PyLint not recognizing cv2 members

问题:

I am running pylint on an opencv project and I am getting many pylint errors in VS code about members not being present.

Example code:

import cv2
cv2.imshow(....)

Errors obtained:

However , the code runs correctly without any errors.

Versions : pylint 1.8.1 , astroid 1.6.0

回答1:

This is from pylint. You can generate a pylint config file in the root of your project with this command: (I find this to be helpful if you work in a team or on different computers from the same repo)

pylint --generate-rcfile > .pylintrc

At the beginning of the generated .pylintrc file you will see

# A comma-separated list of package or module names from where C extensions may
# be loaded. Extensions are loading into the active Python interpreter and may
# run arbitrary code.
extension-pkg-whitelist=

Add cv2 so you end up with

# A comma-separated list of package or module names from where C extensions may
# be loaded. Extensions are loading into the active Python interpreter and may
# run arbitrary code.
extension-pkg-whitelist=cv2

Save the file. The lint errors should disappear.

回答2:

Yes it is because the extension has not been installed. Set this: extension-pkg-whitelist=cv2 and you're good to go. However it may not detect the functions or modules implemented in cv2

回答3:

Here the code snippet for the settings.json file in MS V Code

"python.linting.pylintArgs":["--extension-pkg-whitelist=cv2"]

回答4:

1. On VScode: CTRL + Shift + P
2. Choose "Preferences: Open Settings (JSON)"
3. Add this line into JSON file: "python.linting.pylintArgs": ["--generate-members"]

Done, it works for me

Note: Make sure you choose "Preferences: Open Settings (JSON)", not "Preferences: Open Default Settings (JSON)"

Setting File would look like

{
"workbench.iconTheme": "vscode-icons",
"python.dataScience.sendSelectionToInteractiveWindow": true,
"kite.showWelcomeNotificationOnStartup": false,
"python.dataScience.askForKernelRestart": false,
"python.dataScience.jupyterServerURI": "local",
"python.pythonPath": "/usr/bin/python3",
"workbench.colorTheme": "Monokai",
"vsicons.dontShowNewVersionMessage": true,
"python.linting.pylintArgs": ["--generate-members"] }

回答5:

I used below config settings in settings.json of vscode and it helped me avoid the unessential flags by pylint, and also got intellisense for cv2 working, it it doesn't work try uninstalling and deleting cv2 packages from C:\Anaconda3\envs\demo1\Lib\site-packages folder, and reinstalling opencv-python package

{
"python.linting.pylintEnabled": true,
  "python.linting.enabled": true,
  "python.linting.pylintArgs": [
    "--extension-pkg-whitelist=cv2"
  ]
}