Multidimensional Lists and Fuctions in python

Multidimensional Lists and Functions Diving into Higher Dimensions and Modularity! Dr. Rohit Saluja (IIT Mandi)

- What we learned: - Strings are immutable. - Basic operations: - Concatenation - Slicing - Indexing. - Useful methods: .upper(), .lower(), .replace(), .split(), .join(). - Today: String formatting using old methods and f-strings. - Today’s Topic: Multidimensional Lists and Functions Quick Recap : Strings in Python

What will the output be? Answer in zoom chat:

What’s the result True or False? Answer in zoom chat:

Motivation name= “Alice” age = 25 print(“My name is name and I am age years old.”) My name is name and I am age years old. What we want: My name is Alice and I am 25 years old. String Formatting Methods

➢ Old-Style Formatting (%) ○ Uses the % operator to embed variables into strings. ○ Syntax: "string % (values)" where %s is for strings, %d for decimal integers, and %f for floating points. String Formatting Methods

String Formatting Methods Output ➢ Old-Style Formatting (%)

➢ .format() Method ○ More powerful than the old-style formatting. It allows placeholders {} in the string which are replaced with values using the .format() method. ○ Syntax: "string {}".format(values) String Formatting Methods

➢ .format() Method String Formatting Methods Output

➢ f-Strings (Python 3.6+) ○ The most modern and concise way to embed variables directly into a string by prefixing the string with an f or F. ○ Syntax: f"string {variable}" String Formatting Methods

➢ f-Strings (Python 3.6+) String Formatting Methods Output

Lecture Overview - Multidimensional Lists - 2D Lists, 3d Lists - List Manipulation - Applications of Multidimensional Lists - Functions - Defining Functions - Function Parameters - Return Values - Lambda Functions

What are Multidimensional Lists? A multidimensional list is a list where elements themselves are lists. Example

2D Lists A 2D list is a grid or table-like structure, where rows and columns represent data. Example matrix[0] is [1, 2, 3] Matrix[2] is ?

Accessing Elements in 2D Lists To access elements, use two indices: Example as matrix[0] is [1, 2, 3]

Iterating Through a 2D List You can use nested loops to iterate through a 2D list: Example

In Class Activity Question - What will be the output of the following code?

3D Lists A 3D list is a collection of 2D lists. Example cube[0] is [[1, 2], [3, 4]] cube[0][0] is [1, 2] cube[0][1] is ?

Accessing Elements in 3D Lists To access elements, use three indices: Example As cube[0][1] is [3, 4]

Iterating Through a 3D List You can use nested loops to iterate through a 3D list: Example

List Manipulation Adding and Removing Elements/Rows Example

List Manipulation Adding and Removing Elements Example

List Comprehension for Multidimensional Lists Example

In Class Activity Question - What will be the output of the following code? Output - [[0, 1], [1, 2]]

Applications of Multidimensional Lists Multidimensional lists are widely used in: - Matrices for mathematical operations - Image processing (e.g., a 2D array for grayscale images, 3D for RGB) - Game boards (e.g., chessboard, tic-tac-toe)

What are Functions? Functions are reusable blocks of code that perform specific tasks. Syntax

Function Parameters You can pass data to functions using parameters: Example

Positional vs Keyword Arguments - Positional Arguments: Passed in order - Keyword Arguments: Passed by name Example

Function Return Values Functions can return values using the return statement: Example

Multiple Return Values in Functions A function can return multiple values: Example

Lambda Functions A lambda function is an anonymous function defined with a single expression: Example This is similar to- def lambda_add(x, y): return x + y

- What we learned: - Multidimensional Lists - List Manipulation - Applications of Multidimensional Lists - Functions - Defining Functions - Function Parameters - Return Values - Lambda Functions - Next : Classes and Inbuilt Functions Takeaways

Multidimensional Lists and Fuctions in python

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