|   | 1 |  initial version  | 
Sympy can do that one as follows:
sage: import sympy
sage: hs=H._sympy_()
sage: sympy.laplace_transform(hs,t,s)
(1/s, 0, True)
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                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.