这个问题与“如何通过Conda安装Python OpenCV？”不同，因为这个问题是在5年多前提出的，当时所有的软件包都有不同的版本。我尝试了这个问题的所有答案，都没有成功。有关详细信息，请参阅问题的文本。
如何在2019年7月现在使用conda安装opencv？在新安装的anaconda上，我做了conda update conda（成功），然后尝试了以下操作：

(base) C:\Users\mlearning>python
Python 3.7.3 (default, Mar 27 2019, 17:13:21) [MSC v.1915 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'cv2'
>>> import cv
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'cv'

(base) C:\Users\mlearning>conda install -c menpo opencv3
Collecting package metadata (repodata.json): done
Solving environment: (goes into infinite loop, after 10 minutes I pressed ^C)

(base) C:\Users\mlearning>conda install opencv
Collecting package metadata (repodata.json): done
Solving environment: failed
Initial quick solve with frozen env failed.  Unfreezing env and trying again.
Solving environment: failed

UnsatisfiableError: The following specifications were found to be incompatible with each other:

Package zipp conflicts for:
importlib_metadata -> zipp[version='>=0.3.2']
path.py -> importlib_metadata[version='>=0.5'] -> zipp[version='>=0.3.2']
anaconda==2019.03=py37_0 -> importlib_metadata==0.8=py37_0 -> zipp[version='>=0.3.2']
zipp
Package importlib_metadata conflicts for:
anaconda==2019.03=py37_0 -> importlib_metadata==0.8=py37_0
path.py -> importlib_metadata[version='>=0.5']
Package hdf5 conflicts for:
anaconda==2019.03=py37_0 -> h5py==2.9.0=py37h5e291fa_0 -> hdf5[version='>=1.10.4,<1.10.5.0a0']
hdf5
opencv -> hdf5[version='>=1.10.2,<1.10.3.0a0,>=1.8.18,<1.8.19.0a0,>=1.8.20,<1.9.0a0']
h5py -> hdf5[version='>=1.10.1,<1.10.2.0a0,>=1.10.2,<1.10.3.0a0,>=1.10.4,<1.10.5.0a0,>=1.8.18,<1.9.0a0']
pytables -> hdf5[version='>=1.10.1,<1.10.2.0a0,>=1.8.18,<1.8.19.0a0,>=1.8.18,<1.9.0a0']
Package mkl-service conflicts for:
mkl-service
anaconda==2019.03=py37_0 -> mkl-service==1.1.2=py37hb782905_5

(base) C:\Users\mlearning>conda install -c conda-forge opencv
Collecting package metadata (repodata.json): done
Solving environment: failed
Initial quick solve with frozen env failed.  Unfreezing env and trying again.
Solving environment: failed

UnsatisfiableError: The following specifications were found to be incompatible with each other:

Package hdf5 conflicts for:
anaconda==2019.03=py37_0 -> hdf5==1.10.4=h7ebc959_0
h5py -> hdf5[version='1.10.1,1.8.17|1.8.17.*,1.8.18|1.8.18.*,>=1.10.2,<1.10.3.0a0,>=1.10.3,<1.10.4.0a0,>=1.8.20,<1.9.0a0']
pytables -> hdf5[version='1.8.18|1.8.18.*,>=1.10.4,<1.10.5.0a0,>=1.8.18,<1.8.19.0a0,>=1.8.18,<1.9.0a0']
hdf5
Package mkl-service conflicts for:
mkl-service
Package importlib_metadata conflicts for:
importlib_metadata
path.py -> importlib_metadata[version='>=0.5']