module 'cv2.dnn' has no attribute 'DictValue'

[thepowerfuldeez]

Hi! I've come to an issue with the latest opencv (4.8.0.76)
I think you've changed functionality which is now not backward compatible

Full traceback:

    import cv2
  File "/usr/local/lib/python3.8/dist-packages/cv2/__init__.py", line 181, in <module>
    bootstrap()
  File "/usr/local/lib/python3.8/dist-packages/cv2/__init__.py", line 175, in bootstrap
    if __load_extra_py_code_for_module("cv2", submodule, DEBUG):
  File "/usr/local/lib/python3.8/dist-packages/cv2/__init__.py", line 28, in __load_extra_py_code_for_module
    py_module = importlib.import_module(module_name)
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/usr/local/lib/python3.8/dist-packages/cv2/typing/__init__.py", line 169, in <module>
    LayerId = cv2.dnn.DictValue
AttributeError: module 'cv2.dnn' has no attribute 'DictValue'```

Python=3.7

[asmorkalov]

DictValue class type is defined in cv2/dnn/__init__.pyi:60 and works with interpreter:

>>> q = cv2.dnn.DictValue(0)
>>> print(q)
< cv2.dnn.DictValue 0x7fefca480fd0>

Tested with Ubuntu, python 3.8 and opencv-python 4.8.0.76 from pip.

[VadimLevin]

Can't reproduce

Python 3.11.4 (main, Jun 20 2023, 16:51:49) [Clang 14.0.0 (clang-1400.0.29.202)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> import cv2.typing
>>> cv2.typing.LayerId is cv2.dnn.DictValue
True
>>> import platform
>>> platform.platform()
'macOS-12.6.3-x86_64-i386-64bit'
>>> cv2.__version__
'4.8.0'

[caoandong]

Can confirm that this issue happens in the latest release by simply running import cv2.

The previous version opencv-python==4.8.0.74 works fine,.

Maybe it has something to do with the way import work?

[VadimLevin]

@caoandong

Can you confirm that you observe an issue in a clean virtual environment?

python3 -m venv venv
source venv/bin/activate
pip install opencv-python==4.8.0.76
python
>>> import platform
>>> platform.platform()
'macOS-12.6.3-x86_64-i386-64bit'
>>> import cv2
>>> cv2.__version__
'4.8.0'

[caoandong]

OK yeah installing from the clean virtual env solves the problem.

I think the issue has something to do with pip uninstall opencv-python not uninstalling the previously installed version.

After searching and removing all previous installed versions of cv2 and reinstalling opencv-python it works.

[thepowerfuldeez]

Thank you! That should solve the problem

[alrafiabdullah]

I faced this issue while using YOLOV8. For my case, the docker container had opencv-python & opencv-python-headless installed (both old versions). I uninstalled them using pip and then installed opencv-python==4.8.0.74.

[lyheiyu]

For mac
source activate 'your env'
You can use a lower opencv version
pip install opencv-python==4.5.0XXX

[K-Ashik]

opencv-python==4.5.64 has solved the problems for me in macbook m1 slicon