python / python/cpython

AttributeError on `with super()`

未关闭
#129,466 13 条评论 0 个 reaction 已指派 0 人 在 GitHub 查看

还没有人认领这个 Issue。

interpreter-core type-feature
主要语言
Python
星标
77.2k
派生
35.9k
PR 合并指标
PR 指标待抓取

描述

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

贡献指南

打开贡献指南

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

调研方向

先在 CPython 3.13 或 3.12 上复现所提供的 DerivedUsingWith 和 DerivedUsingExitStack 示例,然后跟踪涉及的 super() 和上下文管理器入口点。将它们与正常工作的 super().enter() 和 super().exit() 情况进行比较;完成意味着预期行为已确定,并且报告的 AttributeError 已由回归测试覆盖。

由索引模型根据 Issue 内容生成。

评估

技术栈
python
领域
compilers
Issue 类型
缺陷
难度
4/5
预计耗时
3-5 天
活跃度
停滞
描述清晰度
基本清楚
新手友好度
35/100

把新 issue 发到你的邮箱

精选适合新手参与的 GitHub issue 摘要。