Code Readability First!#
Code readability is a matter of respect. As the author of your code you can make reading it more pleasant for your fellow programmers. This even applies to yourself in 3 months time. See also https://blog.codinghorror.com/coding-for-violent-psychopaths/.
Code readability is a matter of efficiency, as code is generally read more often than it is written. To quote The Zen of Python by Tim Peters:
Readability counts.
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