Why is Pylint telling me 'module cv2 has no member'?

Question

I keep getting pylint errors saying:

module 'cv2' has no "something" member

and my cv2 module doesn't work.

I'm clueless as to why; as far as I know I installed it correctly. I even uninstalled and reinstalled about 20 times.

When i print out the modules i have in my python lib cv2 is printed; its functions are printed correctly. I'm using python 3.6.6 and don't have another version of python installed.

For example, this code will print: "the images are the same" no matter what images I'm giving it, as the 2 images will always be equal to "None".

import cv2
import numpy as np

image1 = cv2.imread("1.jpg")
image2 = cv2.imread("2.jpg")

difference = cv2.subtract(image1, image2)

result = not np.any(difference) #if difference is all zeros it will return False

if result is True:
    print ("The images are the same")
else:
    cv2.imwrite("result.jpg", difference)
    print ("the images are different")

Anyone know whats going on?

Solution 1

If you don't want to add more config, please add this code to your config file, instead of 'whitelist'.

{
"python.linting.pylintArgs": ["--generate-members"],
}

relevent question: how-do-i-get-pylint-to-recognize-numpy-member

Solution 2

I had the same problem. My setup is Python 3.6.6 64 bit AMD My IDE is Visual Studio Code 1.46.1

My research led me to https://answers.opencv.org/question/200869/e1101module-cv2-has-no-imread-member/. One of the comments on the page linked above says to replace your import statement with one of this format:

from cv2 import cv2

Save your changes and allow your linter to reload. Viola! The error disappears.

Please mark as answer if this helps (I know it's been a while this question was asked).

Cheers.

Comments

[krflol]

cv2\cv2 doesn't exist. cv2\data does, hence why the linting should reveal cv2.haarcascades, as it is in the data_init_.py

[Admin]

so should i move the init.py? if so where?

[Admin]

i have 2 init.py for some reason one in Python\Python36\Lib\site-packages\cv2 and one in Python\Python36\Lib\site-packages\cv2\data

[krflol]

Let me clarify, your code works when it runs but the linting doesn't?

[Admin]

linting gives an error even tho the module exist as it is in the lib folder, even more advanced tools to print out my python modules did print out the cv2 module and even printing the modules functions was successful and correct, but the module itself doesnt work properly as using the modules functions simply doesnt work as it should

[krflol]

"Doesn't work as it should" at runtime? Are you getting an actual exception when you run the script?

[Admin]

print(image1)=None same for image2 and diffrence result in undefined error only if i print it tho, so running the code as is will just print "images are the same"

[krflol]

Thats a different question, but probably a much better image comparison tutorial can be found here.pyimagesearch.com/2017/06/19/…

[Admin]

as i already stated, this code is copy pasted from an image comparison tutorial, its all purpose is to add some information on the problem, plz stick to the problem stated in the question, thank u. btw atm the 2 images are equal to "None" as "imread" isnt recognized

[Dave W. Smith]

If imread isn't recognized, that code will explode, not return None. If cv.imread() is returning None, then check your filenames/paths. And your questions reads as if you're asking about two problems.

[Admin]

What ways are u suggesting for doing so? i tried a few and they all came correct

[Dave W. Smith]

I suggest checking the im1 and im2 aren't None, and reporting those as "file not found". If both fail to read, cv2.subtract(None, None) will give you None, and np.any(None) likewise returns None. not None is True, causing that code to always report "Images are the same" if both images fail to read.

[ScipioAfricanus]

is there something I can do in pylintrc to add this?

[serwus]

Both import cv2 and from cv2 import cv2 worked, but only the latter prevented my IDE from underlining every cv2 in the code.

[duff18]

as stated by A. J. Paul in an answer below you need to set generated-members=cv2 in your .pylintrc file

[bers]

This answer is not only wrong, it breaks pylint.