PythonCheatsheet
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 A key theme in this book, hidden among the fancy patterns, is that we can use
 simple abstractions to hide messy details. When we're writing code for fun, or
 in a kata,footnote:[A code kata is a small, contained programming challenge often
-used to practice TDD. See https://oreil.ly/vhjju["Kata—The Only Way to Learn TDD"] by Peter Provost.]
+used to practice TDD. See
+https://web.archive.org/web/20221024055359/http://www.peterprovost.org/blog/2012/05/02/kata-the-only-way-to-learn-tdd/["Kata—The Only Way to Learn TDD"] by Peter Provost.]
 we get to play with ideas freely, hammering things out and refactoring
 aggressively. In a large-scale system, though, we become constrained by the
 decisions made elsewhere in the system.