Locally installed virtualenv for development

requirements.txt

+dxfwrite
+numpy
+pydot
+pytest
+PyYAML
+svgwrite
+sympy
+triangle
+networkx
+numpy-stl
+plotly
+kaleido

vstart.sh

+#!/bin/bash
+
+unset PYTHONPATH
+
+if [ ! -d "ENV" ]; then
+  python3 -m virtualenv -p python3 ENV &&
+    source ENV/bin/activate &&
+    pip3 install -r requirements.txt &&
+    pip3 install -e .
+fi
+
+alias deactivate=exit
+
+exec bash --init-file <(echo ". ~/.bashrc; . ENV/bin/activate;")