Va debugger ton Python!

Cette presentation vous explique les bases de Pdb ainsi que GDB, afin de debugger plus facilement vos scripts Python.

Transcript

1. Va debugger ton par Stéphane Wirtel PyCon FR 2017 - Toulouse - 23/09/2017 1 / 107
2. Salut, je suis Stéphane par ma fille 1 / 107
3. Qui aime developper... ? 2 / 107
4. Debugger c'est Hard! 3 / 107
5. Que fait ce code ? # Example 1 def main(): for i in range(1, 4): i /= 4 if i == 4: print('Salut PyConFR 2017') if __name__ == '__main__': main() 4 / 107
6. Que fait ce code ? # Example 1 def main(): for i in range(1, 4): i /= 4 if i == 4: print('Salut PyConFR 2017') if __name__ == '__main__': main() $ python example1.py $ 5 / 107
7. La sacro-sainte fonction print() 6 / 107
8. La sacro-sainte fonction print() # Example 2 def main(): for i in range(1, 4): i /= 4 print(i) if i == 4: print('Salut PyConFR 2017') 7 / 107
9. La sacro-sainte fonction print() # Example 2 def main(): for i in range(1, 4): i /= 4 print(i) if i == 4: print('Salut PyConFR 2017') $ python example2.py 0 0 0 $ 8 / 107
10. Le module logging 9 / 107
11. Utilisons logging # Example 3 import logging def main(): logging.basicConfig(level=logging.INFO) logging.info('start program') logging.debug("before loop") for i in range(1, 4): i /= 4 logging.debug(i) logging.debug("after loop") if i == 4: print("Hello PyConFR 2017") logging.debug("Hello PyConFR 2017") logging.info('end program') if __name__ == '__main__': main() 10 / 107
12. Utilisons logging # Example 3 import logging def main(): logging.basicConfig(level=logging.INFO) logging.info('start program') logging.debug("before loop") for i in range(1, 4): i /= 4 logging.debug(i) logging.debug("after loop") if i == 4: print("Hello PyConFR 2017") logging.debug("Hello PyConFR 2017") logging.info('end program') if __name__ == '__main__': main() INFO:root:start program INFO:root:end program 11 / 107
13. Utilisons logging # Example 4 import logging def main(): logging.basicConfig(level=logging.DEBUG) logging.info('start program') logging.debug("before loop") for i in range(1, 4): i /= 4 logging.debug(i) logging.debug("after loop") if i == 4: print("Hello PyConFR 2017") logging.debug("Hello PyConFR 2017") logging.info('end program') if __name__ == '__main__': main() 12 / 107
14. Utilisons logging INFO:root:start program DEBUG:root:before loop DEBUG:root:0 DEBUG:root:0 DEBUG:root:0 DEBUG:root:after loop INFO:root:end program 13 / 107
15. Utilisons logging INFO:root:start program DEBUG:root:before loop DEBUG:root:0 DEBUG:root:0 DEBUG:root:0 DEBUG:root:after loop INFO:root:end program Obligé de modifier le niveau de log pour voir ce qu'il se passe. 14 / 107
16. Cool mais Modification du code Execution Oubli de supprimer le print en production... 15 / 107
17. que faire, quoi utiliser... 16 / 107
18. Un debugger! 17 / 107
19. PDB Python Debugger est l'outil natif pour aider les développeurs à trouver et corriger les bugs de leur logiciel fétiche (ou celui que l'on récupère d'un ancien collègue ou prestataire...) 18 / 107
20. Eh oui, Python vient avec un debugger! 19 / 107
21. Comment faire import pdb; pdb.set_trace() 20 / 107
22. Comment faire import pdb; pdb.set_trace() # Example 5 import pdb def main(): for i in range(1, 4): i /= 4 if i == 4: print("Hello PyConFR 2017") if __name__ == '__main__': pdb.set_trace() main() 21 / 107
23. Comment faire import pdb; pdb.set_trace() # Example 5 import pdb def main(): for i in range(1, 4): i /= 4 if i == 4: print("Hello PyConFR 2017") if __name__ == '__main__': pdb.set_trace() main() $ python example5.py > example5.py(7)main() -> for i in range(1, 4): 22 / 107
24. Comment faire Example 6 import pdb def do_something(): raise Exception("bug") def main(): try: do_something() except Exception: pdb.post_mortem() if __name__ == '__main__': main() 23 / 107
25. Comment faire Example 6 import pdb def do_something(): raise Exception("bug") def main(): try: do_something() except Exception: pdb.post_mortem() if __name__ == '__main__': main() > example6.py(4)do_something() -> raise Exception("bug") (Pdb) bt example6.py(8)main() -> do_something() > example6.py(4)do_something() -> raise Exception("bug") (Pdb) ll 3 def do_something(): 4 -> raise Exception("bug") (Pdb) 24 / 107
26. Comment faire On peut aussi charger pdb comme un module à la ligne de commande. $ python -m pdb <file.py> $ python -m pdb -c "command" <file.py> 25 / 107
27. Prenons un exemple lisant un .csv 26 / 107
28. Prenons un exemple lisant un .csv import pendulum import csv class Event: def __init__(self, name, date): self.name = name self.date = pendulum.parse(date) def get_events(stream): for row in csv.reader(stream): yield Event(*row) def main(): with open('events.csv') as stream: for event in get_events(stream): print(event.name, event.date) if __name__ == '__main__': main() 27 / 107
29. Prenons un exemple lisant un .csv import pendulum import csv class Event: def __init__(self, name, date): self.name = name self.date = pendulum.parse(date) def get_events(stream): for row in csv.reader(stream): yield Event(*row) def main(): with open('events.csv') as stream: for event in get_events(stream): print(event.name, event.date) if __name__ == '__main__': main() PyCon France,2017-09-21 PyCon Canada,2017-11-18 PyCon US,2017-05-17 Python FOSDEM,2018-02-03 Python TOTO,x 28 / 107
30. Prenons un exemple lisant un .csv $ python events.py Non d'un petit Python, CRASH avec deux exceptions :/ PyCon France 2017-09-21T00:00:00+00:00 PyCon Canada 2017-11-18T00:00:00+00:00 PyCon US 2017-05-17T00:00:00+00:00 Python FOSDEM 2018-02-03T00:00:00+00:00 File "/home/stephane/.virtualenvs/flask/lib/python3.6/site-packages/dateutil/par raise ValueError("Unknown string format") ValueError: Unknown string format During handling of the above exception, another exception occurred: File "/home/stephane/.virtualenvs/flask/lib/python3.6/site-packages/pendulum/par raise ParserError('Invalid date string: {}'.format(text)) pendulum.parsing.exceptions.ParserError: Invalid date string: x 29 / 107
31. Je débugge $ python -m pdb events.py > events.py(1)<module>() -> import pendulum (Pdb) 30 / 107
32. Je liste mon code avec l ou ll (Pdb) ll 1 -> import pendulum 2 import csv 3 4 class Event: 5 def __init__(self, name, date): 6 self.name = name 7 self.date = pendulum.parse(date) 8 9 def get_events(stream): 10 for row in csv.reader(stream): 11 yield Event(*row) 12 13 def main(): 14 with open('events.csv') as stream: 15 for event in get_events(stream): 16 print(event.name, event.date) 17 18 if __name__ == '__main__': 19 main() 31 / 107
33. J'avance d'une ligne (Pdb) next > events.py(2)<module>() -> import csv 32 / 107
34. J'avance d'une ligne (Pdb) next > events.py(2)<module>() -> import csv (Pdb) ll 1 import pendulum 2 -> import csv 3 4 class Event: 5 def __init__(self, name, date): 6 self.name = name 7 self.date = pendulum.parse(date) 8 9 def get_events(stream): 10 for row in csv.reader(stream): 11 yield Event(*row) 12 13 def main(): 14 with open('events.csv') as stream: 15 for event in get_events(stream): 16 print(event.name, event.date) 17 18 if __name__ == '__main__': 19 main() 33 / 107
35. On saute dans le code -> def main(): (Pdb) ll 15 -> def main(): 16 with open('events.csv') as stream: 17 for event in get_events(stream): 18 print(event.name, event.date) 19 print(Event.id) (Pdb) step > events.py(16)main() -> with open('events.csv') as stream: (Pdb) ll 15 def main(): 16 -> with open('events.csv') as stream: 17 for event in get_events(stream): 18 print(event.name, event.date) 19 print(Event.id) 34 / 107
36. On saute dans le code (Pdb) next > events.py(17)main() -> for event in get_events(stream): (Pdb) ll 15 def main(): 16 with open('events.csv') as stream: 17 -> for event in get_events(stream): 18 print(event.name, event.date) 19 print(Event.id) (Pdb) step --Call-- > events.py(11)get_events() -> def get_events(stream): (Pdb) ll 11 -> def get_events(stream): 12 for row in csv.reader(stream): 13 yield Event(*row) (Pdb) next > events.py(12)get_events() -> for row in csv.reader(stream): (Pdb) ll 11 def get_events(stream): 12 -> for row in csv.reader(stream): 13 yield Event(*row) (Pdb) 35 / 107
37. Breakpoints Je reprends le code de base 36 / 107
38. Breakpoints (Pdb) ll 1 import pendulum 2 import csv 3 4 class Event: 5 def __init__(self, name, date): 6 self.name = name 7 self.date = pendulum.parse(date) 8 9 def get_events(stream): 10 for row in csv.reader(stream): 11 yield Event(*row) 12 13 def main(): 14 with open('events.csv') as stream: 15 for event in get_events(stream): 16 print(event.name, event.date) 17 18 if __name__ == '__main__': 19 main() 37 / 107
39. Breakpoints Lister > events.py(1)<module>() -> import pendulum (Pdb) break (Pdb) 38 / 107
40. Breakpoints Ajouter > events.py(1)<module>() -> import pendulum (Pdb) break 9 Breakpoint 1 at events.py:9 (Pdb) l 4 class Event: 5 id = 0 6 def __init__(self, name, date): 7 self.id += 1 8 self.name = name 9 B-> self.date = pendulum.parse(date) 10 11 def get_events(stream): 12 for row in csv.reader(stream): 13 yield Event(*row) 39 / 107
41. Breakpoints Ajouter > events.py(1)<module>() -> import pendulum (Pdb) break 9 Breakpoint 1 at events.py:9 (Pdb) l 4 class Event: 5 id = 0 6 def __init__(self, name, date): 7 self.id += 1 8 self.name = name 9 B-> self.date = pendulum.parse(date) 10 11 def get_events(stream): 12 for row in csv.reader(stream): 13 yield Event(*row) (Pdb) break Num Type Disp Enb Where 1 breakpoint keep yes at events.py:9 40 / 107
42. Breakpoints Désactiver un breakpoint (Pdb) disable 1 Disabled breakpoint 1 at events.py:9 41 / 107
43. Breakpoints Désactiver un breakpoint (Pdb) disable 1 Disabled breakpoint 1 at events.py:9 (Pdb) break Num Type Disp Enb Where 1 breakpoint keep no at events.py:9 42 / 107
44. Breakpoints Activer un breakpoint (Pdb) enable 1 Enabled breakpoint 1 at events.py:9 43 / 107
45. Breakpoints Activer un breakpoint (Pdb) enable 1 Enabled breakpoint 1 at events.py:9 (Pdb) break Num Type Disp Enb Where 1 breakpoint keep yes at events.py:9 44 / 107
46. Je continue (Pdb) continue > events.py(9)__init__() -> self.date = pendulum.parse(date) 45 / 107
47. J'examine (Pdb) args self = <__main__.Event object at 0x7f23cf8cc908> name = 'PyCon France' date = '2017-09-21' 46 / 107
48. J'examine (Pdb) args self = <__main__.Event object at 0x7f23cf8cc908> name = 'PyCon France' date = '2017-09-21' (Pdb) whatis name <class 'str'> (Pdb) whatis self <class '__main__.Event'> 47 / 107
49. Nouvelles commandes avec alias alias d pp dir(%1) 48 / 107
50. Nouvelles commandes avec alias alias d pp dir(%1) (Pdb) b 9 Breakpoint 1 at events.py:9 (Pdb) c > events.py(9)__init__() -> self.date = pendulum.parse(date) 49 / 107
51. Nouvelles commandes avec alias alias d pp dir(%1) (Pdb) b 9 Breakpoint 1 at events.py:9 (Pdb) c > events.py(9)__init__() -> self.date = pendulum.parse(date) (Pdb) d self.__dict__ ['__class__', '__contains__', '__delattr__', ... ] 50 / 107
52. Nouvelles commandes avec alias alias loc !list(locals().keys()) 51 / 107
53. Nouvelles commandes avec alias alias loc !list(locals().keys()) (Pdb) loc dict_keys(['date', 'name', 'self']) 52 / 107
54. Nouvelles commandes avec alias alias printdict for key, value in %1.items(): print(f"{key}:{value}") 53 / 107
55. Nouvelles commandes avec alias alias printdict for key, value in %1.items(): print(f"{key}:{value}") (Pdb) printdict self.__dict__ id:1 name:PyCon France date:2017-09-21T00:00:00+00:00 54 / 107
56. Réutilisation d'alias alias pd printdict %1 55 / 107
57. Réutilisation d'alias alias pd printdict %1 (Pdb) pd self.__dict__ id:1 name:PyCon France date:2017-09-21T00:00:00+00:00 56 / 107
58. Breakpoint et une action Possibilité de définir une action lors d'un breakpoint commands [bpnumber] p self.__dict__ printdict self.__dict__ end 57 / 107
59. Démonstration 58 / 107
60. PDB Récapitulatif des commandes 59 / 107
61. Les importantes Commande Description h(elp) Affiche l'aide h(elp) command Affiche l'aide d'une commande q(uit) Quitte le debuggeur 60 / 107
62. Examiner Commande Description p(rint) expr Affiche la valeur de l'expression pp expr Pretty-print de la valeur de l'expression l(ist) Affiche une partie du code ll Affiche toute le code de la fonction a(rgs) Affiche la liste des arguments de la fonction whatis arg Affiche le type de l'argument where Mais ou se trouve l'exception source Affiche la source d'une fonction 61 / 107
63. Naviguer Commande Description n(ext) Exécute l'instruction s(tep) Exécute et rentre dans la fonction/méthode r(eturn) Continue l'exécution jusqu'au return c(ontinue) Continue l'exécution jusqu'à un breakpoint u(p) Remonte d'un niveau dans la stack trace d(own) Descend d'un niveau dans la stack trace j(ump) lineno Saute a la ligne 62 / 107
64. Breakpoints Commande Description b(reak) Montre tous les breakpoints 63 / 107
65. Breakpoints Commande Description b(reak) lineno Place un breakpoint à lineno b(reak) lineno, cond Place un breakpoint à lineo si cond est True b(reak) file:lineno Place un breakpoint dans le fichier file à la ligne lineno b(reak) func Place un breakpoint à la première ligne de la fonction func tbreak lineno Place un breakpoint et l'enleve dès que l'on y est 64 / 107
66. Breakpoints Commande Description clear bpnumber Supprime un breakpoint disable bpnumber Désactive un breakpoint enable bpnumber Active un breakpoint ignore bpnumber count Ignore le breakpoint X fois condition bpnumber condition Permet de modifer le breakpoint 65 / 107
67. Celles que vous ne connaissez pas ;-) Commande Description !expr Execute une expression dans l'interpreteur Python alias Créer une nouvelle commande PDB unalias Supprime un alias commands [bpnumber] Assigne des commandes à un breakpoint restart or run Redémarre le script 66 / 107
68. Fichier de con guration alias d pp dir(%1) alias ps d self.__dict__ alias loc !list(locals().keys()) alias printdict for key, value in %1.items(): print(f"{key}:{value}") Voir $HOME/.pdbrc ou ./.pdbrc 67 / 107
69. Il y a un truc amusant 68 / 107
70. Ça fonctionne avec ipdb 69 / 107
71. Les alternatives - ipdb Auto-completion Coloration syntaxique Meilleurs tracebacks Meilleur introspection Commandes supplémentaires https://github.com/gotcha/ipdb 70 / 107
72. Les alternatives - pudb https://github.com/inducer/pudb 71 / 107
73. Les alternatives - rdb import pdb, socket, sys # noqa --> Pas PEP8 class Rdb(pdb.Pdb): def __init__(self, port=4444): self.old_stdout = sys.stdout self.old_stdin = sys.stdin self.skt = socket.socket(socket.AF_INET, socket.SOCK_STREAM) self.skt.bind(('localhost', port)) self.skt.listen(1) (clientsocket, address) = self.skt.accept() handle = clientsocket.makefile('rw') pdb.Pdb.__init__(self, completekey='tab', stdin=handle, stdout=handle) sys.stdout = sys.stdin = handle def do_continue(self, arg): sys.stdout = self.old_stdout sys.stdin = self.old_stdin self.skt.close() self.set_continue() return 1 do_c = do_cont = do_continue https://dzone.com/articles/remote-debugging-python-using 72 / 107
74. Les alternatives - rdb (2) # Example usage - connect with 'telnet 4444' if __name__=='__main__': def buggy_method(): x = 3 remote_debug = Rdb() remote_debug.set_trace() print(x) buggy_method() https://dzone.com/articles/remote-debugging-python-using 73 / 107
75. Les alternatives - rdb (3) telnet localhost 4444 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. > rdb.py(32)buggy_method() -> print(x) (Pdb) ll 28 def buggy_method(): 29 x = 3 30 remote_debug = Rdb() 31 remote_debug.set_trace() 32 -> print(x) (Pdb) p x 3 (Pdb) quit Connection closed by foreign host. Meilleure implémentation dans https://github.com/celery/celery/blob/master/celery/contrib/rdb.py https://dzone.com/articles/remote-debugging-python-using 74 / 107
76. Les alternatives - wdb https://github.com/Kozea/wdb 75 / 107
77. Les alternatives - pdbpp https://github.com/antocuni/pdb 76 / 107
78. pdb ou ipdb avec du dev Web Par exemple, Django django-pdb avec --ipdb ou --pdb ou simplement python -m pdb ./manage.py test python -m ipdb ./manage.py test python -m pudb ./manage.py test 77 / 107
79. GNU Debugger Également nommé gdb, GNU Debugger, est le débuggeur standard du projet GNU, portable et fonctionne pour plusieurs langages, comme le C, le C++ et aussi le Python ;-) 78 / 107
80. GNU Debugger gdb >= 7 , support natif de Python 79 / 107
81. GNU Debugger Avoir les symboles de debug de Python $ dnf install python3-debug 80 / 107
82. GNU Debugger Avoir les symboles de debug de Python $ dnf install python3-debug ou $ ./configure --prefix=$PWD-build --with-pydebug $ make $ make install 81 / 107
83. GNU Debugger Python + gdb = ? 82 / 107
84. GNU Debugger Python + gdb = ? 1. il y a une librairie pour debugger votre script Python depuis gdb 83 / 107
85. GNU Debugger Python + gdb = ? 1. il y a une librairie pour debugger votre script Python depuis gdb 2. gdb est extensible via Python 84 / 107
86. Que faire avec gdb ? Commande Description py-bt Montre la stack trace Python py-bt-full py-bt mais en plus verbeux py-list Liste le code Python py-print Affiche le contenu d'une variable Python py-locals Affiche les locals py-up Remonte d'une frame py-down Descend d'une frame 85 / 107
87. Le code import time import os def next(i): print(f"{os.getpid()} {time.strftime('%H:%M:%S')}") time.sleep(10) i = 1 - i i = 1 while True: next(i) 86 / 107
88. Le code import time import os def next(i): print(f"{os.getpid()} {time.strftime('%H:%M:%S')}") time.sleep(10) i = 1 - i i = 1 while True: next(i) $ python ex_loop1.py 10619 06:14:24 10619 06:14:34 10619 06:14:44 10619 06:14:54 10619 06:15:04 10619 06:15:14 PID 10619 87 / 107
89. Comment faire ? $ gdb -p 10619 GNU gdb (GDB) Fedora 8.0.1-26.fc26 ... For help, type "help". Type "apropos word" to search for commands related to "word". Attaching to process 10619 Reading symbols from /usr/bin/python3.6dm...Reading symbols from /usr/lib/debug/us Reading symbols from /lib64/libpython3.6dm.so.1.0...Reading symbols from /usr/lib/d Reading symbols from /lib64/libpthread.so.0...Reading symbols from /usr/lib/debug/ [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". Reading symbols from /lib64/libdl.so.2...Reading symbols from /usr/lib/debug/usr/li Reading symbols from /lib64/libutil.so.1...Reading symbols from /usr/lib/debug/usr Reading symbols from /lib64/libm.so.6...Reading symbols from /usr/lib/debug/usr/li Reading symbols from /lib64/libc.so.6...Reading symbols from /usr/lib/debug/usr/li Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/de 0x00007f40dc696ce3 in __select_nocancel () at ../sysdeps/unix/syscall-template.S:84 84 T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS) (gdb) 88 / 107
90. A cher le code (gdb) py-list 1 import time 2 import os 3 4 def next(i): 5 print(f"{os.getpid()} {time.strftime('%H:%M:%S')}") >6 time.sleep(10) 7 i = 1 - i 8 9 i = 1 10 while True: 11 next(i) (gdb) 89 / 107
91. A cher la traceback (gdb) py-bt Traceback (most recent call first): <built-in method sleep of module object at remote 0x7f40d590fd58> File "ex_loop1.py", line 6, in next time.sleep(10) File "ex_loop1.py", line 11, in <module> next(i) 90 / 107
92. A cher la traceback avec plus d'infos (gdb) py-bt-full #3 <built-in method sleep of module object at remote 0x7f40d590fd58> #7 Frame 0x55c890804748, for file ex_loop1.py, line 6, in next (i=1) time.sleep(10) #12 Frame 0x55c890804458, for file ex_loop1.py, line 11, in <module> () next(i) 91 / 107
93. A cher la traceback avec plus d'infos (gdb) py-bt-full #3 <built-in method sleep of module object at remote 0x7f40d590fd58> #7 Frame 0x55c890804748, for file ex_loop1.py, line 6, in next (i=1) time.sleep(10) #12 Frame 0x55c890804458, for file ex_loop1.py, line 11, in <module> () next(i) (gdb) select-frame 7 (gdb) info locals tstate = 0x55c8907a3cf0 (gdb) select-frame 3 (gdb) info locals func = 0x7f40d5974418 meth = 0x7f40dd57c6c6 <time_sleep> self = <module at remote 0x7f40d590fd58> result = 'sleep' flags = 8 __PRETTY_FUNCTION__ = "_PyCFunction_FastCallDict" 92 / 107
94. Examiner une frame (gdb) py-bt-full #3 <built-in method sleep of module object at remote 0x7fc8e71bad58> #7 Frame 0x55706036f748, for file ex_loop1.py, line 6, in next (i=1) time.sleep(10) #12 Frame 0x55706036f458, for file ex_loop1.py, line 11, in <module> () next(i) (gdb) select-frame 7 (gdb) py-list 1 import time 2 import os 3 4 def next(i): 5 print(f"{os.getpid()} {time.strftime('%H:%M:%S')}") >6 time.sleep(10) 7 i = 1 - i 8 9 i = 1 10 while True: 11 next(i) (gdb) py-print i local 'i' = 1 (gdb) py-locals i = 1 93 / 107
95. Navigation (gdb) py-down Unable to find a newer python frame (gdb) py-up #7 Frame 0x55c890804748, for file ex_loop1.py, line 6, in next (i=1) time.sleep(10) (gdb) py-down #3 <built-in method sleep of module object at remote 0x7f40d590fd58> 94 / 107
96. Backtrace de CPython (gdb) bt #0 0x00007f40dc696ce3 in __select_nocancel () at ../sysdeps/unix/syscall-template #1 0x00007f40dd57e7f8 in pysleep (secs=10000000000) at /usr/src/debug/Python-3.6.2/Modules/timemodule.c:1438 #2 0x00007f40dd57c73d in time_sleep (self=<module at remote 0x7f40d590fd58>, obj= at /usr/src/debug/Python-3.6.2/Modules/timemodule.c:235 #3 0x00007f40dd39a9af in _PyCFunction_FastCallDict ( func_obj=<built-in method sleep of module object at remote 0x7f40d590fd58>, args=0x55c8908048e0, nargs=1, kwargs=0x0) at /usr/src/debug/Python-3.6.2/Objects/methodobject.c:209 #4 0x00007f40dd39ada6 in _PyCFunction_FastCallKeywords ( func=<built-in method sleep of module object at remote 0x7f40d590fd58>, stack=0x55c8908048e0, nargs=1, kwnames=0x0) at /usr/src/debug/Python-3.6.2/Objects/methodobject.c:294 #5 0x00007f40dd4b046e in call_function (pp_stack=0x7ffd7bcab7b8, oparg=1, kwnames= at /usr/src/debug/Python-3.6.2/Python/ceval.c:4809 #6 0x00007f40dd4a8046 in _PyEval_EvalFrameDefault ( f=Frame 0x55c890804748, for file ex_loop1.py, line 6, in next (i=1), throwflag= at /usr/src/debug/Python-3.6.2/Python/ceval.c:3295 #7 0x00007f40dd494118 in PyEval_EvalFrameEx ( f=Frame 0x55c890804748, for file ex_loop1.py, line 6, in next (i=1), throwflag= at /usr/src/debug/Python-3.6.2/Python/ceval.c:718 95 / 107
97. Threads (gdb) info threads Id Target Id Frame 1 Thread 0x7f40ddaef700 (LWP 10619) "python3-debug" 0x00007f40dd39a9af in _PyC args=0x55c8908048e0, nargs=1, kwargs=0x0) at /usr/src/debug/Python-3.6.2/Objects/methodobject.c:209 96 / 107
98. Dumper les stack traces des threads (gdb) thread apply all py-bt Thread 1 (Thread 0x7f40ddaef700 (LWP 10619)): Traceback (most recent call first): <built-in method sleep of module object at remote 0x7f40d590fd58> File "ex_loop1.py", line 6, in next time.sleep(10) File "ex_loop1.py", line 11, in <module> next(i) (gdb) 97 / 107
99. Débugger à distance 98 / 107
100. Mode Remote - gdbserver $ gdbserver --multi host:2345 # # ou ces modes-ci # $ gdbserver host:2345 process_name $ gdbserver host:2345 --attach PID 99 / 107
101. Mode Remote - gdbserver $ gdbserver --multi host:2345 # # ou ces modes-ci # $ gdbserver host:2345 process_name $ gdbserver host:2345 --attach PID $ gdb (gdb) target extended-remote host:2345 (gdb) attach PID 100 / 107
102. Mode Remote - gdbserver $ gdbserver --multi host:2345 # # ou ces modes-ci # $ gdbserver host:2345 process_name $ gdbserver host:2345 --attach PID $ gdb (gdb) target extended-remote host:2345 (gdb) attach PID (gdb) py-list 1 import time 2 import os 3 4 def next(i): 5 print(f"{os.getpid()} {time.strftime('%H:%M:%S')}") >6 time.sleep(10) 7 i = 1 - i 8 9 i = 1 10 while True: 11 next(i) (gdb) 101 / 107
103. Extensible ? 102 / 107
104. Extensible ? - Oui https://github.com/cyrus-and/gdb-dashboardOui 103 / 107
105. Alternatives 104 / 107
106. gdbgui pip install gdbgui 105 / 107
107. Prochaines talks pour 2018 SystemTap et DTrace pour mon Python Que fait mon débuggeur Python? GDB en profondeur 106 / 107
108. Questions ? stephane@mgx.io 107 / 107