Python:对象没有属性错误:一个数组

Question

class foo:
    #initially
    def __init__(self):
        self.nodes1=[]
        self.nodes2=[]
        self.edges=[]

    def add_node(self,type,x,y):
        if type==1:
            self.nodes1.append(node1(x,y))


class node1:
    def __init__(self,x,y): #Getting coordinates from outside while creating the class.
        self.x=x
        self.y=y


b_foo = foo 
b_foo.add_node(b_foo,1,0,1)

我尝试将一个元素添加到类的数组中。此代码给出如下错误:

AttributeError: type object 'bipartite' has no attribute 'nodes1'

Answer 1

你应该为你的类创建一个实例:

b_foo = foo() # creates a class instance
b_foo.add_node(1,0,1) # "self" is passed implicitly