python定义一个雁类Geese并在该类中定义4个类属性前三个用于记录雁类的特征第4个用于记录实例编号然后定义一个构造方法在该构造方法中将记录实例编号的类属性进行加1操作并输出4个类属性的值最后通过for循环创建4个雁类的实例。简单一些

class Geese: wing_color = "gray" neck_length = "long" beak_shape = "pointed" instance_num = 0

def __init__(self):
    Geese.instance_num += 1
    print("Instance number:", Geese.instance_num)
    print("Wing color:", Geese.wing_color)
    print("Neck length:", Geese.neck_length)
    print("Beak shape:", Geese.beak_shape)

for i in range(4): goose = Geese()