Mastery of Python, in my opinion, is mastering "Pythonic" code, which incorporates readability as a fundamental tenet. In addition, the gigantic universe of not only the standard library but also numerous external libraries and tools, of which a master can leverage to undertake tasks both rapidly and efficiently.

So, to me, a Python zen master would not write incomprehensible code, but instead write readable code very quickly that effectively and efficiently solved the problem they are facing due to their comfort working inside the Python ecosystem.