AttributeError on `with super()`
Nobody has claimed this yet.
- Dominant language
- Python
- Stars
- 77.2k
- Forks
- 35.9k
- PR merge metrics
- PR metrics pending
Description
Bug report
Bug description:
Writing with super() raises an AttributeError. I ran into this implementing context managers inspired by contextlib.contextmnager but which had extra functionality. I can see no reason why with super() should be disallowed, and in fact, super().__enter__() and super().__exit__() work just fine.
Attempting to use an ExitStack as a work around was unsuccessful.
import sys
from contextlib import ExitStack
class Base:
def __enter__(self):
print("Entering base context manager")
def __exit__(self, type, value, traceback):
print("Exiting base context manager")
def __derived_enter__(self):
self.context = self.contextlib_style_context()
next(self.context)
return self.context
def __derived_exit__(self, type, value, traceback):
try:
next(self.context)
except StopIteration:
pass
class DerivedUsingEnterExit(Base):
def contextlib_style_context(self):
print("Entering contextlib style context manager")
super().__enter__()
try:
yield
finally:
super().__exit__(*sys.exc_info())
print("Exiting contextlib style context manager")
__enter__ = __derived_enter__
__exit__ = __derived_exit__
class DerivedUsingWith(Base):
def contextlib_style_context(self):
print("Entering contextlib style context manager")
with super():
yield
print("Exiting contextlib style context manager")
__enter__ = __derived_enter__
__exit__ = __derived_exit__
class DerivedUsingExitStack(Base):
def contextlib_style_context(self):
print("Entering contextlib style context manager")
with ExitStack() as stack:
stack.enter_context(super())
yield
print("Exiting contextlib style context manager")
__enter__ = __derived_enter__
__exit__ = __derived_exit__
# Runs successfully
with DerivedUsingEnterExit() as d:
pass
# Raises AttributeError
with DerivedUsingWith() as d:
pass
# Raises AttributeError
with DerivedUsingExitStack() as d:
pass
CPython versions tested on:
3.13, 3.12
Operating systems tested on:
Windows
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the supplied DerivedUsingWith and DerivedUsingExitStack examples on CPython 3.13 or 3.12, then trace the super() and context-manager entry points involved. Compare them with the working super().enter() and super().exit() case; done means the intended behavior is decided and the reported AttributeError is covered by a regression test.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100