Python Brain Teasers: Teaser 3 wrong answer

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For every minor version of Python 3 I can run the code against quickly this code prints 6.

❯ for minor in `seq 2 8`; do; echo "Python 3.$minor"
docker run -it python:3.$minor python -c "print(len('Kraków'))"
done
Python 3.2
6
Python 3.3
6
Python 3.4
6
Python 3.5
6
Python 3.6
6
Python 3.7
6
Python 3.8
6

Python 2.7 the answer is 7.
Am I doing something unexpected?

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