Question

所以我有以下目录设置：

项目
- 其他软件包和模块
- 资源
  - 形状
    - Rectangle.py
    - Rectangle2D.py

Rectangle只是一个未被绘制的概念矩形（使用Tkinter），但它是用于碰撞和边界的。 Rectangle2D用作绘制或填充Rectangle的子类。我收到错误之前的课程如下：

Rectangle.py

class Rectangle(object):
    _x = -1
    _y = -1
    _w = -1
    _h = -1

    def __init__(self, x, y, w, h):
        self._x = x
        self._y= y
        self._w = w
        self._h = h

    def intersects(self, other):
        if isinstance(other, Rectangle):
            if (self._x + self._w) > other._x > self._x and (self._y + self._h) > other._y > self._y:
                return True
            elif (self._x + self._w) > (other._x + other._w) > self._x and (self._y + self._h) > other._y > self._y:
                return True
            elif (self._x + self._w) > other._x > self._x and (other._y + other._h) > self._y > other._y:
                return True
            elif (self._x + self._w) > (other._x + other._w) > self._x and (other._y + other._h) > self._y > other._y:
                return True
            else:
                return False
        else:
            return False

    def __eq__(self, other):
        return self._x == other._x and self._y == other._y and self._w == other._w and self._h == other._h

Rectangle2D.py

from tkinter import Canvas
from .Rectangle import Rectangle

class Rectangle2D(Rectangle):
    def __init__(self, x, y, w, h):
        super(Rectangle2D, self).__init__(x, y, w, h)
        self.color = 'black'
        self.id = None

    def draw_rect(self, canvas):
        if isinstance(canvas, Canvas):
            self.id = canvas.create_rectangle(self._x, self._y, self._x + self._w, self._y + self._h, outline=self.color)
            return True
        else:
            print("Improper Parameter Type")
            return False

    def fill_rect(self, canvas):
        if isinstance(canvas, Canvas):
            self.id = canvas.create_rectangle(self._x, self._y, self._x + self._w, self._y + self._h, fill=self.color)
            return True
        else:
            print("Improper Parameter Type")
            return False

一切正常，直到我想向Rectangle.py添加一个返回Rectangle2D.py的方法。除了方法之外，这还记录了要添加到Rectangle.py的以下行：

from .Rectangle2D import Rectangle2D

这导致以下错误：

from .Rectangle import Rectangle
ImportError: cannot import name 'Rectangle'

导致此错误的原因是什么？如何解决？另请注意我正在运行Python 3.6

Python：2个类互相导入会导致错误？

0 个答案: