# http://blender.stackexchange.com/questions/77626/python-create-a-plane-from-selected-vertex

import bpy
import bmesh


def mission1():
    bm, new_coords, obj = coordinates_for_new_plane()

    new_verts = [
        bm.verts.new( v ) for v in new_coords
    ]

    f1 = bm.faces.new( new_verts)

    bmesh.update_edit_mesh(obj.data)
    obj.data.update()


def coordinates_for_new_plane():
    obj = bpy.context.active_object
    if bpy.context.mode != 'EDIT_MESH':
        raise BaseException("should be in edit mode")
    bm = bmesh.from_edit_mesh(obj.data)
    (v1, v2) = [v.co for v in bm.verts if v.select]
    new_coords = [
        [v1.x, v1.y - 100, v1.z + 10],
        [v1.x, v1.y - 100, v1.z - 10],
        [v2.x, v2.y + 100, v2.z - 10],
        [v2.x, v2.y + 100, v2.z + 10],
    ]
    return bm, new_coords, obj


def mission2():

    bm, new_coords, obj = coordinates_for_new_plane()

    name = "platypus"
    mesh = bpy.data.meshes.new(name)

    faces = []
    faces.append( [0,1,2,3])

    mesh.from_pydata(new_coords, [], faces)

    o2 = bpy.data.objects.new(name, mesh)

    scn = bpy.context.scene

    scn.objects.link(o2)

    o2.location = obj.location
    o2.rotation_euler = obj.rotation_euler
    o2.rotation_quaternion = obj.rotation_quaternion
    o2.scale = obj.scale

#
#
#

mission2()