Custom Blender shape exporter

bl_info = {
    "name":         "Space Game Parts",
    "author":       "David Evans",
    "blender":      (2,6,0),
    "version":      (0,0,1),
    "location":     "File > Import-Export",
    "description":  "Export custom data format",
    "category":     "Import-Export"
};

import bpy
import json
import math

def write_some_data(context, filepath):
    f = open(filepath, 'w', encoding='utf-8')
    f.write("var ShipPartData = ");
    jsonObj = {}

    for t in bpy.data.objects:
        if t.type == "FONT":
            partType = t.data.body
            jsonObj[partType] = []
            for child in t.children:
                meshName = child.data.name
                mesh = bpy.data.meshes[meshName]
                orderedVerts = []
                lastEdge = mesh.edges[0]
                orderedVerts.append(lastEdge.vertices[0])
                orderedVerts.append(lastEdge.vertices[1])
                currentVert = orderedVerts[1]

                remainingEdges = []
                for e in mesh.edges:
                    remainingEdges.append(e)
                remainingEdges.remove(mesh.edges[0])

                loop = True
                while loop:
                    for e in remainingEdges:
                        if currentVert in e.vertices:
                            nextVert = -1
                            if currentVert == e.vertices[0]:
                                nextVert = e.vertices[1]
                            elif currentVert == e.vertices[1]:
                                nextVert = e.vertices[0]
                            orderedVerts.append(nextVert)
                            remainingEdges.remove(e)
                            break

                    currentVert = orderedVerts[len(orderedVerts) - 1]
                    if len(orderedVerts) == len(mesh.vertices):
                        loop = False

                coords = []
                for vi in orderedVerts:
                    xCoord = mesh.vertices[vi].co.x
                    yCoord = mesh.vertices[vi].co.y
                    if math.fabs(xCoord) < 0.001:
                        xCoord = 0
                    if math.fabs(yCoord) < 0.001:
                        yCoord = 0
                    coords.append([xCoord, yCoord])

                jsonObj[partType].append(coords)
    f.write(json.dumps(jsonObj))
    f.close()

    return {'FINISHED'}


# ExportHelper is a helper class, defines filename and
# invoke() function which calls the file selector.
from bpy_extras.io_utils import ExportHelper
from bpy.props import StringProperty, BoolProperty, EnumProperty
from bpy.types import Operator

class ExportSomeData(Operator, ExportHelper):
    '''This appears in the tooltip of the operator and in the generated docs'''
    bl_idname = "export_test.some_data"  # important since its how bpy.ops.import_test.some_data is constructed
    bl_label = "Export"

    # ExportHelper mixin class uses this
    filename_ext = ".js"

    filter_glob = StringProperty(
            default="*.js",
            options={'HIDDEN'},
            )

    def execute(self, context):
        return write_some_data(context, self.filepath)


# Only needed if you want to add into a dynamic menu
def menu_func_export(self, context):
    self.layout.operator(ExportSomeData.bl_idname, text="Space Game Parts Exporter")


def register():
    bpy.utils.register_class(ExportSomeData)
    bpy.types.INFO_MT_file_export.append(menu_func_export)


def unregister():
    bpy.utils.unregister_class(ExportSomeData)
    bpy.types.INFO_MT_file_export.remove(menu_func_export)


if __name__ == "__main__":
    register()

    # test call
    bpy.ops.export_test.some_data('INVOKE_DEFAULT')