No type hints for cv2.createTrackbar function in 4.8.0.74

[slooi]

I just want to give people a heads up that the cv.createTrackbar function is not covered by type hints in the latest version 4.8.0.74.

Solution

I just use an older version like so:
pip install opencv-python==4.7.0.72

[slooi]

Also was it removed for a particular reason? The other trackbar methods like:

cv.getTrackbarPos
cv.setTrackbarMax
cv.setTrackbarMin

still exist

[asmorkalov]

Sounds strange. The function is there in Linux package:

alexander@paradox:~/Projects/OpenCV$ python3.8 -m pip install opencv-python
Defaulting to user installation because normal site-packages is not writeable
Looking in indexes: https://pypi.org/simple, https://pypi.ngc.nvidia.com
Collecting opencv-python
  Downloading opencv_python-4.8.0.74-cp37-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (61.7 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 61.7/61.7 MB 1.5 MB/s eta 0:00:00
Requirement already satisfied: numpy>=1.17.0 in /home/alexander/.local/lib/python3.8/site-packages (from opencv-python) (1.24.3)
Installing collected packages: opencv-python
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
depthai-sdk 1.1.8 requires opencv-contrib-python>4, which is not installed.
Successfully installed opencv-python-4.8.0.74

[notice] A new release of pip is available: 23.1.2 -> 23.2.1
[notice] To update, run: python3.8 -m pip install --upgrade pip
alexander@paradox:~/Projects/OpenCV$ python3.8
Python 3.8.0 (default, Dec  9 2021, 17:53:27) 
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.createTrackbar
<built-in function createTrackbar>
>>>

[asmorkalov]

Could you add more details: platform, how the package was installed / built, etc.

[slooi]

It seems like I was mistaken. cv2.createTrackbar does indeed exist, but the function signature type hint for it was missing from the .pyi file.
I am using windows 10. I used pip to install the package: pip install opencv-python.

[asmorkalov]

Ok, confirmed. Looks like the same issue is relevant to all highgui functions with callback as parameters, e.g. mouse handlers.

[asmorkalov]

List of candidates: https://github.com/opencv/opencv/blob/4.x/modules/python/src2/cv2_highgui.hpp