docs: def serialize_attrs(self, *args):
          """Converts and instance to a dictionary with only the specified
          attributes as keys
  
          Args:
              *args (list): The attributes to serialize
  
          Examples:
  
              >>> customer = Customer.create(name="James Bond", email="007@mi.com",
                                             phone="007", city="London")
              >>> customer.serialize_attrs('name', 'email')
              {'name': u'James Bond', 'email': u'007@mi.com'}
  
          """
          # return dict([(a, getattr(self, a)) for a in args])
          cls = type(self)
          result = {}
          # result = {
          #     a: getattr(self, a)
          #     for a in args
          #     if hasattr(cls, a) and
          #     a not in cls.attrs_forbidden_for_serialization()
          # }
          for a in args:
              if hasattr(cls, a) and a not in cls.attrs_forbidden_for_serialization():
                  val = getattr(self, a)
                  if is_list_like(val):
                      result[a] = list(val)
                  else:
                      result[a] = val
          return result