我接到了一项任务,要求我们处理三个单独的课程:Point
,Rectangle
和Canvas
。我只是想知道是否有人可以帮我理解他们如何互动。编程语言是Python 3
以下是预期的输出:
>>>r1=Rectangle(Point(), Point(1,1), "red")
>>>r1
Rectangle(Point(0,0),Point(1,1),'red')
另一个例子是:
>>> r3=Rectangle(Point(), Point(2,1), "red")
>>> r3.get_perimeter()
6
答案 0 :(得分:0)
如果您问自己,您将获得$a = array(
'book-1' => 'Book Title 1',
'book-2' => 'Book Title 2',
'book-3' => 'Book Title 3',
'book-4' => 'Book Title 4',
'book-5' => 'Book Title 5',
'book-6' => 'Book Title 6',
'book-7' => 'Book Title 7',
'book-8' => 'Book Title 8',
'book-9' => 'Book Title 9'
);
$i = 1;
$bookshelf = 1;
foreach ( array_chunk($a, 4) as $section )
{
echo '<div class="bookshelf-bottom">';
foreach( $section as $k => $v )
{
// Output this for the first and last item. I'd recommend taking this out of the foreach or restructuring this somehow to avoid the manual check.
if ($i == 9 || $i == 1)
{
echo '<div id="bookshelf-'.$bookshelf.'"></div>';
$bookshelf++;
}
$i++;
// Output this book.
echo '<div class="book-frame-'.$s.'">'.$v.'</div>';
}
echo '</div>';
}
类型的对象与其他类型的对象之间的交互:需要定义A
类型的对象是什么?
A
的一种可能实现方式是通过两个相对的角定义矩形,这两个角是平面中的点,可以是Rectangle
类型。 Point
本身可以表示为一对数字。现在明显的定义是
Point
你可以定义
class Point():
def __init__(self, x, y):
self.xCoordinate = x
self.yCoordinate = y
class Rectangle():
def __init__(self, southwest, northeast, colour):
self.bottomLeftCorner = southwest
self.upperRightCorner = northeast
self.fill = colour
按照上限定义,要定义rect = Rectangle(Point(0,1), Point(4,212), "red")
,需要两个Rectangle
个对象和一个Point
。不涉及超类/子类关系。
由于您没有提供String
的任何示例,我无法帮助您,但我认为您可以自行完成。