Minimal Error Example Given the following minimal example where you create a set and attempt to access an element of this set using indexing or slicing: If you run this code snippet, Python raises the TypeError: ‘set’ object is not subscriptable: Why Does the Error Occur? The Python TypeError: ‘set’ object is not subscriptable occurs … Read more
The TypeError: unhashable type: ‘list’ usually occurs when you try to use a list object as a set element or dictionary key and Python internally passes the unhashable list into the hash() function. But as lists are mutable objects, they do not have a fixed hash value. The easiest way to fix this error is … Read more
Problem Formulation 💬 Question: Given a list of lists (=nested list) in Python. How to convert this list of lists to a set in Python? This is not a trivial problem because Python lists are mutable and, therefore, not hashable. And because of that, they cannot be converted to a set using the direct set() … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to find the 2nd largest List element in Python. To make it more fun, we have the following running scenario: Rivers Clothing is currently reviewing its projected earnings for the next six (6) months. As their IT Specialist, you saved this data in a … Read more
Python has list comprehension and dictionary comprehension as a concise way to create a list or a dictionary by modifying an existing iterable. Python also has generator expressions that allow you to create an iterable by modifying and potentially filtering each element in another iterable and passing the result in a function, for instance. Does … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to check a List for Duplicates in Python. To make it more fun, we have the following running scenario: The Finxter Academy has given you an extensive list of usernames. Somewhere along the line, duplicate entries were added. They need you to check if … Read more
[toc] Problem Statement Create a tuple from user input in Python. Create a set from user input in Python. How to take Set as an Input from the User? Method 1: Using a Set Comprehension Approach: The simplest way to take a set as an input from the user is to use a set comprehension. … Read more
This is a simple algorithm to find all the powersets of a given set. If you feel like you need to refresh your Python set skills, have a look at my complete guide to Python sets (with Harry Potter examples). Problem Formulation: Powerset What is the powerset of a given set s? The powerset is … Read more
Problema: Se dan dos listas l1 y l2. Quieres realizar una de las siguientes acciones: 1. Comparación booleana: comparar las listas por elementos y devolver True si la métrica de comparación devuelve True para todos los pares de elementos y False en caso contrario. 2. Diferencia: encontrar la diferencia entre los elementos de la primera … Read more
Problem Formulation Given a set of elements. If you print the list to the shell using print({1, 2, 3}), the output is enclosed in curly brackets (braces) like so: {1, 2, 3}. But you want the set without brackets like so: 1, 2, 3. How to print the set without enclosing brackets? Method 1: Unpacking … Read more
Do you need to create a function that returns a set but you don’t know how? No worries, in sixty seconds, you’ll know! Go! ? A Python function can return any object such as a set. To return a set, first create the set object within the function body, assign it to a variable your_set, … Read more
Have you stumbled upon the strange-looking Python operator A |= B in a code snippet and you don’t know what it means? This article will clarify it once and for all! Let’s start with the short answer: Python’s A |= B applies the | operator in place. Thus, it is semantically identical to the longer-form … Read more