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Data Structures & Algorithm in Python: Everything You Need to Know
Updated on 04 March, 2024
45.26K+ views
• 12 min read
Table of Contents
Data structures algorithm in Python are fundamental concepts in computer science. They’re indispensable tools for any programmer. In Python, data structures handle the organization and storage of data in memory while a program is processing it. On the other hand, Python algorithms are detailed sets of instructions that guide data processing for specific purposes.
I’ve found that different data structures are logically utilized by algorithms to solve various data analysis problems. Whether tackling real-world challenges or typical coding questions, understanding Python algorithms and data structures is crucial for crafting accurate solutions.
In this article, I delve into various Python algorithms and data structures. To expand your Python expertise, consider exploring our Data Science Courses.
Learn more: The Six Most Commonly Used Data Structures in R
What are data structures in Python?
Data structures are a way of organizing and storing data; they explain the relationship between data and various logical operations that can be performed on the data. There are many ways in which data structures can be classified. One way is to categorize them into primitive and non-primitive data types.
While the primitive data types include Integers, Float, Strings and Boolean, the non-primitive data types are Array, List, Tuples, Dictionary, Sets and Files. Some of these non-primitive data types, such as List, Tuples, Dictionaries and Sets, are in-built in Python. There is another category of data structures in Python that is user-defined; that is, users define them. These include Stack, Queue, Linked List, Tree, Graph and HashMap.
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Primitive Data Structures
These are the basic data structures in Python containing pure and simple data values and serve as the building blocks for manipulating data. Let us talk about the four primitive types of variables in Python:
- Integers – This data type is used to represent numerical data, that is, positive or negative whole numbers without a decimal point. Say, -1, 3, or 6.
- Float – Float signifies ‘floating-point real number.’ It is used to represent rational numbers, usually containing a decimal point like 2.0 or 5.77. Since Python is a dynamically typed programming language, the data type that an object stores is mutable, and there is no need to state the type of your variable explicitly.
- String – This data type denotes a collection of alphabets, words or alphanumeric characters. It is created by including a series of characters within a pair of double or single quotes. To concatenate two or more Strings, the ‘+’ operation can be applied to them. Repeating, splicing, capitalizing, and retrieving are some of the other String operations in Python. Example: ‘blue,’ ‘red,’ etc.
- Boolean – This data type is useful in comparison and conditional expressions and can take up the values TRUE or FALSE.
Know more: Data Frames in Python
In-built Non-Primitive Data Structures
In contrast to primitive data structures, non-primitive data types not only store values, but a collection of values in different formats. Let us have a look at non-primitive data structures in Python:
- Lists – This is the most versatile data structure in Python and is written as a list of comma-separated elements enclosed within square brackets. A List can consist of both heterogeneous and homogeneous elements. Some of the methods applicable on a List are index(), append(), extend(), insert(), remove(), pop(), etc. Lists are mutable; that is, their content can be changed, keeping the identity intact.
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- Tuples – Tuples are similar to Lists but are immutable. Also, unlike Lists, Tuples are declared within parentheses instead of square brackets. The feature of immutability denotes that once an element has been defined in a Tuple, it cannot be deleted, reassigned or edited. It ensures that the declared values of the data structure are not manipulated or overridden.
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- Dictionaries – Dictionaries consist of key-value pairs. The ‘key’ identifies an item, and the ‘value’ stores the value of the item. A colon separates the key from its value. The items are separated by commas, with the entire thing enclosed within curly brackets. While keys are immutable (numbers, Strings or Tuples), the values can be of any type.
- Sets – Sets are an unordered collection of unique elements. Like Lists, Sets are mutable and written within square brackets, but no two values can be the same. Some Set methods include count(), index(), any(), all(), etc.
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- Lists vs. Arrays – There is no in-built concept of Arrays in Python. Arrays can be imported using the NumPy package before initializing them. To know more about NumPy one can checkout our python NumPy tutorial. Lists and Arrays are mostly similar except one difference – while Arrays are collections of only homogeneous elements, Lists include both homogeneous and heterogeneous items.
Checkout: Types of Binary Tree
User-defined Data Structures in Python
Next up in our discussion on data structures and algorithms in Python is a brief overview of the different user-defined data structures:
- Stacks – Stacks are linear data structures in Python. Storing items in Stacks is based on the principles of First-In/Last-Out (FILO) or Last-In/First-Out (LIFO). In Stacks, the addition of a new element at one end is accompanied by the removal of an element from the same end. The operations ‘push’ and ‘pop’ are used for insertions and deletions, respectively. Other functions related to Stack are empty(), size() and top(). Stacks can be implemented using modules and data structures from the Python library – list, collections.deque, and queue.LifoQueue.
- Queue – Similar to Stacks, Queues are linear data structures. However, items are stored based on the First- In/ First- Out (FIFO) principle. In a Queue, the item that is least recently added is removed first. Operations related to Queue include Enqueue (adding elements), Dequeue (deleting elements), Front and Rear. Like Stacks, Queues can be implemented using modules and data structures from the Python library – list, collections.deque, and queue.
- Tree – Trees are non-linear data structures in Python and consist of nodes connected by edges. The properties of a Tree are one node is designated the root node, other than the root, every other node has an associated parent node, and each node can have an arbitrary number of children nodes. A binary Tree data structure is one whose elements have no more than two children.
- Linked List – A series of data elements joined together via links is termed as a Linked List in Python. It is also a linear data structure. Each data element in a Linked List is connected to another using pointer. Since the Python library does not contain Linked Lists, they are implemented using the concept of nodes. Linked Lists have an advantage over Arrays in having a dynamic size, with ease of inserting/deleting elements.
- Graph – A Graph in Python pictorially represents a set of objects, with some object pairs connected by links. Vertices represent the objects that are interconnected, and the links that join the vertices are termed as edges. The Python dictionary data type can be used to present graphs. In essence, the ‘keys’ of the dictionary represent the vertices, and the ‘values’ indicate the connections or the edges between the vertices.
- HashMaps/Hash Tables – In this type of data structure, a Hash function generates the address or index value of the data element. The index value serves as the key to the data value allowing faster access of data. As in the dictionary data type, Hash Tables have key-value pairs, but a hashing function generates the key.
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What are Algorithms in Python?
Python algorithms are a set of instructions that are executed to get the solution to a given problem. Since algorithms are not language-specific, they can be implemented in several programming languages. No standard rules guide the writing of algorithms. They are resource- and problem-dependent but share some common code constructs, such as flow-control (if-else) and loops (do, while, for). In the following sections, we will briefly discuss Tree Traversal, Sorting, Searching, and Graph Algorithms.
Also, Check out all trending Python tutorial concepts in 2024.
Tree Traversal Algorithms
Traversal is a process of visiting all the nodes of a Tree, starting from the root node. A Tree can be traversed in three different ways:
– In-order traversal involves visiting the subtree on the left first, followed by the root, and then the right subtree.
– In the pre-order traversal, the first to be visited is the root node, followed by the left subtree, and finally, the right subtree.
– In the post-order traversal algorithm, the left subtree is visited first, then the right subtree is visited, with the root node being visited last.
Learn more: How to Create Perfect Decision Tree
Sorting Algorithms
Sorting algorithms denote the ways to arrange data in a particular format. Sorting ensures that data searching is optimized to a high level and that the data is presented in a readable format. Let us look at the five different types of Sorting algorithms in Python:
- Bubble Sort – This algorithm is based on comparison in which there is repeated swapping of adjacent elements if they are in an incorrect order.
- Merge Sort – Based on the divide and conquer algorithm, Merge sort divides the Array into two halves, sorts them, and then combines them.
- Insertion Sort – This sorting begins with comparing and sorting the first two elements. Then, the third element is compared with the two previously sorted elements and so on.
- Shell Sort – It is a form of Insertion sort, but here, far away elements are sorted. A large sub-list of a given list is sorted, and the size of the list is progressively reduced until all the elements are sorted.
- Selection Sort – This algorithm begins by finding the minimum value from a list of elements and puts it into a sorted list. The process is then repeated for each of the remaining elements in the list which is unsorted. The new element entering the sorted list is compared with its existing elements and placed at the correct position. The process goes on until all the elements are sorted.
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Searching Algorithms
Searching algorithms help in checking and retrieving an element from different data structures. One type of searching algorithm applies the method of sequential search where the list is sequentially traversed, and every element is checked (linear search). In another type, the interval search, elements are searched for in sorted data structures (binary search). Let us look at some of the examples:
- Linear Search – In this algorithm, each item is sequentially searched one by one.
- Binary Search – The search interval is repeatedly divided in half. If the element to be searched is lower than the central component of the interval, the interval is narrowed to the lower half. Otherwise, it is narrowed to the upper half. The process is repeated until the value is found.
Graph Algorithms
There are two methods of traversing graphs using their edges. These are:
- Depth-first Traversal (DFS) – In this algorithm, a graph is traversed in a depthward motion. When any iteration faces a dead end, a stack is used to go to the next vertex and start a search. DFS is implemented in Python using the set data types.
- Breadth-first Traversal (BFS) – In this algorithm, a graph is traversed in a breadthward motion. When any iteration faces a dead end, a queue is used to go to the next vertex and start a search. BFS is implemented in Python using the queue data structure.
Algorithm Analysis
- A Priori Analysis – This represents a theoretical analysis of the algorithm before its implementation. An algorithm’s efficiency is measured by presuming that factors, such as processor speed, are constant and have no consequence on the algorithm.
- A Posterior Analysis – This refers to the empirical analysis of the algorithm after its implementation. A programming language is used to implement the selected algorithm, followed by its execution on a computer. This analysis collects statistics, such as the time and space required for the algorithm to run.
Conclusion
Whether you’re an experienced programmer or just starting out, data structures algorithm in Python are essential. These concepts are vital for optimizing data processing when working with data. Data structures organize information, while algorithms guide data analysis problems. Together, they form the backbone of computer science for processing input data efficiently.
If you’re interested in delving into data science, I strongly recommend exploring IIIT-B & upGrad’s Executive PG Programme in Data Science. This program offers 10+ case studies & projects, practical hands-on workshops, mentorship with industry experts, 1-on-1 sessions with industry mentors, 400+ hours of learning, and job assistance with top firms.
Frequently Asked Questions (FAQs)
1. How many days does it take to learn Data Structures & Algorithms?
When it comes to Computer Science, Data Structures Algorithms are considered to be the hardest topics of all. But, they are really important to learn for every programmer. If you are spending approximately 3-4 hours on a daily basis, then you will require at least 6 to 8 weeks for learning data structures and algorithms.
There is no rigid timeline over here because it will completely depend on your pace and learning capabilities. If you are good at grasping the fundamentals, then you will find it pretty easy to get along with the in-depth concepts of data structures and algorithms.
2. What are the different types of the algorithm?
An algorithm is a step-by-step procedure that has to be followed for solving any problem. Different problems need different algorithms for solving the problem. Every programmer selects an algorithm for solving a particular problem based on the requirements and speed of the algorithm.
Still, there are certain top algorithms that programmers usually consider for solving different problems. Some of the well-known algorithms are the Brute-force algorithm, Greedy algorithm, Randomized algorithm, Dynamic programming algorithm, Recursive algorithm, Divide & Conquer algorithm, and Backtracking algorithm.
3. What is the major use of Python?
Python is a general-purpose programming language that is utilized for performing different activities. The best thing about Python is that it is not bound to any specific application, and you can use it as per your requirements. Due to the availability of libraries, versatility, and easy-to-understand structure, it is considered to be one of the most-used programming languages among developers.
Python is majorly used for the development of websites and software. Other than that, it is also used for task automation, data visualization, and data analysis. Python is pretty easy to learn, and this is why even non-programmers are adopting this language for organizing finances and performing other everyday tasks.