[issue42848] asyncio produces an unexpected traceback with recursive __getattribute__
asleep-cult added the comment: I'm not sure I have a deep enough understanding of how this works, so no -- ___ Python tracker <https://bugs.python.org/issue42848> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue42848] asyncio produces an unexpected traceback with recursive __getattribute__
asleep-cult added the comment:
Didn't show enough of the traceback to show that the latter does not suppress
the Test exception
Traceback (most recent call last):
File "c:/Development/test/test.py", line 11, in bar
x()
File "c:/Development/test/test.py", line 7, in x
raise Test('Hello World!')
__main__.Test: Hello World!
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "c:/Development/test/test.py", line 19, in
bar()
File "c:/Development/test/test.py", line 14, in bar
bar()
File "c:/Development/test/test.py", line 14, in bar
bar()
File "c:/Development/test/test.py", line 14, in bar
bar()
[Previous line repeated 994 more times]
File "c:/Development/test/test.py", line 11, in bar
x()
File "c:/Development/test/test.py", line 7, in x
raise Test('Hello World!')
RecursionError: maximum recursion depth exceeded while calling a Python object
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "c:/Development/test/test.py", line 21, in
traceback.print_exc()
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 163, in print_exc
print_exception(*sys.exc_info(), limit=limit, file=file, chain=chain)
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 103, in print_exception
for line in TracebackException(
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 493, in __init__
context = TracebackException(
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 493, in __init__
context = TracebackException(
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 493, in __init__
context = TracebackException(
[Previous line repeated 495 more times]
RecursionError: maximum recursion depth exceeded
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[issue42848] asyncio produces an unexpected traceback with recursive __getattribute__
asleep-cult added the comment:
I did test it with a simple recursive function but a more realistic test
confirms that its not just __getattribute__ (which makes sense)
import asyncio
class Test(Exception):
...
def x():
raise Test('Hello World!')
def bar():
try:
x()
except Test as e:
try:
bar()
except Test as e:
raise e
async def foo():
bar()
loop = asyncio.get_event_loop()
loop.create_task(foo())
loop.run_forever()
Traceback:
Exception in default exception handler
Traceback (most recent call last):
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py",
line 1733, in call_exception_handlerself.default_exception_handler(context)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py",
line 1707, in default_exception_handler
logger.error('\n'.join(log_lines), exc_info=exc_info)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 1471, in error
self._log(ERROR, msg, args, **kwargs)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 1585, in _log
self.handle(record)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 1595, in handle
self.callHandlers(record)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 1665, in callHandlers
lastResort.handle(record)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 950, in handle
self.emit(record)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 1081, in emit
msg = self.format(record)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 925, in format
return fmt.format(record)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 672, in format
record.exc_text = self.formatException(record.exc_info)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 622, in formatException
traceback.print_exception(ei[0], ei[1], tb, None, sio)
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 103, in print_exception
for line in TracebackException(
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 493, in __init__
context = TracebackException(
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 493, in __init__
context = TracebackException(
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 493, in __init__
context = TracebackException(
[Previous line repeated 488 more times]
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 476, in __init__
_seen.add(id(exc_value))
RecursionError: maximum recursion depth exceeded while calling a Python object
The Test('Hello World') exception is suppressed entirely
try:
bar()
except:
traceback.print_exc()
but when running it this way the traceback looks like this:
File "c:/Development/test/test.py", line 7, in x
raise Test('Hello World!')
RecursionError: maximum recursion depth exceeded while calling a Python object
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "c:/Development/test/test.py", line 21, in
traceback.print_exc()
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 163, in print_exc
print_exception(*sys.exc_info(), limit=limit, file=file, chain=chain)
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 103, in print_exception
for line in TracebackException(
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 493, in __init__
context = TracebackException(
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 493, in __init__
context = TracebackException(
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 493, in __init__
context = TracebackException(
[Previous line repeated 495 more times]
RecursionError: maximum recursion depth exceeded
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[issue42848] asyncio produces an unexpected traceback with recursive __getattribute__
New submission from asleep-cult :
The code below produces an unexpected traceback format that makes the source of
an error very hard to find, this more than likely happens in less specific
situations but this is how I came across it. I'm also not sure if this is an
issue with asyncio, logging or the traceback module.
import asyncio
class Bar:
def __init__(self):
self.y = None
class Foo:
def __init__(self):
self._bar = Bar()
self.y
def __getattribute__(self, name):
try:
attr = super().__getattribute__(name)
except AttributeError as e:
try:
attr = self.ooops_spelled_bar_wrong.__getattribute__(name)
except AttributeError:
raise e
return attr
async def foo():
Foo()
loop = asyncio.get_event_loop()
loop.create_task(foo())
loop.run_forever()
Traceback:
Exception in default exception handler
Traceback (most recent call last):
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py",
line 1733, in call_exception_handlerself.default_exception_handler(context)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py",
line 1707, in default_exception_handler
logger.error('\n'.join(log_lines), exc_info=exc_info)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 1471, in error
self._log(ERROR, msg, args, **kwargs)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 1585, in _log
self.handle(record)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 1595, in handle
self.callHandlers(record)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 1665, in callHandlers
lastResort.handle(record)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 950, in handle
self.emit(record)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 1081, in emit
msg = self.format(record)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 925, in format
return fmt.format(record)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 672, in format
record.exc_text = self.formatException(record.exc_info)
File
"C:\Users\User\AppData\Local\Programs\Python\Python38\lib\logging\__init__.py",
line 622, in formatException
traceback.print_exception(ei[0], ei[1], tb, None, sio)
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 103, in print_exception
for line in TracebackException(
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 493, in __init__
context = TracebackException(
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 493, in __init__
context = TracebackException(
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 493, in __init__
context = TracebackException(
[Previous line repeated 488 more times]
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\traceback.py",
line 476, in __init__
_seen.add(id(exc_value))
RecursionError: maximum recursion depth exceeded while calling a Python object
```
The code below procures the expected traceback
import traceback
class Bar:
def __init__(self):
self.y = None
class Foo:
def __init__(self):
self._bar = Bar()
self.y
def __getattribute__(self, name):
try:
attr = super().__getattribute__(name)
except AttributeError as e:
try:
attr = self.ooops_spelled_bar_wrong.__getattribute__(name)
except AttributeError:
raise e
return attr
try:
Foo()
except:
traceback.print_exc()
Traceback:
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "c:/Development/test/test.py", line 15, in __getattribute__
attr = super().__getattribute__(name)
AttributeError: 'Foo' object has no attribute 'ooops_spelled_bar_wrong'
# The part above is repeated hundreds of times
Traceback (most recent call last):
File "c:/Development/test/test.py", line 24, in
Foo()
File "c:/Development/test/test.py", line 11, in __init__
self.y
File "c:/Development/test/test.py", line 18, in __getattribute__
attr = self.ooops_spelled_bar_wrong.__getattribute__(name)
File "c:/Development/test/test.py", line 18, in __getattribute__
attr = self.ooops_spelled_bar_
