Simple Shapefile to GeoJSON converter. Using the shapefile from here: http://www.mass.gov/anf/research-and-tech/it-serv-and-support/application-serv/office-of-geographic-information-massgis/datalayers/senate2012.html it will result in an error "ValueError: Record's geometry type does not match collection schema's geometry type: 'Polygon' != 'Unk…

convert.py

import fiona
import fiona.crs

def convert(f_in, f_out):
    with fiona.open(f_in) as source:
        with fiona.open(
                f_out,
                'w',
                driver='GeoJSON',
                crs = fiona.crs.from_epsg(4326),
                schema=source.schema) as sink:

            for rec in source:
                sink.write(rec)