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我正在实现一个图形，并将一个 Route 类作为 Edge 类的子类。我试图在我的 Route 类中添加一个“距离”功能，所以我的 Route 类的构造函数覆盖了我的 Edge 类的构造函数。

由于它们位于不同的模块中，因此我在 Route 类中使用了“from Edge import *”；但是，程序（PyDev）仍然抛出错误，未定义变量：Edge

这是我的实现：

'''
An (directed) edge holds the label of the node where the arrow is coming from
and the label of the node where the arrow is going to
'''

class Edge:

    '''
    Constructor of the Edge class
    '''
    def __init__(self, fromLabel, toLabel):
        self.__fromLabel = fromLabel
        self.__toLabel = toLabel

    '''
    Get the label of the node where the arrow is coming from
    @return the label of the node where the arrow is coming from
    '''
    def getFromLabel(self):
        return self.__fromLabel

    '''
    Get the label of the node where the arrow is going to
    @return the label of the node where the arrow is going to
    '''
    def getToLabel(self):
        return self.__toLabel

from Edge import *

'''
A Route is inherited from the Edge class and is an edge specialized for the 
CSAirGraph class
'''

class Route(Edge):

    '''
    Constructor of the Route class
    '''
    def __init__(self, fromLabel, toLabel, distance):
        Edge.__init__(self, fromLabel, toLabel)
        self.__distance = distance

    '''
    Get the distance between two adjacent cities
    @return: the distance between two adjacent cities
    '''
    def getDistance(self):
        return self.__distance
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