Terry J. Reedy added the comment:
I am arguing that (x)range *should* be usable for large numbers of options
*because* the containment test is O(1). What happens is you *do* use xrange
instead of range in 2.7 or 3.x instead of 2.7?
In 2.x, range(n) *is* a list so that is a bad choice for large n, regardless of
the display issue, which could be fixed separately as is being done on other
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