2 
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)

I try to add an element to the class' array. This code gives an error like this:

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

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  • 1
    You are not creating the instance of class properly. Replace last second line with this b_foo = foo() Commented Sep 24, 2018 at 11:54

1 Answer 1

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7

You should create an instance of your class:

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