[Corso Python3] però quel che scrive qui è assai corretto:

[alessandro medici]

This leads to a general idea that you should keep in mind whenever you are
coding bidirectional transformation functions between two formats, where
the functions are inverses of each other. When one of the directions has a
more clearly specified transformation algorithm, you can verify the
function that implements the more loosely specified transformation by
checking that the other function does indeed result in the original input
value when applied to the candidate result. If only the canonical form is
to be accepted, this pattern lets you easily reject plausible but
noncanonical inputs that it might otherwise be difficult to detect.
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