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This is not an answer but a workaround in the case that one wishes a standalone picture.

Instead of ascii_art(t) execute pretty_print(t). Then edit the TeX code like this:

• Replace commands of the type

  \newcommand{\nodec}{\node[draw,circle] (c) {\$None\$} by

  \newcommand{\nodeb}{\node[draw,rectangle] (c) {$$}

• Replace commands of the type

  \newcommand{\nodei}{\node[draw,circle] (i) {\$6\$} by

  \newcommand{\nodei}{\node[fill=black,draw,circle] (i) {$$}

• Replace

  \matrix[column sep=.3cm, row sep=.3cm,ampersand replacement=\&] by

  \matrix[row sep=0.7cm,ampersand replacement=\&]

• Replace

  \path[ultra thick, red] by

  \path[black]

This will replace the tree in Sage style

by a tree in Knuth style:

This is not an answer but a workaround in the case that one wishes a standalone picture.

Instead of ascii_art(t) execute pretty_print(t). Then edit the TeX code like this:

• Replace commands of the type

  \newcommand{\nodec}{\node[draw,circle] (c) {\$None\$} by

  \newcommand{\nodeb}{\node[draw,rectangle] (c) {$$}

• Replace commands of the type

  \newcommand{\nodei}{\node[draw,circle] (i) {\$6\$} by

  \newcommand{\nodei}{\node[fill=black,draw,circle] (i) {$$}

• Replace

  \matrix[column sep=.3cm, row sep=.3cm,ampersand replacement=\&] by

  \matrix[row sep=0.7cm,ampersand replacement=\&]

• Replace

  \path[ultra thick, red] by

  \path[black]

This will replace the tree in Sage style

by a tree in Knuth style: