If you use third party Python libraries, the end user is going to have to install them too. Python really isn't a great language to be building consumer distributed command line apps in.
I think a lot of this discussion is focused around custom software or backend software, but for a publicly distributed binary, Go or any other compiled language is much better than Ruby or Python (and especially Javascript).
Go might be a special case actually, as it was designed to be a "boring" language to reduce the cost of technology choice. But it is completely interchangeable with similar programming languages (like Python) so evaluating the cost of it vs something else is still a very reasonable thing to do.
I think a lot of this discussion is focused around custom software or backend software, but for a publicly distributed binary, Go or any other compiled language is much better than Ruby or Python (and especially Javascript).