There are [1, 2], and AFAICT they rely on gnuplot [3].
[1] https://github.com/nschloe/termplotlib [2] https://github.com/dkogan/gnuplotlib [3] http://www.gnuplot.info/
[1] https://github.com/nschloe/termplotlib [2] https://github.com/dkogan/gnuplotlib [3] http://www.gnuplot.info/
Now it's included by default IIRC