vacuum.py

#!/bin/python3
import json
import os
import argparse



def make_parser():
    parser = argparse.ArgumentParser(description='Clean up tags.')
    parser.add_argument('input', type=str,
                        help='input filename')
    parser.add_argument('output', type=str,
                        help='output filename')
    return parser

if __name__=="__main__":
    ap=make_parser()
    args=ap.parse_args()
    inf=open(args.input)
    data=json.load(inf)
    for feature in data["features"]:
        h=feature["properties"].get("height",None)
        if h:
            feature["properties"]["height"]="%.1f" % float(h)
        if feature["properties"]["height"]=="0.0":
            del feature["properties"]["height"]
            print('Removed height==0.0')
        keys=list(feature["properties"].keys())
        for k in keys:
            if feature["properties"][k]=="":
                del feature["properties"][k]
    with open(args.output, 'w') as ouf:
        json.dump(data,ouf)