ChrisProblem Formulation Consider the following minimal example where a TypeError: ‘bool’ object is not subscriptable occurs: This yields the following output: Solution Overview Python raises the TypeError: ‘bool’ object is not subscriptable if you use indexing or slicing with the square bracket notation on a Boolean variable. However, the Boolean type is not indexable and … Read more
Python gets updated roughly once per year with a major update and security fixes. So, Python’s update cycle is 12 months. The end-of-life, i.e., the period during which one Python version is supported, is normally set to 5 years. The following graphic shows a great screenshot of supported and unsupported Python versions at the time … Read more
Coding Challenge 💬 Coding Challenge: Given a nested Python list, i.e., a list of lists. How to convert it to a string list, so that each inner list becomes a single string? Consider the following examples: 1. Input: [[‘h’, ‘e’, ‘l’, ‘l’, ‘o’], [‘w’, ‘o’, ‘r’, ‘l’, ‘d’]] Output: [‘hello’, ‘world’] 2. Input: [[‘h’, ‘i’], … Read more
Python provides three ways to stop a for loop: The for loop ends naturally when all elements have been iterated over. After that, Python 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 construct. The keyword continue terminates … Read more
⚔️ Programming Challenge: Given an integer n that could be very high (e.g., n=1000000). How to initialize a Python dictionary of size n that is fast, easy, and efficient? Next, you’ll learn the five main ways to solve this and compare their performance at the end of this article. Interestingly, the winner Method 4 is … Read more
Basic Solution To create a set of n elements, pass a list or another iterable of n initial elements into the set() function. For example, set(range(n)) creates the set of n consecutive integers {1, 2, …, n-1}. You can then add and remove the elements using the normal set methods such as add() or pop(). … Read more
Coding Challenge ⚔️ Challenge: Given an integer d representing the number of digits. How to create a random number with d digits in Python? Here are three examples: my_random(2) generates 12 my_random(3) generates 389 my_random(10) generates 8943496710 I’ll discuss three interesting methods to accomplish this easily in Python—my personal favorite is Method 2! Shortest Solution … Read more
Problem Formulation 💬 Programming Challenge: Given a dictionary where the values are lists of varying sizes. Find and return the shortest list! Here’s an example: Also, you’ll learn how to solve a variant of this challenge. 💬 Bonus challenge: Find only the key that is associated with the shortest list in the dictionary. Here’s an … Read more
There are four major ways to install the Solidity compiler: Install Solidity Compiler via npm Install Solidity Compiler via Docker on Ubuntu Install Solidity Compiler via Source Code Compilation Install Solidity Compiler via Static Binary and Linux Packages In this tutorial, we’ll have a quick look at each of them and give you a link … Read more
Problem Formulation 💬 Programming Challenge: Given a list of lists (nested list). Find and return the shortest inner list from the outer list of lists. Here are some examples: [[1], [2, 3], [4, 5, 6]] 👉 [1] [[1, [2, 3], 4], [5, 6], [7]] 👉 [7] [[[1], [2], [3]], [4, 5, [6]], [7, 8, 9, … Read more
Problem Formulation 💬 Programming Challenge: Given a dictionary where the values are lists of varying sizes. Find and return the longest list! Here’s an example: Also, you’ll learn how to solve a variant of this challenge. 💬 Bonus challenge: Find only the key that is associated with the longest list in the dictionary. Here’s an … Read more
You can check programmatically in Python whether a certain ENS ‘.eth‘ domain name is available by using the urlopen() function from urllib.request module to access the URL ‘https://etherscan.io/enslookup-search?search=example.eth’, replacing the URL suffix ‘example.eth’ with your desired domain. In the following example code snippet, I show how you could check a list of names, one domain … Read more