Problem

Looking at#25796 and#26854, it might be helpful to be able to independently set the different parts of sketch and not just as a tuple. This is motivated by wanting to makeplt.xkcd discouraged and wanting the cleanest alternative for passing in the sketch params.

Proposed solution

#25796 moves in this direction by allowing both

mpl.rcParams['path.sketch']= (scale,length,randomness,seed)mpl.rcParams[`path.sketch_seed']=seed

and if we're OK w/ the other parameters getting their own rcParams then they can have a unified naming scheme. Alternatively, we can probably do the parsing soNone = default but I don't like having to remember which position is which param.