little python function to write a .geojson file to display a list of coordinates, x and y

xy2geojson.py

f = open('points.geojson', 'w')
f.write('\n')
f.write('{\n')
f.write('  "type": "FeatureCollection",\n')
f.write('  "features": [\n')
for k in range(len(x)):
   f.write('\n')
   f.write(' {\n')
   f.write('      "type": "Feature",\n')
   f.write('      "geometry": {\n')
   f.write('        "type": "Point",\n')
   f.write('        "coordinates": ['+str(y[k])+', '+str(x[k])+']\n')
   f.write('      },\n')
   f.write('      "properties": {\n')
   f.write('        "'+str(k)+'": "description here"\n')
   f.write('      }\n')
   if k==len(x)-1:
     f.write('    }\n')
   else:
     f.write('    },\n')
f.write('\n')
f.write('\n')
f.write('  ]\n')
f.write('}\n')
f.close()