车辆类:自动.m_平均_速度 = 70 自动.m_最大_速度 = 120 自动.m_品牌 = "AUDI" 自动.m_数_座位 = 4
实现给定对象的高效哈希函数
Here's an example of an efficient hashing function for the given Car object:

```
def hash_car(car):
  hash_str = str(car.m_average_speed) + str(car.m_max_speed) + car.m_brand + str(car.m_num_seats)
  return hash(hash_str)
```

This function concatenates all the relevant attributes of the car object into a string and then hashes it using Python's built-in `hash()` function. This should provide a robust and efficient hash value for the car object.