pytest运行触发AssertionError，疑与pluggy包相关

运行pytest时触发内部错误，抛出AssertionError，该问题疑似与pluggy包相关。异常发生在路径/home/test/project/env/lib/python3.8/site-packages/_pytest/terminal.py的第592行，具体为断言assert self._session失败。

完整报错栈信息如下：

INTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/_pytest/main.py", line 270, in wrap_session
INTERNALERROR>     session.exitstatus = doit(config, session) or 0
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/_pytest/main.py", line 324, in _main
INTERNALERROR>     config.hook.pytest_runtestloop(session=session)
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_hooks.py", line 265, in __call__
INTERNALERROR>     return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_manager.py", line 80, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_callers.py", line 60, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_result.py", line 60, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_callers.py", line 39, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/_pytest/main.py", line 349, in pytest_runtestloop
INTERNALERROR>     item.config.hook.pytest_runtest_protocol(item=item, nextitem=nextitem)
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_hooks.py", line 265, in __call__
INTERNALERROR>     return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_manager.py", line 80, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_callers.py", line 60, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_result.py", line 60, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_callers.py", line 39, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/_pytest/runner.py", line 113, in pytest_runtest_protocol
INTERNALERROR>     ihook.pytest_runtest_logfinish(nodeid=item.nodeid, location=item.location)
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_hooks.py", line 265, in __call__
INTERNALERROR>     return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_manager.py", line 80, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_callers.py", line 60, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_result.py", line 60, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/pluggy/_callers.py", line 39, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/home/test/project/env/lib/python3.8/site-packages/_pytest/terminal.py", line 592, in pytest_runtest_logfinish
INTERNALERROR>     assert self._session
INTERNALERROR> AssertionError

该断言逻辑对应pytest官方仓库中terminal.py的相关代码段，问题疑似关联pluggy项目。

可能的解决方案 #

• 版本兼容性检查：pytest与pluggy存在版本依赖关系，查看当前安装的pytest和pluggy版本，尝试升级或降级到官方推荐的匹配版本
• 重装依赖：删除虚拟环境中相关包，重新执行pip install pytest，确保依赖完整且无损坏
• 排查自定义插件：如果项目使用了自定义pytest插件，检查插件是否在钩子函数中错误修改了session状态，导致self._session被提前销毁
• 临时应急处理（不推荐）：若需紧急运行测试，可临时注释掉terminal.py中的assert self._session断言，但这只是权宜之计，需尽快定位根本原因

内容的提问来源于stack exchange，提问作者Lava Sangeetham