Error when debugging logging.FileHandler subclass __init__ method

[fcodvpt]

BPO	42119
Nosy	@Fidget-Spinner, @fcodvpt, @akulakov
Superseder	bpo-20853: pdb "args" crashes when an arg is not printable
Files	multiprocesses-to-files-with-dict.py: Code with the FileHandler subclass

^{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 2021-09-10.15:05:22.816>
created_at = <Date 2020-10-22.16:37:47.672>
labels = ['3.8', '3.9', '3.10', '3.11', 'type-feature', 'library']
title = 'Error when debugging logging.FileHandler subclass __init__ method'
updated_at = <Date 2021-09-12.15:06:19.517>
user = 'https://github.com/fcodvpt'

bugs.python.org fields:

activity = <Date 2021-09-12.15:06:19.517>
actor = 'andrei.avk'
assignee = 'none'
closed = True
closed_date = <Date 2021-09-10.15:05:22.816>
closer = 'andrei.avk'
components = ['Library (Lib)']
creation = <Date 2020-10-22.16:37:47.672>
creator = 'fcodvpt'
dependencies = []
files = ['49535']
hgrepos = []
issue_num = 42119
keywords = []
message_count = 3.0
messages = ['379313', '398452', '401668']
nosy_count = 3.0
nosy_names = ['kj', 'fcodvpt', 'andrei.avk']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '20853'
type = 'enhancement'
url = 'https://bugs.python.org/issue42119'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10', 'Python 3.11']

[fcodvpt]

In pdb, when I hit "a" to see __init__ parameters of a logging.FileHandler subclass, I get an error because __repr__ needs a logging level. The level has been removed from the parameters by configure_handler() when it instanciates the handler. The level is set after the handler instanciation.

I do not know if it can be changed or if I missed something.

Traceback (most recent call last):
  File "/usr/lib/python3.8/logging/config.py", line 563, in configure
    handler = self.configure_handler(handlers[name])
  File "/usr/lib/python3.8/logging/config.py", line 744, in configure_handler
    result = factory(**kwargs)
  File "/home/fconil/Progs/python/logging/multiprocesses-to-files-with-dict.py", line 53, in __init__
    pfilename = f"{filename}-{os.getpid()}.log"
  File "/home/fconil/Progs/python/logging/multiprocesses-to-files-with-dict.py", line 53, in __init__
    pfilename = f"{filename}-{os.getpid()}.log"
  File "/usr/lib/python3.8/bdb.py", line 88, in trace_dispatch
    return self.dispatch_line(frame)
  File "/usr/lib/python3.8/bdb.py", line 112, in dispatch_line
    self.user_line(frame)
  File "/usr/lib/python3.8/pdb.py", line 262, in user_line
    self.interaction(frame, None)
  File "/usr/lib/python3.8/pdb.py", line 357, in interaction
    self._cmdloop()
  File "/usr/lib/python3.8/pdb.py", line 322, in _cmdloop
    self.cmdloop()
  File "/usr/lib/python3.8/cmd.py", line 138, in cmdloop
    stop = self.onecmd(line)
  File "/usr/lib/python3.8/pdb.py", line 423, in onecmd
    return cmd.Cmd.onecmd(self, line)
  File "/usr/lib/python3.8/cmd.py", line 217, in onecmd
    return func(arg)
  File "/usr/lib/python3.8/pdb.py", line 1146, in do_args
    self.message('%s = %r' % (name, dict[name]))
  File "/usr/lib/python3.8/logging/__init__.py", line 1186, in __repr__
    level = getLevelName(self.level)
AttributeError: 'MultiFileHandler' object has no attribute 'level'

[akulakov]

Françoise:

You can simply set the two attrs required by __repr__ in the pdb session:

./python.exe ~/temp/a.py --INS--

/Users/ak/opensource/cpython/Lib/logging/init.py(1152)init()
-> filename = os.fspath(filename)
(Pdb) self.level=1
(Pdb) self.baseFilename='test.log'
(Pdb) a
self = <FileHandler test.log (Level 1)>
filename = 'test.log'
mode = 'a'
encoding = None
delay = False
errors = None
(Pdb)

I think this can be closed as it's not a bug and there's a workaround as shown above.

[akulakov]

Changing from not a bug to duplicate of bpo-20853.