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1. Inspect First

Printing out the value of cv2.__version__ first before assigning it.

By doing so in my machine, I got the value

3.3.0-dev

From here you can tell that you actually need three variables instead of four hence

major_version, minor_version, type = cv2.__version__.split('.')

should work just fine.

2. Dynamic

In the event that you do not have the luxury of doing a quick check of your results, you can refer back to native Python APIs.

result = cv2.__version__.split('.')

split() returns a list consisting of the substrings.

From here, result consists of

['3', '3', '0-dev']

Example usage of split()