Draw treemap with hatch patterns in vanilla matplotlib + python3. It can be easily modified to use colors instead of hatches.

1-demo_5_3_5_4_5_2_2_3_3_2_2_3_3_3_2.svg

2-demo_500_156_301.svg

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
  "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<!-- Created with matplotlib (https://matplotlib.org/) -->
<svg height="345.6pt" version="1.1" viewBox="0 0 460.8 345.6" width="460.8pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
 <metadata>
  <rdf:RDF xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
   <cc:Work>
    <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/>
    <dc:date>2021-06-10T19:23:32.758187</dc:date>
    <dc:format>image/svg+xml</dc:format>
    <dc:creator>
     <cc:Agent>
      <dc:title>Matplotlib v3.3.3, https://matplotlib.org/</dc:title>
     </cc:Agent>
    </dc:creator>
   </cc:Work>
  </rdf:RDF>
 </metadata>
 <defs>
  <style type="text/css">*{stroke-linecap:butt;stroke-linejoin:round;}</style>
 </defs>
 <g id="figure_1">
  <g id="patch_1">
   <path d="M 0 345.6 
L 460.8 345.6 
L 460.8 0 
L 0 0 
z
" style="fill:#ffffff;"/>
  </g>
  <g id="axes_1">
   <g id="patch_2">
    <path d="M 57.6 345.6 
L 403.2 345.6 
L 403.2 0 
L 57.6 0 
z
" style="fill:#ffffff;"/>
   </g>
   <g id="patch_3">
    <path clip-path="url(#p41b2d4575b)" d="M 57.6 345.6 
L 403.2 345.6 
L 403.2 0 
L 57.6 0 
z
" style="fill:none;stroke:#000000;stroke-linejoin:miter;"/>
   </g>
   <g id="patch_4">
    <path clip-path="url(#p41b2d4575b)" d="M 57.6 345.6 
L 238.164263 345.6 
L 238.164263 0 
L 57.6 0 
z
" style="fill:url(#haa47c07400);stroke:#000000;stroke-linejoin:miter;"/>
   </g>
   <g id="patch_5">
    <path clip-path="url(#p41b2d4575b)" d="M 238.164263 345.6 
L 294.500313 345.6 
L 294.500313 0 
L 238.164263 0 
z
" style="fill:url(#hfc7ffd181e);stroke:#000000;stroke-linejoin:miter;"/>
   </g>
   <g id="patch_6">
    <path clip-path="url(#p41b2d4575b)" d="M 294.500313 345.6 
L 403.2 345.6 
L 403.2 0 
L 294.500313 0 
z
" style="fill:url(#ha7c7b034f8);stroke:#000000;stroke-linejoin:miter;"/>
   </g>
   <g id="matplotlib.axis_1">
    <g id="text_1">
     <!-- tree (500, 156, 301) -->
     <g transform="translate(179.865625 357.198437)scale(0.1 -0.1)">
      <defs>
       <path d="M 18.3125 70.21875 
L 18.3125 54.6875 
L 36.8125 54.6875 
L 36.8125 47.703125 
L 18.3125 47.703125 
L 18.3125 18.015625 
Q 18.3125 11.328125 20.140625 9.421875 
Q 21.96875 7.515625 27.59375 7.515625 
L 36.8125 7.515625 
L 36.8125 0 
L 27.59375 0 
Q 17.1875 0 13.234375 3.875 
Q 9.28125 7.765625 9.28125 18.015625 
L 9.28125 47.703125 
L 2.6875 47.703125 
L 2.6875 54.6875 
L 9.28125 54.6875 
L 9.28125 70.21875 
z
" id="DejaVuSans-116"/>
       <path d="M 41.109375 46.296875 
Q 39.59375 47.171875 37.8125 47.578125 
Q 36.03125 48 33.890625 48 
Q 26.265625 48 22.1875 43.046875 
Q 18.109375 38.09375 18.109375 28.8125 
L 18.109375 0 
L 9.078125 0 
L 9.078125 54.6875 
L 18.109375 54.6875 
L 18.109375 46.1875 
Q 20.953125 51.171875 25.484375 53.578125 
Q 30.03125 56 36.53125 56 
Q 37.453125 56 38.578125 55.875 
Q 39.703125 55.765625 41.0625 55.515625 
z
" id="DejaVuSans-114"/>
       <path d="M 56.203125 29.59375 
L 56.203125 25.203125 
L 14.890625 25.203125 
Q 15.484375 15.921875 20.484375 11.0625 
Q 25.484375 6.203125 34.421875 6.203125 
Q 39.59375 6.203125 44.453125 7.46875 
Q 49.3125 8.734375 54.109375 11.28125 
L 54.109375 2.78125 
Q 49.265625 0.734375 44.1875 -0.34375 
Q 39.109375 -1.421875 33.890625 -1.421875 
Q 20.796875 -1.421875 13.15625 6.1875 
Q 5.515625 13.8125 5.515625 26.8125 
Q 5.515625 40.234375 12.765625 48.109375 
Q 20.015625 56 32.328125 56 
Q 43.359375 56 49.78125 48.890625 
Q 56.203125 41.796875 56.203125 29.59375 
z
M 47.21875 32.234375 
Q 47.125 39.59375 43.09375 43.984375 
Q 39.0625 48.390625 32.421875 48.390625 
Q 24.90625 48.390625 20.390625 44.140625 
Q 15.875 39.890625 15.1875 32.171875 
z
" id="DejaVuSans-101"/>
       <path id="DejaVuSans-32"/>
       <path d="M 31 75.875 
Q 24.46875 64.65625 21.28125 53.65625 
Q 18.109375 42.671875 18.109375 31.390625 
Q 18.109375 20.125 21.3125 9.0625 
Q 24.515625 -2 31 -13.1875 
L 23.1875 -13.1875 
Q 15.875 -1.703125 12.234375 9.375 
Q 8.59375 20.453125 8.59375 31.390625 
Q 8.59375 42.28125 12.203125 53.3125 
Q 15.828125 64.359375 23.1875 75.875 
z
" id="DejaVuSans-40"/>
       <path d="M 10.796875 72.90625 
L 49.515625 72.90625 
L 49.515625 64.59375 
L 19.828125 64.59375 
L 19.828125 46.734375 
Q 21.96875 47.46875 24.109375 47.828125 
Q 26.265625 48.1875 28.421875 48.1875 
Q 40.625 48.1875 47.75 41.5 
Q 54.890625 34.8125 54.890625 23.390625 
Q 54.890625 11.625 47.5625 5.09375 
Q 40.234375 -1.421875 26.90625 -1.421875 
Q 22.3125 -1.421875 17.546875 -0.640625 
Q 12.796875 0.140625 7.71875 1.703125 
L 7.71875 11.625 
Q 12.109375 9.234375 16.796875 8.0625 
Q 21.484375 6.890625 26.703125 6.890625 
Q 35.15625 6.890625 40.078125 11.328125 
Q 45.015625 15.765625 45.015625 23.390625 
Q 45.015625 31 40.078125 35.4375 
Q 35.15625 39.890625 26.703125 39.890625 
Q 22.75 39.890625 18.8125 39.015625 
Q 14.890625 38.140625 10.796875 36.28125 
z
" id="DejaVuSans-53"/>
       <path d="M 31.78125 66.40625 
Q 24.171875 66.40625 20.328125 58.90625 
Q 16.5 51.421875 16.5 36.375 
Q 16.5 21.390625 20.328125 13.890625 
Q 24.171875 6.390625 31.78125 6.390625 
Q 39.453125 6.390625 43.28125 13.890625 
Q 47.125 21.390625 47.125 36.375 
Q 47.125 51.421875 43.28125 58.90625 
Q 39.453125 66.40625 31.78125 66.40625 
z
M 31.78125 74.21875 
Q 44.046875 74.21875 50.515625 64.515625 
Q 56.984375 54.828125 56.984375 36.375 
Q 56.984375 17.96875 50.515625 8.265625 
Q 44.046875 -1.421875 31.78125 -1.421875 
Q 19.53125 -1.421875 13.0625 8.265625 
Q 6.59375 17.96875 6.59375 36.375 
Q 6.59375 54.828125 13.0625 64.515625 
Q 19.53125 74.21875 31.78125 74.21875 
z
" id="DejaVuSans-48"/>
       <path d="M 11.71875 12.40625 
L 22.015625 12.40625 
L 22.015625 4 
L 14.015625 -11.625 
L 7.71875 -11.625 
L 11.71875 4 
z
" id="DejaVuSans-44"/>
       <path d="M 12.40625 8.296875 
L 28.515625 8.296875 
L 28.515625 63.921875 
L 10.984375 60.40625 
L 10.984375 69.390625 
L 28.421875 72.90625 
L 38.28125 72.90625 
L 38.28125 8.296875 
L 54.390625 8.296875 
L 54.390625 0 
L 12.40625 0 
z
" id="DejaVuSans-49"/>
       <path d="M 33.015625 40.375 
Q 26.375 40.375 22.484375 35.828125 
Q 18.609375 31.296875 18.609375 23.390625 
Q 18.609375 15.53125 22.484375 10.953125 
Q 26.375 6.390625 33.015625 6.390625 
Q 39.65625 6.390625 43.53125 10.953125 
Q 47.40625 15.53125 47.40625 23.390625 
Q 47.40625 31.296875 43.53125 35.828125 
Q 39.65625 40.375 33.015625 40.375 
z
M 52.59375 71.296875 
L 52.59375 62.3125 
Q 48.875 64.0625 45.09375 64.984375 
Q 41.3125 65.921875 37.59375 65.921875 
Q 27.828125 65.921875 22.671875 59.328125 
Q 17.53125 52.734375 16.796875 39.40625 
Q 19.671875 43.65625 24.015625 45.921875 
Q 28.375 48.1875 33.59375 48.1875 
Q 44.578125 48.1875 50.953125 41.515625 
Q 57.328125 34.859375 57.328125 23.390625 
Q 57.328125 12.15625 50.6875 5.359375 
Q 44.046875 -1.421875 33.015625 -1.421875 
Q 20.359375 -1.421875 13.671875 8.265625 
Q 6.984375 17.96875 6.984375 36.375 
Q 6.984375 53.65625 15.1875 63.9375 
Q 23.390625 74.21875 37.203125 74.21875 
Q 40.921875 74.21875 44.703125 73.484375 
Q 48.484375 72.75 52.59375 71.296875 
z
" id="DejaVuSans-54"/>
       <path d="M 40.578125 39.3125 
Q 47.65625 37.796875 51.625 33 
Q 55.609375 28.21875 55.609375 21.1875 
Q 55.609375 10.40625 48.1875 4.484375 
Q 40.765625 -1.421875 27.09375 -1.421875 
Q 22.515625 -1.421875 17.65625 -0.515625 
Q 12.796875 0.390625 7.625 2.203125 
L 7.625 11.71875 
Q 11.71875 9.328125 16.59375 8.109375 
Q 21.484375 6.890625 26.8125 6.890625 
Q 36.078125 6.890625 40.9375 10.546875 
Q 45.796875 14.203125 45.796875 21.1875 
Q 45.796875 27.640625 41.28125 31.265625 
Q 36.765625 34.90625 28.71875 34.90625 
L 20.21875 34.90625 
L 20.21875 43.015625 
L 29.109375 43.015625 
Q 36.375 43.015625 40.234375 45.921875 
Q 44.09375 48.828125 44.09375 54.296875 
Q 44.09375 59.90625 40.109375 62.90625 
Q 36.140625 65.921875 28.71875 65.921875 
Q 24.65625 65.921875 20.015625 65.03125 
Q 15.375 64.15625 9.8125 62.3125 
L 9.8125 71.09375 
Q 15.4375 72.65625 20.34375 73.4375 
Q 25.25 74.21875 29.59375 74.21875 
Q 40.828125 74.21875 47.359375 69.109375 
Q 53.90625 64.015625 53.90625 55.328125 
Q 53.90625 49.265625 50.4375 45.09375 
Q 46.96875 40.921875 40.578125 39.3125 
z
" id="DejaVuSans-51"/>
       <path d="M 8.015625 75.875 
L 15.828125 75.875 
Q 23.140625 64.359375 26.78125 53.3125 
Q 30.421875 42.28125 30.421875 31.390625 
Q 30.421875 20.453125 26.78125 9.375 
Q 23.140625 -1.703125 15.828125 -13.1875 
L 8.015625 -13.1875 
Q 14.5 -2 17.703125 9.0625 
Q 20.90625 20.125 20.90625 31.390625 
Q 20.90625 42.671875 17.703125 53.65625 
Q 14.5 64.65625 8.015625 75.875 
z
" id="DejaVuSans-41"/>
      </defs>
      <use xlink:href="#DejaVuSans-116"/>
      <use x="39.208984" xlink:href="#DejaVuSans-114"/>
      <use x="78.072266" xlink:href="#DejaVuSans-101"/>
      <use x="139.595703" xlink:href="#DejaVuSans-101"/>
      <use x="201.119141" xlink:href="#DejaVuSans-32"/>
      <use x="232.90625" xlink:href="#DejaVuSans-40"/>
      <use x="271.919922" xlink:href="#DejaVuSans-53"/>
      <use x="335.542969" xlink:href="#DejaVuSans-48"/>
      <use x="399.166016" xlink:href="#DejaVuSans-48"/>
      <use x="462.789062" xlink:href="#DejaVuSans-44"/>
      <use x="494.576172" xlink:href="#DejaVuSans-32"/>
      <use x="526.363281" xlink:href="#DejaVuSans-49"/>
      <use x="589.986328" xlink:href="#DejaVuSans-53"/>
      <use x="653.609375" xlink:href="#DejaVuSans-54"/>
      <use x="717.232422" xlink:href="#DejaVuSans-44"/>
      <use x="749.019531" xlink:href="#DejaVuSans-32"/>
      <use x="780.806641" xlink:href="#DejaVuSans-51"/>
      <use x="844.429688" xlink:href="#DejaVuSans-48"/>
      <use x="908.052734" xlink:href="#DejaVuSans-49"/>
      <use x="971.675781" xlink:href="#DejaVuSans-41"/>
     </g>
    </g>
   </g>
   <g id="matplotlib.axis_2"/>
   <g id="patch_7">
    <path d="M 57.6 345.6 
L 57.6 0 
" style="fill:none;stroke:#000000;stroke-linecap:square;stroke-linejoin:miter;stroke-width:0.8;"/>
   </g>
   <g id="patch_8">
    <path d="M 403.2 345.6 
L 403.2 0 
" style="fill:none;stroke:#000000;stroke-linecap:square;stroke-linejoin:miter;stroke-width:0.8;"/>
   </g>
   <g id="patch_9">
    <path d="M 57.6 345.6 
L 403.2 345.6 
" style="fill:none;stroke:#000000;stroke-linecap:square;stroke-linejoin:miter;stroke-width:0.8;"/>
   </g>
   <g id="patch_10">
    <path d="M 57.6 0 
L 403.2 0 
" style="fill:none;stroke:#000000;stroke-linecap:square;stroke-linejoin:miter;stroke-width:0.8;"/>
   </g>
   <g id="text_2">
    <g id="patch_11">
     <path d="M 134.889085 180.755156 
L 160.875179 180.755156 
L 160.875179 164.844844 
L 134.889085 164.844844 
z
" style="fill:#ffffff;stroke:#ffffff;stroke-linejoin:miter;"/>
    </g>
    <!-- 500 -->
    <g transform="translate(138.489085 175.283437)scale(0.09 -0.09)">
     <defs>
      <path d="M 10.59375 72.90625 
L 57.328125 72.90625 
L 57.328125 59.078125 
L 25.59375 59.078125 
L 25.59375 47.796875 
Q 27.734375 48.390625 29.90625 48.703125 
Q 32.078125 49.03125 34.421875 49.03125 
Q 47.75 49.03125 55.171875 42.359375 
Q 62.59375 35.6875 62.59375 23.78125 
Q 62.59375 11.96875 54.515625 5.265625 
Q 46.4375 -1.421875 32.078125 -1.421875 
Q 25.875 -1.421875 19.796875 -0.21875 
Q 13.71875 0.984375 7.71875 3.421875 
L 7.71875 18.21875 
Q 13.671875 14.796875 19.015625 13.078125 
Q 24.359375 11.375 29.109375 11.375 
Q 35.9375 11.375 39.859375 14.71875 
Q 43.796875 18.0625 43.796875 23.78125 
Q 43.796875 29.546875 39.859375 32.859375 
Q 35.9375 36.1875 29.109375 36.1875 
Q 25.046875 36.1875 20.453125 35.125 
Q 15.875 34.078125 10.59375 31.890625 
z
" id="DejaVuSans-Bold-53"/>
      <path d="M 46 36.53125 
Q 46 50.203125 43.4375 55.78125 
Q 40.875 61.375 34.8125 61.375 
Q 28.765625 61.375 26.171875 55.78125 
Q 23.578125 50.203125 23.578125 36.53125 
Q 23.578125 22.703125 26.171875 17.03125 
Q 28.765625 11.375 34.8125 11.375 
Q 40.828125 11.375 43.40625 17.03125 
Q 46 22.703125 46 36.53125 
z
M 64.796875 36.375 
Q 64.796875 18.265625 56.984375 8.421875 
Q 49.171875 -1.421875 34.8125 -1.421875 
Q 20.40625 -1.421875 12.59375 8.421875 
Q 4.78125 18.265625 4.78125 36.375 
Q 4.78125 54.546875 12.59375 64.375 
Q 20.40625 74.21875 34.8125 74.21875 
Q 49.171875 74.21875 56.984375 64.375 
Q 64.796875 54.546875 64.796875 36.375 
z
" id="DejaVuSans-Bold-48"/>
     </defs>
     <use xlink:href="#DejaVuSans-Bold-53"/>
     <use x="69.580078" xlink:href="#DejaVuSans-Bold-48"/>
     <use x="139.160156" xlink:href="#DejaVuSans-Bold-48"/>
    </g>
   </g>
   <g id="text_3">
    <g id="patch_12">
     <path d="M 253.339242 180.755156 
L 279.325335 180.755156 
L 279.325335 164.844844 
L 253.339242 164.844844 
z
" style="fill:#ffffff;stroke:#ffffff;stroke-linejoin:miter;"/>
    </g>
    <!-- 156 -->
    <g transform="translate(256.939242 175.283437)scale(0.09 -0.09)">
     <defs>
      <path d="M 11.71875 12.984375 
L 28.328125 12.984375 
L 28.328125 60.109375 
L 11.28125 56.59375 
L 11.28125 69.390625 
L 28.21875 72.90625 
L 46.09375 72.90625 
L 46.09375 12.984375 
L 62.703125 12.984375 
L 62.703125 0 
L 11.71875 0 
z
" id="DejaVuSans-Bold-49"/>
      <path d="M 36.1875 35.984375 
Q 31.25 35.984375 28.78125 32.78125 
Q 26.3125 29.59375 26.3125 23.1875 
Q 26.3125 16.796875 28.78125 13.59375 
Q 31.25 10.40625 36.1875 10.40625 
Q 41.15625 10.40625 43.625 13.59375 
Q 46.09375 16.796875 46.09375 23.1875 
Q 46.09375 29.59375 43.625 32.78125 
Q 41.15625 35.984375 36.1875 35.984375 
z
M 59.421875 71 
L 59.421875 57.515625 
Q 54.78125 59.71875 50.671875 60.765625 
Q 46.578125 61.8125 42.671875 61.8125 
Q 34.28125 61.8125 29.59375 57.140625 
Q 24.90625 52.484375 24.125 43.3125 
Q 27.34375 45.703125 31.09375 46.890625 
Q 34.859375 48.09375 39.3125 48.09375 
Q 50.484375 48.09375 57.34375 41.546875 
Q 64.203125 35.015625 64.203125 24.421875 
Q 64.203125 12.703125 56.53125 5.640625 
Q 48.875 -1.421875 35.984375 -1.421875 
Q 21.78125 -1.421875 13.984375 8.171875 
Q 6.203125 17.78125 6.203125 35.40625 
Q 6.203125 53.46875 15.3125 63.796875 
Q 24.421875 74.125 40.28125 74.125 
Q 45.3125 74.125 50.046875 73.34375 
Q 54.78125 72.5625 59.421875 71 
z
" id="DejaVuSans-Bold-54"/>
     </defs>
     <use xlink:href="#DejaVuSans-Bold-49"/>
     <use x="69.580078" xlink:href="#DejaVuSans-Bold-53"/>
     <use x="139.160156" xlink:href="#DejaVuSans-Bold-54"/>
    </g>
   </g>
   <g id="text_4">
    <g id="patch_13">
     <path d="M 335.85711 180.755156 
L 361.843204 180.755156 
L 361.843204 164.844844 
L 335.85711 164.844844 
z
" style="fill:#ffffff;stroke:#ffffff;stroke-linejoin:miter;"/>
    </g>
    <!-- 301 -->
    <g transform="translate(339.45711 175.283437)scale(0.09 -0.09)">
     <defs>
      <path d="M 46.578125 39.3125 
Q 53.953125 37.40625 57.78125 32.6875 
Q 61.625 27.984375 61.625 20.703125 
Q 61.625 9.859375 53.3125 4.21875 
Q 45.015625 -1.421875 29.109375 -1.421875 
Q 23.484375 -1.421875 17.84375 -0.515625 
Q 12.203125 0.390625 6.6875 2.203125 
L 6.6875 16.703125 
Q 11.96875 14.0625 17.15625 12.71875 
Q 22.359375 11.375 27.390625 11.375 
Q 34.859375 11.375 38.84375 13.953125 
Q 42.828125 16.546875 42.828125 21.390625 
Q 42.828125 26.375 38.75 28.9375 
Q 34.671875 31.5 26.703125 31.5 
L 19.1875 31.5 
L 19.1875 43.609375 
L 27.09375 43.609375 
Q 34.1875 43.609375 37.640625 45.828125 
Q 41.109375 48.046875 41.109375 52.59375 
Q 41.109375 56.78125 37.734375 59.078125 
Q 34.375 61.375 28.21875 61.375 
Q 23.6875 61.375 19.046875 60.34375 
Q 14.40625 59.328125 9.8125 57.328125 
L 9.8125 71.09375 
Q 15.375 72.65625 20.84375 73.4375 
Q 26.3125 74.21875 31.59375 74.21875 
Q 45.796875 74.21875 52.84375 69.546875 
Q 59.90625 64.890625 59.90625 55.515625 
Q 59.90625 49.125 56.53125 45.046875 
Q 53.171875 40.96875 46.578125 39.3125 
z
" id="DejaVuSans-Bold-51"/>
     </defs>
     <use xlink:href="#DejaVuSans-Bold-51"/>
     <use x="69.580078" xlink:href="#DejaVuSans-Bold-48"/>
     <use x="139.160156" xlink:href="#DejaVuSans-Bold-49"/>
    </g>
   </g>
  </g>
 </g>
 <defs>
  <clipPath id="p41b2d4575b">
   <rect height="345.6" width="345.6" x="57.6" y="0"/>
  </clipPath>
 </defs>
 <defs>
  <pattern height="72" id="haa47c07400" patternUnits="userSpaceOnUse" width="72" x="0" y="0">
   <rect fill="none" height="73" width="73" x="0" y="0"/>
   <path d="M -36 36 
L 36 -36 
M -24 48 
L 48 -24 
M -12 60 
L 60 -12 
M 0 72 
L 72 0 
M 12 84 
L 84 12 
M 24 96 
L 96 24 
M 36 108 
L 108 36 
" style="fill:#000000;stroke:#000000;stroke-linecap:butt;stroke-linejoin:miter;stroke-width:0.9;"/>
  </pattern>
  <pattern height="72" id="hfc7ffd181e" patternUnits="userSpaceOnUse" width="72" x="0" y="0">
   <rect fill="none" height="73" width="73" x="0" y="0"/>
   <path d="M -36 36 
L 36 108 
M -24 24 
L 48 96 
M -12 12 
L 60 84 
M 0 0 
L 72 72 
M 12 -12 
L 84 60 
M 24 -24 
L 96 48 
M 36 -36 
L 108 36 
" style="fill:#000000;stroke:#000000;stroke-linecap:butt;stroke-linejoin:miter;stroke-width:0.9;"/>
  </pattern>
  <pattern height="72" id="ha7c7b034f8" patternUnits="userSpaceOnUse" width="72" x="0" y="0">
   <rect fill="none" height="73" width="73" x="0" y="0"/>
   <path d="M 6 72 
L 6 0 
M 18 72 
L 18 0 
M 30 72 
L 30 0 
M 42 72 
L 42 0 
M 54 72 
L 54 0 
M 66 72 
L 66 0 
" style="fill:#000000;stroke:#000000;stroke-linecap:butt;stroke-linejoin:miter;stroke-width:0.9;"/>
  </pattern>
 </defs>
</svg>

datamap.py

import matplotlib

matplotlib.rcParams["hatch.linewidth"] = 0.9
from matplotlib import pylab
import matplotlib.pyplot as plt
from matplotlib.patches import Rectangle

from functools import reduce
import io

# Hatch reference: https://matplotlib.org/stable/gallery/shapes_and_collections/hatch_style_reference.html#sphx-glr-gallery-shapes-and-collections-hatch-style-reference-py
# Doubling the size of a string (i.e. '+'*2) makes the hatches thicker
# Use matplotlib.rcParams['hatch.linewidth'] to set the linewidth
def hatches():
    list_ = ["/", "\\", "|", "-", "+", "x", "o", "O", ".", "*"]
    i = 0
    wraps = 0
    while True:
        index = i % len(list_)
        yield list_[i] * (wraps + 1)
        i = i + 1
        if i >= len(list_):
            i -= len(list_)
            wraps += 1


"""
Code adapted from https://scipy-cookbook.readthedocs.io/items/Matplotlib_TreeMap.html
"""


class Treemap:
    """
    Treemap builder using pylab.

    Uses algorithm straight from http://hcil.cs.umd.edu/trs/91-03/91-03.html

    James Casbon 29/7/2006
    """

    def __init__(self, title, tree, labels):
        """example trees:
        tree= ((5,(3,5)), 4, (5,2,(2,3,(3,2,2)),(3,3)), (3,2) )
        tree = ((6, 5))
        """
        self.done = False
        self.hatches_gen = hatches()
        self.tree = tree
        self.labels = labels
        self.title = title

    def compute(self):
        def new_size_method():
            size_cache = {}

            def _size(thing):
                if isinstance(thing, int):
                    return thing
                if thing in size_cache:
                    return size_cache[thing]
                else:
                    size_cache[thing] = reduce(int.__add__, [_size(x) for x in thing])
                    return size_cache[thing]

            return _size

        self.size_method = new_size_method()
        self.ax = pylab.subplot(111, aspect="equal")
        pylab.subplots_adjust(left=0, right=1, top=1, bottom=0)
        self.ax.set_xticks([])
        self.ax.set_yticks([])

        self.iter_method = iter
        self.rectangles = []
        self.addnode(self.tree, lower=[0, 0], upper=[1, 1], axis=0)
        i = 0
        for (n, r) in self.rectangles:
            if isinstance(n, int):
                label = str(self.labels[i])
                i += 1
                rx, ry = r.get_xy()
                cx = rx + r.get_width() / 2.0
                cy = ry + r.get_height() / 2.0
                cx = rx + r.get_width() / 2.0
                cy = ry + r.get_height() / 2.0
                self.ax.annotate(
                    f"{label}",
                    (cx, cy),
                    color="k",
                    backgroundcolor="w",
                    weight="bold",
                    fontsize=9,
                    ha="center",
                    va="center",
                )

        self.ax.set_xlabel(self.title)
        self.done = True

    def as_svg(self):
        matplotlib.use("Agg")  # Use pixel canvas backend instead of GUI backend
        if not self.done:
            self.compute()
        svg = io.BytesIO()
        plt.savefig(svg, format="svg")
        return svg.getvalue().decode(encoding="UTF-8").strip()

    def addnode(self, node, lower=[0, 0], upper=[1, 1], axis=0):
        axis = axis % 2
        hatch = self.draw_rectangle(lower, upper, node)
        width = upper[axis] - lower[axis]
        try:
            for child in self.iter_method(node):
                upper[axis] = lower[axis] + (
                    width * float(self.size_method(child))
                ) / self.size_method(node)
                self.addnode(child, list(lower), list(upper), axis + 1)
                lower[axis] = upper[axis]

        except TypeError:
            pass

    def draw_rectangle(self, lower, upper, node):
        h = None
        if isinstance(node, int):
            h = next(self.hatches_gen)
        r = Rectangle(
            lower,
            upper[0] - lower[0],
            upper[1] - lower[1],
            edgecolor="k",
            fill=False,
            hatch=h,
        )
        self.ax.add_patch(r)
        self.rectangles.append((node, r))
        return h

examples.py

from itertools import islice
import math
import random
from datamap import Treemap
from matplotlib import pylab


def random_label():
    word_file = "/usr/share/dict/words"
    words = [
        w
        for w in open(word_file).read().splitlines()
        if not w.endswith("'s") and len(w) < 4 and len(w) > 1 and w.islower()
    ]
    random.shuffle(words)
    for w in words:
        yield w


if __name__ == "__main__":
    tree = ((5, (3, 5)), 4, (5, 2, (2, 3, (3, 2, 2)), (3, 3)), (3, 2))
    labels = list(islice(random_label(), 15))

    t = Treemap(f"tree {tree}", tree, labels)
    t.compute()
    pylab.show()

    tree = (5, 4, 3, 2)
    labels = [str(n + 1) for n in range(0, 5)]

    t = Treemap(f"tree {tree}", tree, labels)
    t.compute()
    pylab.show()
    """
    Show that the area ratios are correct:
    """
    a = 500
    b = 156
    c = 301
    total = a + b + c
    tree = (a, b, c)

    labels = [str(n) for n in tree]
    t = Treemap(f"tree {tree}", tree, labels)
    t.compute()
    pylab.show()
    get_area = lambda r: r.get_height() * r.get_width()

    for (i, node) in enumerate(tree):
        ratio = (node * 1.0) / total
        rectangle_ratio = get_area(next(x for x in t.rectangles if x[0] == node)[1])
        if not math.isclose(ratio, rectangle_ratio):
            print(
                "For node",
                node,
                "the ratio",
                ratio,
                "differs from rectangle ratio",
                rectangle_ratio,
            )