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Note that in the question you reference, the show() functions are not in the same line as the print statements. The return value of show is what would go in the print statement, but what you want is what the show function does, which depends on whether you are in a notebook, etc. Embedded in a print statement I wouldn't know what to expect in general.

See this example in the Sage cell server to see what I mean:

a = 1
print a
print show(latex(a))
show(latex(a))

Note that this one does seem to do something for the print, but probably this depends on the frontend. Also notice the None printed at the end - that is what show returns.

Note that in the question you reference, the show() functions are not in the same line as the print statements. The return value of show is what would go in the print statement, but what you want is what the show function does, which depends on whether you are in a notebook, etc. Embedded in a print statement I wouldn't know what to expect in general.

See this example in the Sage cell server to see what I mean:

a = 1
print a
print show(latex(a))
show(latex(a))

Note that this one does seem to do something for the print, but probably this depends on the frontend. Also notice the None printed at the end - that is what show returns.

a = matrix(2,[1,2,3,4])
pretty_print(html("This is the matrix $%s$"%(latex(a))))