Consider this small and simple datasepoints $=$ pd$.$DataFrame$($

$[[1,1],[2,1],[3,3],[6,5],[7,7],[7,6]],$

columns$=["$X$","$y$"]$

$)$

base $=$ alt.Chart$($points$).$mark$\_$point$().$encode$($

x$=\text{'}$X$\text{'},$

y$=\text{'}$y$\text{'}$

$)$

base