[Python-ideas] Generator unpacking

[Stephen J. Turnbull]

Andrew Barnert via Python-ideas writes:

 > But that isn't a problem; we're not trying to come up with a
 > definition that could be used to write type-theoretic behavior
 > proofs for Python semantics, but something that's useful in
 > practice for discussing almost all real Python programs with other
 > humans.

Are there really places where we *want* "foo(range(n))" to raise but
"foo(iter(range(n)))" to do something useful?  In other words, is this
really a terminology problem, rather than a problem with the design of
APIs that take iterators rather than iterables?