I like seeing the double line break after the import as per PEP 8, rarely see that around

The majority of the value from pythontutor can be found in IDE debugging tools by the way. Pycharms debugging tools are amazing. They don't map it out with arrows, but you can step through code line by line as it executes and see all values in memory and how they change, which helps immensely. Pythontutor is great though if you are using a lightweight IDE.

I was confused by this as well! The queue reads left-to-right and not right-to-left.

The front person in the queue (i.e. the first element in the array/list) proceeds to a till as soon as it becomes free.

I am not satisfied with this Kata because it uses big words like lexicographical. I have spoken.

Piotr, I just finished all of your coding meet up katas that are available in Python. I was looking to improve my skills with dictionaries and list comprehensions and this was a fantastic set of problems, all very well described and thought out.

Thank you for your work! I will definitely revisit for JavaScript.

I noticed you refactored quite a few times. If you don't mind me asking, what are you looking for when you iterate through your solution making changes?

Are there any general development rules to make it easier, or do you just sort of evaluate each piece of the code and think "can I golf this?"