AttributeError: 'tuple' object has no attribute 'sort'

Python
1

Code in Free Course, " opencv-python-free-course-code", produces error as follows:

AttributeError Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_15804/465439247.py in
4
5 # Sort matches by score
----> 6 matches.sort(key=lambda x: x.distance, reverse=False)
7
8 # Remove not so good matches

AttributeError: ‘tuple’ object has no attribute ‘sort’

Need help resolving.

2

Code in Free Course, " opencv-python-free-course-code", produces error

can you link us to the resp. source code ?
there was indeed some recent python api change,
where lists (e.g. of DMatch) got changed to tuples

maybe a simple:

list(matches).sort(key=lambda x: x.distance, reverse=False)

does it already ?

3

I’d recommend

matches = sorted(matches, key=lambda x: x.distance)

because list(matches).sort() creates a list object without a variable referencing it, and the sort() returns nothing

4

This worked. Thanks for your help.

5

Thanks for your response. This seemed to function, i.e. no error, but the resultant Match keypoints were all over the place. This gave the right results :

matches = sorted(matches, key=lambda x: x.distance)