Blender Metarig Generator.py

import bpy


armature = bpy.context.active_object

bpy.ops.object.empty_add(type='PLAIN_AXES', location=(0,0,0))
parent = bpy.context.selected_objects[0]
parent.name = 'metarig'

for bone in armature.pose.bones:
    matrix = (armature.matrix_world.inverted() @ bone.matrix)
    Z = matrix[0][3]
    Y = matrix[2][3]
    X = matrix[1][3]

    bpy.ops.object.empty_add(type='PLAIN_AXES', location=(0, 0, 0))
    axis = bpy.context.selected_objects[0]
    axis.name = 'metarig.' + bone.name
    axis.parent = parent
    axis.scale = (5,5,5)
    crc = axis.constraints.new('COPY_ROTATION')
    crc.target = armature
    crc.subtarget = bone.name
    crc.use_offset = True
    clc = axis.constraints.new('COPY_LOCATION')
    clc.target = armature
    clc.subtarget = bone.name
    clc.use_offset = True