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I'm trying to create something more like the command \SI{number}{units} of siunitx package but I have some trouble.

Starting with the answer of @Juanjo I'm arrived here:

\begin{sagesilent}
def SIsage(number,units=0):
    if units==0: 
        if number in ZZ or number.parent()==QQ:
            return r"\SI{"+ str(number) + "}"
        else:
            return r"\SI{"+ str(float(number)) + "}"
    else:
        if number in ZZ or number.parent()==QQ:
            return r"\SI{"+ str(number) + "}" +"{"+ units + "}"
        else:
            return r"\SI{"+ str(float(number)) + "}" +"{"+ units + "}"
\end{sagesilent}
\sagestr{SIsage(2442,"\kilo\metre\squared")}
\sagestr{SIsage(2442)}

and it works except when using \newton witch it become "ewton" problably cause to \n

After this I want to create a new custom LaTeX command that replace \SI{}{} but I have some trouble with non-default arguments. I didn't understand how them work. I want be able to use both of \SI{number}{units} that \SI{number} without units. Probably the best choise is to create two different commands(?)

\newcommand{\SIsage_units}[1]{,"#1"}
\newcommand{\SIsage_number}[1]{\sagestr{SIsage(#1}}
\newcommand{\SISAGE}[2]{\SIsage_number{#2}\SIsage_units{#1})} #doesn't work

The command I want:

\SISAGE{21}{\kilo\metre\squared}
 \SISAGE{26}{}

So my problems are:

1. how to avoid \n
2. how to set an unic custom command \SISAGE

Thanks everybody