Tue 2017-12-26 08:04:59 UTC, BDesco:
> Sorry for my late reply. Thanks for your help.
> unhold works fine but I could not find any documentation on it.
You can get the documentation of .unhold by using ".unhold?":
sage: k, n = SR.var('k n')
sage: s = sum(n^5, n, 0, k, hold=True)
sage: s
sum(n^5, n, 0, k)
sage: s.unhold()
1/6*k^6 + 1/2*k^5 + 5/12*k^4 - 1/12*k^2
sage: s.unhold?
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