从 Python 中的另一个 class 实例化 class

Question

I was looking at linked list program in Python I did'nt quite understand it.

I would appreciate if you help me on it.

Im pasting a part of code here, to simplify and understand one functionality

class node:

    def __init__(self,data,nnext=None):
        self.data = data
        self.nnext = nnext

class linkedList:
    def __init__(self):
        self.head = None

    def insertion(self,data):
        myinsertobj = node(data)

Here 1. We have created a class for a node. 2. We created another class with a single head node. 3. In second class we have written a method for inserting. In the insertion() method, we are creating an object to the first class.

Now what I dont understand is, how to create object for the second class ie linkedList class and how to call the insertion() Method,considering the above code only.(I don't want to use helper method yet)

Please help me understand it, as Im new to Python and trying to learn it. The complete code is @ ==> https://www.educative.io/edpresso/how-to-create-a-linked-list-in-python

Also, Please suggest me few references for data structures in simple way.

Answer 1

Given the code you posted, in order to create an object for the second class, you would call

obj1 = linkedList()

where obj1 is now and instance of the linked list class.

To insert a node into obj1 you call the insertion method like so

obj1.insertion(data)

where data can be anything you want to insert.