For those who may get stuck on this kind of things in the future:
This works fine:
session.execute("SELECT * ,(CASE WHEN Mytable.ColC = :i THEN :i WHEN
Mytable.ColC > :i THEN CAST(Mytable.ColB AS FLOAT) / Mytable.ColC END)
AS Calcul FROM Mytable ORDER BY Calcul", {'i':0})

Thanks
Dominique
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