import lineTools
import json
import os # for getting script path, etc.

def relativePath(path): # the only argument, path, is relative to the directory this script is stored in
    return os.path.join(os.path.dirname(__file__), path)

lines = [lineTools.randomLine(i + 10) for i in range(10)]

with open(relativePath("lines_bhw.json"), "w+") as aFile:
    features = []
    for line in lines:
        features.append({
            "type": "Feature",
            "geometry": {
                "type": "LineString",
                "coordinates": line
            }
        })
    data = {
        "type": "FeatureCollection",
        "features": features
    }

      aFile.write(json.dumps(data))