Best practice to simulate exception for no space left on disk in Python with OpenCV

Question

I am currently writing a wrapper class for OpenCVs implementation of capturing images with a webcam. I want to catch the error exception when the space on disk is full. The code for it would look like the following:

cap = cv2.VideoCapture(cam_idx)
ret, frame = cap.retrieve()


try:
 cv2.imwrite('test.png',frame)
except IOError:
 print("ERROR ON WRITING")

While this will catch the exception, I was wondering if this will also catch other Exceptions and how to only catch the exception for disk full, and what would be the best practice for making a test for this code snippet (besides filling up my disk with so much stuff that the hard drive is really full)

Answer 1

Use OSError and check a result for errno.ENOSPC:

    except OSError as e:
        if e.errno == errno.ENOSPC:

To check free disk space you can use:

psutil.disk_usage(path).free