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Fri Oct 24 08:37:38 EDT 2003 · https://mail.python.org/pipermail/python-dev/2003-October/039430.html

    Tim>     squares = (f(x)**2 for x in inputs)  # assuming reiterability here

    Tim>     for f in math.sin, math.cos, math.tan:
    Tim>         plot(squares)

How much more expensive would this be than

    for f in math.sin, math.cos, math.tan:
        squares = (f(x)**2 for x in inputs)
        plot(squares)

which would work without reiterability, right?  The underlying generator
function could still be created at compile-time and it (or its code object?)
stored in the current function's constants.  'f' is simply an argument to it
when the iterator is instantiated.

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[Python-Dev] accumulator display syntax