This application failed to start because no Qt platform plugin could be initialized

Question

I am new to programming and I am stuck trying to run a very simple Python script, getting this error:

qt.qpa.plugin: Could not find the Qt platform plugin "cocoa" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

zsh: abort      python3 mypuppy1.py

The script code is:

import cv2
img = cv2.imread('00-puppy.jpg')
while True:
    cv2.imshow('Puppy',img)
    if cv2.waitKey(1) & 0xFF == 27:
        break
cv2.destroyAllWindows()

However this Notebook code works in JupyterLab:

import cv2
img = cv2.imread('00-puppy.jpg')
cv2.imshow('Puppy', img)
cv2.waitKey()

I am on macOS, using Anaconda and JupyterLab.

I have tried googling the issue but either I couldn't implement the solutions right or they just do not work for me as most of them are for Windows' users.

I would appreciate any help with this issue. Thanks!

Answer 1

Try installing

pip3 install opencv-python==4.1.2.30  

Answer 2

For Ubuntu users,

sudo apt-get install qt5-default fixes the issue.

(I'm using OpenCV 4.4)