[Python] Something wrong occurred when I import cv2

How this occurred: I wrote import cv2 in jupyter notebook code cell and run,then ImportError occurred.

What I have tried: I have tried to uninstall opencv-python and opencv-contrib-python and reinstall opencv-python, but it didn't work.

Detailed Error:

ImportError Traceback (most recent call last)
<ipython-input-1-7660ed0d4d71> in <module>
----> 1 import cv2
2 import numpy as np
3 import os
4 from matplotlib import pyplot as plt
5 import time

D:\Anaconda3\lib\site-packages\cv2\__init__.py in <module>
7
8 from .cv2 import *
----> 9 from .cv2 import _registerMatType
10 from . import mat_wrapper
11 from . import gapi

ImportError: cannot import name '_registerMatType' from 'cv2.cv2' (D:\Anaconda3\lib\site-packages\cv2\cv2.cp38-win_amd64.pyd)

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