A configuration problem of OpenCV4

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I built the OpenCV4 by Cmake and installed the opecv4.0 using anaconda3 with its python 3.7 verison. My platform is Ubuntu 18.04 LTS. However, when testing the installation, I encounter the following problem:

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>>> import cv2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/user/anaconda3/lib/python3.7/site-packages/cv2/__init__.py", line 89, in <module>
    bootstrap()
  File "/home/user/anaconda3/lib/python3.7/site-packages/cv2/__init__.py", line 62, in bootstrap
    ], True)
  File "/home/user/anaconda3/lib/python3.7/site-packages/cv2/__init__.py", line 56, in load_first_config
    raise ImportError('OpenCV loader: missing configuration file: {}. Check OpenCV installation.'.format(fnames))
ImportError: OpenCV loader: missing configuration file: ['config-3.7.py', 'config-3.py']. Check OpenCV installation.
>>>

I typed the command:

echo $PYTHONPATH

I get:

/home/user/anaconda3/lib/python3.7/site-packages

Updated:

I found that the /home/user/anaconda3/lib/python3.7/site-packages/cv2/ does not contain the config-3.7.py, but it contains config-3.6.py. At the beginning, I ensured that all python3 are correlated to the anaconda's python 3.7 library. I don't know why the cv2 folder still uses the Ubuntu's default python.

I have tried deleting the cv2 folder and rebuild it again, but it still generates the config-3.6.py file. I don't know why it will like this.

By the way, I didn't turn on the opencv python3 verison in Cmake config of building OpenCV, will it be affected?

Please help. Thanks

A part of Cmake is here:

After modifying the Cmake config following the instruction from and removing python2 related setting , I clear the build folder and rebuilt again. I did pip3 install --upgrade, but the cv2 folder still contain the config-3.6.py.

Second update:

I have upgraded the Ubuntu's Python from 3.6 to 3.7 according to this tutorial ((http://ubuntuhandbook.org/index.php/2019/02/install-python-3-7-ubuntu-18-04/)) and run this command "sudo apt-get install python3.7-dev" . The above errors disappear and the command "import cv2" can run now. But I find some special pointing locations when installing OpenCV4.1. The python3 library used is User's library instead of Anaconda's.

--   Python 2:
--     Interpreter:                 (ver 2.7.15)
--     Libraries:                   NO
--     numpy:                       NO (Python wrappers can not be generated)
--     install path:                -
-- 
--   Python 3:
--     Interpreter:                 /home/user/anaconda3/bin/python3.7m (ver 3.7.5)
--     Libraries:                   /usr/lib/x86_64-linux-gnu/libpython3.7m.so (ver 3.7.5)
--     numpy:                       /home/user/anaconda3/lib/python3.7/site-packages/numpy/core/include (ver )
--     install path:                /home/user/anaconda3/lib/python3.7/site-packages/cv2/python-3.7
-- 
--   Python (for build):            /home/user/anaconda3/bin/python3.7m