Python: Fluent Builder Pattern

builder.py

class ObjectPermissions(object):
  perms_map = {}
  specific_object_perms = ()

  @classmethod
  def require(cls, *new_perms):
    class SpecificObjectPermissions(cls):
      specific_object_perms = new_perms
    return SpecificObjectPermissions

  @classmethod
  def methods(cls, **methods):
    class SpecificObjectPermissions(cls):
      perms_map = copy.deepcopy(cls.perms_map)
    SpecificObjectPermissions.perms_map.update(methods)
    return SpecificObjectPermissions


### USAGE

# this can stick around however long you want, or make it 1 use
PermsClass = ObjectPermissions.require('delete', 'invite').methods(POST=['create_user'])
# create an instance
perms = PermsClass()