This tutorial explores the ways one can check if a variable is a class. The direct way to check if a variable is a class, is to use the isclass() runtime service, from Python’s inspect module. Use isclass() in conjunction with Python’s isinstance() built-in function, to examine a variable. Both of these return a Boolean … Read more
Do you train for your upcoming coding interview? This question was asked by Google as reported in multiple occasions by programmers all around the world. Can you solve it optimally? Let’s dive into the problem first. Problem Formulation Given an integer array or Python list nums and an integer value k. Find and return the … Read more
To print a percentage value in Python, use the str.format() method or an f-string on the format language pattern “{:.0%}”. For example, the f-string f”{your_number:.0%}” will convert variable your_number to a percentage string with 0 digits precision. Simply run those three basic statements in your shell: your_number = 0.42 percentage = “{:.0%}”.format(your_number) print(percentage) As a … Read more
Iterables and iterators are everywhere in Python. We usually aren’t aware of the iterators because the syntax of python hides them from us. Almost every time we manipulate a sequence type (strings, lists, tuples, sets, arrays, etc.), we’re using an iterator behind the scenes. An iterable represents a sequence of values each of which is … Read more
A Python class attribute is a variable that belongs to a class, not an individual instance, and is shared among all instances. An instance attribute is a variable that belongs to exactly one object. An instance attribute is defined inside the __init__() method by using the reference to the instance self, whereas a class attribute … Read more
Python provides three ways to stop a while loop: The while loop condition is checked once per iteration. If it evaluates to False, the program ends the loop and proceeds with the first statement after the loop construct. The keyword break terminates a loop immediately. The program proceeds with the first statement after the loop … Read more
When mentally approaching this problem, you may be tempted to utilize a “for loop”. I admit that’s how my mind was working: iterate through the list one element at a time and check for empty strings. If it’s empty, remove it. Repeat. Please join me in today’s topic on how to remove empty strings from … Read more
A couple of years ago, I fell into the habit of creating cheat sheets when exploring certain areas in the programming space. Over time, hundreds of thousands of Finxters have downloaded and used them in their own learning journeys. However, the cheat sheets are largely scattered around many different locations on the Finxter ecosystem. And … Read more
Problem Formulation Given a string s. How to find the substring s’ between an opening and a closing parentheses? Consider the following examples: Input: ‘Learn Python (not C++)’ Output: ‘not C++’ Input: ‘function(a, b, c, d)’ Output: ‘a, b, c, d’ Input: ‘(a+(b+c))’ Output: ‘a+(b+c)’ Method 1: Slicing and str.find() The simplest way to extract … Read more
In this tutorial you will learn how to implement a simple Python program to detect if a linked list consists of a cycle or not. If you need a brief refresher on linked lists, do check out this blog post. Definition of a Cycle in a Linked List A linked list can consist of a … Read more
The set data structure is one of the most underused primary data structures in Python. I’ve seen so many intermediate-level coders who use lists when all they need is a data structure that checks membership!! ? Understanding the basics differentiates the good from the great. In this tutorial, you’ll learn about Python’s basic set methods. First, … Read more
In Python, everything is an object. Even integers are objects — this is different from programming languages like Java where integers, floats, and Booleans are primitive data types. In this way, Python is built on a rigorously consistent object-oriented paradigm. Considering that objects are everywhere in Python, object-oriented programming is not well studied by Python … Read more