[bugfix] Fix sanity function print to accept a single object only
#1698
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I came up to this when preparing the tutorials. Currently you can't write
sn.assert_found('r'something', sn.print(self.stdout)), becausesn.print()would return you a tuple, which you would need to unpack. But if you try to unpack, you trigger the evaluation of the deferred expression, which you don't want. So the sanity version of theprintis restricted to getting a single object only.