Pycharm configuring opencv Library

The detour I took ： For just started OpenCV Little white of , First contact again pycharm compiler . So in configuration opencv There are many problems in Library .

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as follows ：

• 1、 If you are directly in Terminal Run interface input 【pip install opencv-python】, Because this visit is foreign , So the download speed is very slow , Finally, it will be saved . But the mirror image of Tsinghua is noted later , It will speed up the download ：【pip3 install opencv-python -i https://pypi.tuna.tsinghua.edu.cn/simple】. The same principle can be used to add libraries later
  Of course ： I try this , still import cv2 Report errors
• 2、 In the most old-fashioned way ：【file->settings->Project->Python Interpreter->+ -> Search for opencv-python->Inatsll Package】 Then there was the long wait …
  Again ： I try this , still import cv2 Report errors
• 3、 This time I listen to my classmates' suggestions , Recreate project , Then check all that should be checked . next , Repeat step 2.
  Again ： I try this , still import cv2 Report errors
• wait .....

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Successfully solved ： Last , I use the following method to solve

• 1、 First ： hold Python Interpreter Replace the mirror image inside with Tsinghua
  
• 2、 Then proceed as follows （ Refer to other big guys ）
  
  
  Import... Again ：
  
  complete ：
  

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test ：

import cv2 as cv
src=cv.imread("E:\\Pec\\12.jpg")
cv.namedWindow("input image")
cv.imshow("input image",src)
cv.waitKey(0)
cv.destroyAllWindows()
print(" Successfully printed ")