A simple library, using gdspy, to automate the generation of many similar designs with different parameters.
Make sure you have git and gdspy installed. Then from bash do, for example,
mkdir new_layout && cd new_layout
git clone https://github.com/cdoolin/layouter.git
cp layouter/example/make_chip.py .
python make_chip.py
And to save the layout to mylayout.gds,
python make_chip.py mylayout