我刚刚开始学习Python/编程。我试图找到答案，但无法找到。所以我在我的实验室中创建了这个名为“Vehicle”的类的代码：
```python
class Vehicle(object):
    def __init__(self, maxspeed, mileage, color="white"):
        self.maxspeed=maxspeed;
        self.mileage=mileage;
        self.color=color;
        
    def assign_seating_capacity(self, seating_capacity):
        self.seating_capacity=seating_capacity
        
    def properties(self):
        print("车辆的属性：")
        print("最大速度：", self.maxspeed)
        print("里程：", self.mileage)
        print("颜色：", self.color)
        try:
            print("座位容量：", self.seating_capacity) 
        except AttributeError:
            print("座位容量未知")

class Vehicle:
    color = "white"
    def __init__(self, max_speed, mileage):
        self.max_speed = max_speed
        self.mileage = mileage
        self.seating_capacity = None

<details>
<summary>英文:</summary>
I just started learning Python/coding in general. I tried to find an answer to this but couldn&#39;t. So I created this code for a Class &quot;Vehicle&quot; in my lab:

def assign_seating_capacity(self, seating_capacity):
    self.seating_capacity=seating_capacity
    
def properties(self):
    print("Properties of the vehicle:")
    print("Maximum Speed:", self.maxspeed)
    print("Mileage:", self.mileage)
    print("Color:", self.color)
    try:
        print("Seating Capacity:", self.seating_capacity) 
    except AttributeError:
        print("Seating capacity unknown")

And then I created a few objects, "vehicle1", vehicle2" and so forth. My first question: is there a way to call a variable name in the function "properties"? So instead of saying "Properties of the vehicle:" it would say "Properties of vehicle1:"? Or is that way too complicated?
My second question is did I use the try/except properly? I thought I was so clever with how I got around the error that happened if I used the "properties" method without first using the "assign_seat_capacity" one. But in my lab they just did it like this:

def __init__(self, max_speed, mileage):
    self.max_speed = max_speed
    self.mileage = mileage
    self.seating_capacity = None

Is it smarter to do it this way or does it not really matter?
Thank you in advance for reading all of this! <3
I had no idea what to do but I tried
print("Properties of", self, ":")
and name, self.name, variable - even though I knew they wouldn't work
</details>
# 答案1
**得分**: 1
```python
class Vehicle(object):
    def __init__(self, maxspeed, mileage, color="white", seating_capacity=0):
        self.maxspeed = maxspeed
        self.mileage = mileage
        self.color = color
        self.seating_capacity = seating_capacity
    def assign_seating_capacity(self, seating_capacity):
        self.seating_capacity = seating_capacity
    def properties(self):
        print("Properties of the vehicle:")
        print("Maximum Speed:", self.maxspeed)
        print("Mileage:", self.mileage)
        print("Color:", self.color)
        print("Seating Capacity:", self.seating_capacity)
    def __repr__(self):
        return f"""
        Properties of the vehicle:
        Maximum Speed {self.maxspeed}
        Mileage: {self.mileage}
        Color: {self.color}
        Seating Capacity: {self.seating_capacity}
        """
if __name__ == "__main__":
    C = Vehicle(100, 24)
    C.assign_seating_capacity(20)
    C.properties()
    print(C)
    D = Vehicle(55, 15, "black", 4)
    print(D)

class Vehicle:
    _id = -1
    def __init__(self, maxspeed: int, mileage: int, colour: str='white', seating_capacity: int|None=None):
        self.maxspeed = maxspeed
        self.mileage = mileage
        self.colour = colour
        self._seating_capacity = seating_capacity
        Vehicle._id += 1
        self._id = Vehicle._id
    @property
    def seating_capacity(self) -> str|int:
        return 'Unknown' if self._seating_capacity is None else self._seating_capacity
    @seating_capacity.setter
    def seating_capacity(self, value: int):
        self._seating_capacity = value
    def __str__(self):
        return f'ID: {self._id}\nMax speed: {self.maxspeed}\nMileage: {self.mileage:,}\nColour: {self.colour}\nSeating capacity: {self.seating_capacity}'
vehicles: list[Vehicle] = []
vehicles.append(Vehicle(150, 1))
vehicles.append(Vehicle(120, 15000, 'blue', 4))
print(*vehicles, sep='\n')
vehicles[0].seating_capacity = 5
vehicles[1].maxspeed = 145
print('---Data changed---')
print(*vehicles, sep='\n')

ID: 0
Max speed: 150
Mileage: 1
Colour: white
Seating capacity: Unknown
ID: 1
Max speed: 120
Mileage: 15,000
Colour: blue
Seating capacity: 4
---Data changed---
ID: 0
Max speed: 150
Mileage: 1
Colour: white
Seating capacity: 5
ID: 1
Max speed: 145
Mileage: 15,000
Colour: blue
Seating capacity: 4

class Vehicle(object):
    def __init__(self, maxspeed, mileage, brand, color="white"):
        self.maxspeed = maxspeed
        self.mileage = mileage
        self.color = color
        self.brand = brand
    def assign_seating_capacity(self, seating_capacity):
        self.seating_capacity = seating_capacity
    def properties(self):
        print(f"\n{self.brand}车辆的属性：")
        print("最大速度：", self.maxspeed)
        print("里程：", self.mileage)
        print("颜色：", self.color)
        try:
            print("座位容量：", self.seating_capacity)
        except:
            print("座位容量未知")
if __name__ == '__main__':
    gm = Vehicle(100, 80000, 'GM', '红色')
    gm.assign_seating_capacity(8)
    ford = Vehicle(125, 100000, 'FORD')
    gm.properties()
    ford.properties()
    print('\n更新:')
    ford.mileage = 75000
    ford.seating_capacity = 5
    ford.properties()
    del(ford.seating_capacity)
    ford.properties()

GM车辆的属性：
最大速度： 100
里程： 80000
颜色： 红色
座位容量： 8
FORD车辆的属性：
最大速度： 125
里程： 100000
颜色： white
座位容量未知
更新：
FORD车辆的属性：
最大速度： 125
里程： 75000
颜色： white
座位容量： 5
FORD车辆的属性：
最大速度： 125
里程： 75000
颜色： white
座位容量未知