Python Nested Lists: Explanation & Examples A nested list is a list that contains other lists as its elements. They are commonly used to represent matrices, tables, or hierarchical data structures. 1. Basic Nested List Creation python # A simple 2D list (matrix) matrix = [ [1, 2, 3], [4, 5, 6], [7, 8, 9]…

In Python, a list is a built-in data structure that represents an ordered, mutable (changeable), and heterogeneous (can contain different data types) collection of elements. Lists are one of the most commonly used data structures in Python due to their flexibility and dynamic nature. Definition of a List in Python: Example: python my_list = [1, “hello”, 3.14,…

Special Character Classes Explained with Examples 1. [\\\^\-\]] – Escaped special characters in brackets Description: Matches literal backslash, caret, hyphen, or closing bracket characters inside character classes Example 1: Matching literal special characters python import re text = “Special chars: \\ ^ – ] [” result = re.findall(r'[\\\^\-\]]’, text) print(result) # [‘\\’, ‘^’, ‘-‘, ‘]’] # Matches…

Python Modules: Creation and Usage Guide What are Modules in Python? Modules are simply Python files (with a .py extension) that contain Python code, including: They help you organize your code into logical units and promote code reusability. Creating a Module 1. Basic Module Creation Create a file named mymodule.py: python # mymodule.py def greet(name): return f”Hello, {name}!”…

Python re Flags: re.I, re.S, re.X Explained Flags modify how regular expressions work. They’re used as optional parameters in re functions like re.search(), re.findall(), etc. 1. re.I or re.IGNORECASE Purpose: Makes the pattern matching case-insensitive Without re.I (Case-sensitive): python import re text = “Hello WORLD hello World” # Case-sensitive search matches = re.findall(r’hello’, text) print(“Case-sensitive:”, matches) # Output: [‘hello’] # Only finds lowercase…

append(), extend(), and insert() methods in Python lists, along with slicing where applicable. 1. append() Method Adds a single element to the end of the list. Examples: 2. extend() Method Adds multiple elements (iterable items) to the end of the list. Examples: 3. insert() Method Inserts an element at a specific position. Examples: Key Differences: Method Modifies List? Adds Single/Multiple Elements? Position append() ✅ Yes Single element (even if it’s a list) End…