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Define score as follows:

def score(x, ncand=10):
    s = piecewise([([i,i], ncand - i) for i in range(ncand)])
    return s(x)

Then you can use score as in the following examples:

sage: score(7)
3
sage: score(3, ncand=7)
4
sage: score(3,7)
4

Observe that, if omitted, the value of ncand is 10.