i think i'm not doing the right track. so what is the best way to modify 
> the dict variable value in the list?
> e.g.
> [dict(a = 0, b = 1), dict(a = 1, b = 2)]
> i want to modify a = 0 into a = 9 in the first data row.
>

Did you try

>>> thelist[0]["a"] = 9

?

Why are you calling clear() as a method of a value stored in session? What 
is the intended result?

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