/python3.4/pdb.py", line 1661, in main
    pdb._runscript(mainpyfile)
  File "/usr/lib64/python3.4/pdb.py", line 1542, in _runscript
    self.run(statement)
  File "/usr/lib64/python3.4/bdb.py", line 431, in run
    exec(cmd, globals, locals)
  File "<string>", line 1, in <module>
  File "/home/shlomif/progs/riddles/project-euler/hg/project-euler/234/euler-234-v1.py", line 21
    print "Found[] = ", n
                     ^
SyntaxError: Missing parentheses in call to 'print'
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> <string>(1)<module>()
(Pdb) 
(Pdb) exit
Post mortem debugger finished. The euler-234-v1.py will be restarted
Traceback (most recent call last):
  File "/usr/lib64/python3.4/pdb.py", line 1661, in main
    pdb._runscript(mainpyfile)
  File "/usr/lib64/python3.4/pdb.py", line 1542, in _runscript
    self.run(statement)
  File "/usr/lib64/python3.4/bdb.py", line 431, in run
    exec(cmd, globals, locals)
  File "<string>", line 1, in <module>
  File "/home/shlomif/progs/riddles/project-euler/hg/project-euler/234/euler-234-v1.py", line 21                                                                
    print "Found[] = ", n                                                       
                     ^                                                          
SyntaxError: Missing parentheses in call to 'print'                             
Uncaught exception. Entering post mortem debugging                              
Running 'cont' or 'step' will restart the program                               
> <string>(1)<module>()                                                         
(Pdb) quit                                                                      
Post mortem debugger finished. The euler-234-v1.py will be restarted            
Traceback (most recent call last):                                              
  File "/usr/lib64/python3.4/pdb.py", line 1661, in main                        
    pdb._runscript(mainpyfile)                                                  
  File "/usr/lib64/python3.4/pdb.py", line 1542, in _runscript                  
    self.run(statement)                                                         
  File "/usr/lib64/python3.4/bdb.py", line 431, in run                          
    exec(cmd, globals, locals)                                                  
  File "<string>", line 1, in <module>                                          
  File "/home/shlomif/progs/riddles/project-euler/hg/project-euler/234/euler-234-v1.py", line 21
    print "Found[] = ", n
                     ^
SyntaxError: Missing parentheses in call to 'print'
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> <string>(1)<module>()
(Pdb) 
Post mortem debugger finished. The euler-234-v1.py will be restarted
Traceback (most recent call last):
  File "/usr/lib64/python3.4/pdb.py", line 1661, in main
    pdb._runscript(mainpyfile)
  File "/usr/lib64/python3.4/pdb.py", line 1542, in _runscript
    self.run(statement)
  File "/usr/lib64/python3.4/bdb.py", line 431, in run
    exec(cmd, globals, locals)
  File "<string>", line 1, in <module>
  File "/home/shlomif/progs/riddles/project-euler/hg/project-euler/234/euler-234-v1.py", line 21
    print "Found[] = ", n
                     ^
SyntaxError: Missing parentheses in call to 'print'
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> <string>(1)<module>()
(Pdb) --KeyboardInterrupt--
(Pdb) --KeyboardInterrupt--
(Pdb) exit
Post mortem debugger finished. The euler-234-v1.py will be restarted
Traceback (most recent call last):
  File "/usr/lib64/python3.4/pdb.py", line 1661, in main
    pdb._runscript(mainpyfile)
  File "/usr/lib64/python3.4/pdb.py", line 1542, in _runscript
    self.run(statement)
  File "/usr/lib64/python3.4/bdb.py", line 431, in run
    exec(cmd, globals, locals)
  File "<string>", line 1, in <module>
  File "/home/shlomif/progs/riddles/project-euler/hg/project-euler/234/euler-234-v1.py", line 21
    print "Found[] = ", n
                     ^
SyntaxError: Missing parentheses in call to 'print'
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> <string>(1)<module>()
(Pdb) quit
Post mortem debugger finished. The euler-234-v1.py will be restarted
Traceback (most recent call last):
  File "/usr/lib64/python3.4/pdb.py", line 1661, in main
    pdb._runscript(mainpyfile)
  File "/usr/lib64/python3.4/pdb.py", line 1542, in _runscript
    self.run(statement)
  File "/usr/lib64/python3.4/bdb.py", line 431, in run
    exec(cmd, globals, locals)
  File "<string>", line 1, in <module>
  File "/home/shlomif/progs/riddles/project-euler/hg/project-euler/234/euler-234-v1.py", line 21
    print "Found[] = ", n
                     ^
SyntaxError: Missing parentheses in call to 'print'
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> <string>(1)<module>()
(Pdb) 
[1]+  Stopped                 python3 -mpdb euler-234-v1.py 1000
shlomif@telaviv1:~/progs/riddles/project-euler/hg/project-euler/234$ kill %1

    [1]+ Stopped python3 -mpdb euler-234-v1.py 1000
    shlomif@telaviv1:/progs/riddles/project-euler/hg/project-euler/234$
    [1]+ Terminated python3 -mpdb euler-234-v1.py 1000
    shlomif@telaviv1:    /progs/riddles/project-euler/hg/project-euler/234$
    shlomif@telaviv1:/progs/riddles/project-euler/hg/project-euler/234$
    shlomif@telaviv1:    /progs/riddles/project-euler/hg/project-euler/234$ jobs
    shlomif@telaviv1:~/progs/riddles/project-euler/hg/project-euler/234$

    @shlomif shlomif mannequin added the stdlib Python modules in the Lib dir label Aug 29, 2015
    @shlomif
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    shlomif mannequin commented Aug 29, 2015

    I should note that I am using python3-3.4.3-6.mga6 on Mageia Linux x86-64 6/Cauldron.

    @terryjreedy
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    Pdb says "Running 'cont' or 'step' will restart the program" but it seems to restart on any recognized command other than 'h' and traps everything else. I verified behavior on Win7 with ordinary syntax error 'a = = 1' on installed 2.7.10 and 3.4.3. Removed qualifiers from title.

    Doc says
    '''
    python3 -m pdb myscript.py

    When invoked as a script, pdb will automatically enter post-mortem debugging if the program being debugged exits abnormally. After post-mortem debugging (or after normal exit of the program), pdb will restart the program.'''

    But not being able to exit could not have been the intention. Looking at the code.

    @terryjreedy terryjreedy changed the title python3 -mpdb gets stuck in an unexitable infinite prompt loop when running some Python 2 code with syntax errors python -m pdb error.py: stuck in unexitable infinite prompt loop Sep 4, 2015
    @terryjreedy terryjreedy added the type-bug An unexpected behavior, bug, or error label Sep 4, 2015
    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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