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As we all know (or, at least, as I've been trying to tell everyone,) generators in Python are an extremely powerful API design technique. A generator represents the linear decomposition of a single computation into multiple parts, and such decomposition proves very useful in practice. For example, we can model an infinite computation and only execute the portions we desire. Very similarly, we can simplify APIs that specify when a computation terminates, by modeling these computations as infinite sequences of steps, and allowing the enduser to directly control which steps are peformed. We can even interleave the parts of multiple, distinct computations (though in Python ≥3.6, this is better done with the custom async and await syntax and associated protocols.)
A generatorcoroutine offers us an alternative formulation for a state machine, but one which represents state and transitions implicitly in the form of (linearised) source text—in order words, a state machine that we can read and understand like any other regular code (and where we have arbitrary control over dataflow.)
But, in practice, the principles which support the use of generators (e.g., as iteration helpers,) often contrast with the code we get when we model with generatorcoroutines, and a number of practical issues arise. While these issues may be surmountable (with enough effort and enough contortion,) the question remains: are generatorcoroutines really the answer?

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