shp.py is a program to convert from shapefile to a flat CSV format.
I hope you have conda.
Create a conda env with conda create --name shpit or similar.
Then install the required dependencies with
conda install --file requirements.txt
or, if you prefer, pip install -r requirements.txt.
python3 shp.py inputfile.shp
The name of the CSV output file is the same as the input,
with its extension replaced with .csv.
Each row in the output CSV file is a single point.
The first 3 columns of the CSV file are the shape-, part-, and point-index of the polygons. Each part is a ring shaped polygon formed by the points of that part. A shape may have multiple parts when either it is disjoint (a land plus islands, exclaves, bowties) or it is doughnut shaped and contains a hole.
The next 2 columns are the coordinates of the point,
which I have labelled x and y.
You'll have to guess which coordinate system is being used.
The remaining columns are fields from the records in the shapefile; they are repeated for each point in the shape.