Python-在Point中调用方法以检查Point是否在矩形中

Question

我正在学习Python中的类和方法，并且正在执行“如何像计算机科学家一样思考”中的Rectangle / Point练习。我已经研究过，但没有遇到与我遇到的相同问题的人。我在Rectangle类中调用self.width和self.height时遇到问题。奇怪的是，我在编写的其他方法中都可以毫无问题地调用它。当我调试时，它显示我的宽度和高度的实例为空，而我现在是我的最后选择-在这里！

这是我正在使用的代码：

class Point:
    """Sets up a class point. If user doesn't supply args it starts at
     0,0)"""
    def __init__(self, x = 0, y = 0):
        self.x = x
        self.y = y

class Rectangle:
    '''A class to create rectangle objects '''

    def __init__(self, posn, w, h):
        self.corner = posn  '''position of rectangle as tuple (Point Class)'''
        self.width = w      '''Sets self.width as w'''
        self.height = h     '''Sets self.height as h'''

    '''Added grow and move methods to display how I'm calling
    self.width/height and self.corner.x/y. These both work when I call them'''

    def grow(self, delta_width, delta_height):
        '''Grow or shrink object by deltas'''
        self.width += delta_width
        self.height += delta_height

    def move(self, dx, dy):
        '''Move this object by the deltas'''
        self.corner.x += dx
        self.corner.y += dy

    '''This is where I'm having the problem. '''
    def contains(self, posn):
        return (self.width > self.corner.x >= 0
        and self.height > self.corner.y >= 0)

r = Rectangle(Point(0, 0), 10, 5)

print(r.contains(Point(0,0))) '''Should return True'''
print(r.contains(Point(3,3))) '''Should return True'''
print(r.contains(Point(3, 7))) '''Should return False, but returns True'''

Answer 1

class Point:
    def __init__(self, x=0, y=0):
        self.x = x
        self.y = y


class Rectangle:
    def __init__(self, posn, w, h):
        self.corner = posn
        self.width = w
        self.height = h


    def contains(self, point):
        return self.width > point.x >= self.corner.x and self.height > point.y >= self.corner.y

contains方法正在做什么：

1）检查给定点的x位置是否小于矩形的宽度并大于或等于矩形的角的x位置：

self.width > point.x >= self.corner.x

2）然后对y和高度执行相同的操作：

self.height > point.y >= self.corner.y

3）放在一起看起来像：

def contains(self, point):
    return self.width > point.x >= self.corner.x and self.height > point.y >= self.corner.y