Command like DedekindEta for Sage In Mathematica we have the command DedekindEta for computing values of the Dedekind eta function. 

Is there an equivalent command for Sage or Maple?
I believe that this reference manual section may be what you're looking for, and in particular (as a modular form, I guess) the function you seek seems to be here, roughly.
I believe that this reference manual section may be what you're looking for, and in particular (as a modular form, I guess) the function you seek seems to be here, roughly.