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TASK OBJECTIVE

pytest-dev/pytest

How do you stop pytest doctest collection from raising KeyError '__wrapped__' in inspect.unwrap?

KeyErrorPython traceback repairs

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01

TASK STATEMENT

verbatim agent-facing issue statement

KeyError: '__wrapped__' with from xxx import yyy
# Checklist

- [X] Include a detailed description of the bug or suggestion
- [ ] `pip list` of the virtual environment you are using
- [X] pytest and operating system versions
- [X] Minimal example if possible

# Description

I implemented `tox` and `pytest` for automated testing.  When I run the [MWE](https://github.com/ZaydH/pytest_bug), I get a `KeyError: '__wrapped__'` when I perform a `from xxx import yyy`.  

In the example I included, I do not get the KeyError if I comment out the line: 

...
from sty import fg
...


# Pip List

No virtual environment used.

# Version Info

*Python*: 3.6.5 & 3.7.1
*PyTest*: 4.4.0
*OS*: MacOS Mojave 10.14.4

# MWE

I created a very simple [repo](https://github.com/ZaydH/pytest_bug).  If I clone the repo and call either `tox` or `pytest` in the root directory, I get the error.

# Example Error Message

```
➜  pytest_bug git:(master) ✗ tox
GLOB sdist-make: /Users/zayd/repos/pytest_bug/setup.py
py36 recreate: /Users/zayd/repos/pytest_bug/.tox/py36
py36 installdeps: pytest, sty
py36 inst: /Users/zayd/repos/pytest_bug/.tox/.tmp/package/1/stratego-0.0.0.zip
py36 installed: atomicwrites==1.3.0,attrs==19.1.0,more-itertools==7.0.0,pluggy==0.9.0,py==1.8.0,pytest==4.4.0,six==1.12.0,stratego==0.0.0,sty==1.0.0b9
py36 run-test-pre: PYTHONHASHSEED='591797669'
py36 run-test: commands[0] | pytest
============================================================================================================== test session starts ==============================================================================================================
platform darwin -- Python 3.6.5, pytest-4.4.0, py-1.8.0, pluggy-0.9.0
cachedir: .tox/py36/.pytest_cache
rootdir: /Users/zayd/repos/pytest_bug, inifile: tox.ini
collected 0 items / 1 errors                                                                                                                                                                                                                    

==================================================================================================================== ERRORS =====================================================================================================================
_____________________________________________________________________________________________________ ERROR collecting stratego/printer.py ______________________________________________________________________________________________________
../../.pyenv/versions/3.6.5/Python.framework/Versions/3.6/lib/python3.6/doctest.py:933: in find
    self._find(tests, obj, name, module, source_lines, globs, {})
.tox/py36/lib/python3.6/site-packages/_pytest/doctest.py:406: in _find
    self, tests, obj, name, module, source_lines, globs, seen
../../.pyenv/versions/3.6.5/Python.framework/Versions/3.6/lib/python3.6/doctest.py:992: in _find
    if ((inspect.isroutine(inspect.unwrap(val))
.tox/py36/lib/python3.6/site-packages/_pytest/doctest.py:377: in _mock_aware_unwrap
    return real_unwrap(obj, stop=_is_mocked)
../../.pyenv/versions/3.6.5/Python.framework/Versions/3.6/lib/python3.6/inspect.py:512: in unwrap
    while _is_wrapper(func):
../../.pyenv/versions/3.6.5/Python.framework/Versions/3.6/lib/python3.6/inspect.py:506: in _is_wrapper
    return hasattr(f, '__wrapped__') and not stop(f)
E   KeyError: '__wrapped__'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 errors during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
============================================================================================================ 1 error in 0.25 seconds ============================================================================================================
ERROR: InvocationError for command /Users/zayd/repos/pytest_bug/.tox/py36/bin/pytest (exited with code 2)
____________________________________________________________________________________________________________________ summary ____________________________________________________________________________________________________________________
ERROR:   py36: commands failed
```

My apologies if this bug is obvious or I am doing something wrong.

Match evidence

Primary terms

KeyErrorinspect.unwrapsrc/_pytest/doctest.pypytest-dev/pytestKeyError: '__wrapped__' with from xxx import yyy_is_wrapper__wrapped___mock_aware_unwrap_is_mockedreal_unwrapDocTestFinder._findinspect.isroutine

Technical objective

Make pytest's doctest collection resilient to objects whose attribute access raises KeyError, so that importing such an object into a module under collection does not abort the test session.

Success condition

collecting a module that imports an object with an attribute hook that raises KeyError for unknown names proceeds normally instead of failing with KeyError: '__wrapped__' and Interrupted: 1 errors during collection; pytest's existing unwrap behaviour for mocked objects and for genuinely wrapped functions is unchanged, and real errors are still reported rather than swallowed.

Search fingerprints

  • Error signature: KeyError
  • Traceback path: src/_pytest/doctest.py
  • Repository: pytest-dev/pytest
  • Issue title: KeyError: '__wrapped__' with from xxx import yyy.
  • Symbols: inspect.unwrap, _is_wrapper, __wrapped__, _mock_aware_unwrap, _is_mocked, real_unwrap, DocTestFinder._find, inspect.isroutine.
  • Files: src/_pytest/doctest.py, _pytest/doctest.py (installed layout), stdlib doctest.py, stdlib inspect.py.
  • Verbatim error strings: E KeyError: '__wrapped__', Interrupted: 1 errors during collection, ERROR collecting stratego/printer.py.
  • Reproduction context: tox, from sty import fg, sty==1.0.0b9, package stratego, https://github.com/ZaydH/pytest_bug.
  • Versions quoted in the report: pytest 4.4.0, Python 3.6.5 & 3.7.1, MacOS Mojave 10.14.4, pluggy 0.9.0, py 1.8.0.

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