Welcome to the Finxter blog! My name is Chris, and I started this coding venture a couple of years ago. Check out this podcast generated by NotebookLM about my journey: Over the years, I have chatted with tens of thousands of Finxters who shared their stories and struggles with me. 👉 See here and here to … Read more
With this article, we continue our journey through the realm of Solidity data types following today’s topics: contract types, fixed-size byte arrays, dynamically-sized byte arrays, address literals, rational, and integer literals. It’s part of our long-standing tradition to make this (and other) articles a faithful companion or a supplement to the official Solidity documentation. 👇 … Read more
The “TypeError: ‘method’ object is not subscriptable” occurs when you call a method using square brackets, e.g., object.method[3]. To fix it, call the non-subscriptable method only with parentheses like so: object.method(3). How Does the Error Occur (Example) In the following minimal example, you attempt to define a custom “list” class and you try to access … Read more
Problem Formulation Given an integer number. How to sum over all digits of this number to compute the crossfoot (cross total)? Consider the following examples: 12 –> 1+2 = 3 123 –> 1+2+3 = 3 244 –> 2+4+4 = 10 981223 –> 9+8+1+2+2+3 = 25 Method 1: sum() with Generator Expression The Python built-in sum(iterable) … Read more
💬 Question: Given a Boolean value True or False. How to convert it to a string “True” or “False” in Python? Note that this tutorial doesn’t concern “concatenating a Boolean to a string”. If you want to do this, check out our in-depth article on the Finxter blog. Simple Bool to String Conversion To convert … Read more
A Time Series is essentially a tabular data with the special feature of having a time index. The common forecast taks is ‘knowing the past (and sometimes the present), predict the future’. This task, taken as a principle, reveals itself in several ways: in how to interpret your problem, in feature engineering and in which … Read more
Problem Formulation and Solution Overview This article will show you how to subtract two Lists in Python. 💡 Note: Before subtracting these Lists, ensure each List is of the same length and contains subtractable data. For example, subtracting a List of strings from a List of integers or floats will result in an error. Whereas … Read more
Easy Solution Use the addition + operator and the built-in str() function to concatenate a boolean to a string in Python. For example, the expression ‘Be ‘ + str(True) yields ‘Be True’. The built-in str(boolean) function call converts the boolean to a string. The string concatenation + operator creates a new string by appending the … Read more
Problem 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
Scrapy is an excellent tool for extracting data from static and dynamic websites. In this article, we are going to discuss the solution to the following problems: Extract all details of Offices from the website https:/directory.ntschools.net/#/offices Instead of using a whole scrapy framework, use a typical Python script for extracting the data. For each office, … Read more
Problem Formulation and Solution Overview This article will show you how Python can determine a script’s execution time. Let’s say you have written several code sections. Each section performs identical tasks. How could you best determine which section works faster and more efficiently? 💬 Question: How would we write code to determine a script’s execution … Read more
With this article, we continue our journey through the realm of Solidity data types. 👉 Recommended Tutorial: Solidity Basic Data Types This time, we will focus on fixed point numbers, address types and address type members, and investigate when, how, and why they are used. Traditionally, our articles are running alongside the official Solidity documentation … Read more