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]…
Installing Python and PyCharm on Windows is a straightforward process. Below are the prerequisites and step-by-step instructions for installation. Prerequisites for Installing Python and PyCharm on Windows Step-by-Step Guide to Install Python on Windows Step 1: Download Python Step 2: Run the Python Installer Step 3: Verify Python Installation If Python is installed correctly, it…
A user-defined exception in Python is a custom error class that you create to handle specific error conditions within your code. Instead of relying on built-in exceptions like ValueError, you define your own to make your code more readable and to provide more specific error messages. You create a user-defined exception by defining a new…
1. sorted() Description: Returns a new sorted list from the items in iterable. python # 1. Sort list of numbers numbers = [3, 1, 4, 1, 5, 9, 2] print(sorted(numbers)) # [1, 1, 2, 3, 4, 5, 9] # 2. Sort list of strings fruits = [“banana”, “apple”, “cherry”] print(sorted(fruits)) # [‘apple’, ‘banana’, ‘cherry’] # 3….
Python lists and their methods are used extensively in real-time applications across various domains. They are fundamental for organizing and manipulating ordered collections of data. Real-World Applications of Python Lists 1. Web Development In web development, lists are crucial for handling dynamic data. For example, a list can store user comments on a post, products…
A negative lookbehind assertion in Python’s re module is a zero-width assertion that checks if a pattern is not present immediately before the current position. It is written as (?<!…). It’s the opposite of a positive lookbehind and allows you to exclude matches based on what precedes them. Similar to the positive lookbehind, the pattern…