OK r4566 of trunk also allows text() within select_from(), so you can
use textual bind params (denoted by a colon ':'):
generate_series = text("generate_series(:x, :y, :z) as s(a)")
s = select([(func.current_date() +
literal_column("s.a")).label("dates")]).select_from(generate_series)
# load up some parameters:
s = s.params(x=5, y=6, z=7)
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