Learn Nodes

Learn about the building block for other data structures - the node. After learning the concepts behind it, you will implement it in Python.

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Key Concepts

Review core concepts you need to learn to master this subject

Node: An individual part of a larger data structure

Nodes are a basic data structure which contain data and one or more links to other nodes. Nodes can be used to represent a tree structure or a linked list. In such structures where nodes are used, it is possible to traverse from one node to another node.

Orphaned nodes

Nodes that have no links pointing to them except for the head node, are considered "orphaned." In the illustration, if the nodes a2 and a5 are removed, they will be orphaned.

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Nodes: Conceptual
Lesson 1 of 2
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  1. 1

    Nodes are the fundamental building block of many computer science data structures. They form the basis for linked lists, stacks, queues, trees, and more. An individual node contains data and lin...

  2. 2

    The data contained within a node can be a variety of types, depending on the language you are using. In the previous example, it was an integer (the number [...] ), but it could be a string ( [......

  3. 3

    Often, due to the data structure, nodes may only be linked to from a single other node. This makes it very important to consider how you implement modifying or removing nodes from a data structure...

  4. 4

    Let's take a minute to review what we've covered about nodes in this lesson.

    Nodes:

    • Contain data, which can be a variety of data types
    • Contain links to other nodes. If a node has no links, or...
  1. 1

    Now that you have an understanding of what nodes are, let's see one way they can be implemented using Python. We will use a basic node that contains data and one link to another node. The node's ...

  2. 2

    We need methods to access the data and link within the node. For this, we will use two getters, [...] and [...] . These should each return their corresponding value on the [...] object.

  3. 3

    We are only allowing the value of the node to be set upon creation. However, we want to allow updating the link of the node. For this, we will use a setter to modify the [...] attribute. The me...

  4. 4

    We have a few zany characters to keep track of and Python nodes may do just the trick. Let's get started...

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Learn Nodes

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