There has to be some concession to Python syntax. The initial attempt was clever ... an odd feature to examine the interpreter’s tree structure for the code and then modify it.

Finally, Python has another data structure, the set, which superficially resembles a dictionary. Think of it as a dictionary with only keys, but no values. Its syntax is also similar to a ...

Python, for all its power and popularity, has long lacked a form of flow control found in other languages—a way to take a value and match it elegantly against one of a number of possible conditions.