python设计一个矩形(Rectangle)类，具有宽度和高度两个属性，可以通过setter方法设置，也可以通过getter方法获取。设计一个方法计算矩形的面积和周长。请给出使用示例

class Rectangle:
def __init__(self, width, height):
self._width = width
self._height = height

@property
def width(self):
return self._width

@width.setter
def width(self, value):
self._width = value

@property
def height(self):
return self._height

@height.setter
def height(self, value):
self._height = value

def area(self):
return self._width * self._height

def perimeter(self):
return 2 * (self._width + self._height)

# 使用示例
rectangle = Rectangle(4, 5)
print(rectangle.width) # 4
print(rectangle.height) # 5

rectangle.width = 6
rectangle.height = 7
print(rectangle.width) # 6
print(rectangle.height) # 7

print(rectangle.area()) # 42
print(rectangle.perimeter()) # 26