Blender script to export as a geometry for three.js

export_as_primitive.py

import bpy, os

result = ""

obdata = bpy.context.object.data

result += 'Vertices: \n'
for v in obdata.vertices:
    result += ('{}, {}, {}, '.format(v.co.x, v.co.z, v.co.y)) + '\n'

result += 'Edges: \n'
for e in obdata.edges:  
    result += ('{}, {}, '.format(e.vertices[0], e.vertices[1])) + '\n'

result += 'Faces: \n'
for f in obdata.polygons:
    result += ('{}, {}, {}, '.format(f.vertices[2], f.vertices[1], f.vertices[0]))
    result += '\n'
    
# get path to render output (usually /tmp\)
tempFolder = os.path.abspath (bpy.context.scene.render.filepath)
# make a filename
filename = os.path.join (tempFolder, "vertices.txt")
# open a file to write to
file = open(filename, "w")
# write the data to file
file.write(result)
# close the file
file.close()