Continuing on the previous article concerning address member types and type information, we’ll learn about 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. Members of bytes and string Two practical member functions are available for concatenating a variable number of … Read more
Continuing on the previous article concerning units and globally available variables, we’ll learn about members of address types and type information. 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. ▶️ Play: Feel free to watch our article explainer video while … Read more
💬 Question: How to use Python’s string formatting capabilities — f-strings, percentage operator, format(), string.format() — to convert an integer to a hexadecimal string? Lowercase Solution without ‘0x’ Prefix You can convert an integer my_int to a simple lowercase hex string without ‘0x’ prefix by using any of the four string formatting variants—all based on … Read more
This article shows you how to export a Database Table to a CSV file using MySQL. ℹ️ SQL, an acronym for Structured Query Language, is the language of the Database! This standardized language is used to manage databases, tables and the data they hold. A must-have in the coding world. This language allows coders to … Read more
With this article, we’re opening a new area of our study, that of units and globally available variables in Solidity. To begin with, we’ll learn about ether units and time units. After that, we’ll start with a block of subsections on special variables and functions, stretching through this and the next two articles. It’s part … Read more
In this article, we’ll entertain ourselves with conversions between elementary types in Solidity. We’ll mention implicit and explicit conversions, as well as conversions between 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, for this article’s topic. Implicit Conversions The … Read more
💬 Question: How to convert an integer to a hex string in Python? This short tutorial will show you four ways to accomplish this easily and effectively. Let’s dive into the first one right away! 👇 Method 1: hex() The easiest way to convert a decimal integer number x to a hexadecimal string is to … Read more
Now that we’ve covered Thonny and MicroPython, it’s time to get to know the components in your basic Raspberry Pi Pico kit. 🤖 Note: There is more than one kit out there, but it is this author’s opinion that the best value for beginners is the one from UCTRONICS. Most of them have similar components, … Read more
Problem Formulation Given a string in hexadecimal form: How to convert the hex string to a bytearray object in Python? Here are a few examples: Hex String Bytearray Object ’01’ bytearray(b’\x01′) ’04’ bytearray(b’\x04′) ’08’ bytearray(b’\x08′) ’01 0a’ bytearray(b’\x01\n’) ’01 02 0e 0f 0f’ bytearray(b’\x01\x02\x0e\x0f\x0f’) ‘0f 0f’ bytearray(b’\x0f\x0f’) Hex String to Bytearray using bytearray.fromhex(hex_string) To convert … Read more
This article shows you how to execute Python commands in the Shell. ℹ️ The Shell is known as a command-line interface because it interacts with the Operating System. In Windows, it is referred to as the Command Prompt. In Linux, the Terminal. Let’s start learning how to use the Shell! Access the Shell This section … Read more
Quick answer: 👇 Use the f-string expression f’0x{val:X}’ to convert an integer val to a hexadecimal string using uppercase hex letters as set by the capitalized hex format specifier X. Optionally, you can add the prefix ‘0x’ in front of this. Example: 💡 Note: This is Method 3 of this tutorial, and it is presented … Read more
Problem Formulation and Solution Overview This article will show you various ways to work with an XML file. ℹ️ XML is an acronym for Extensible Markup Language. This file type is similar to HTML. However, XML does not have pre-defined tags like HTML. Instead, a coder can define their own tags to meet specific requirements. … Read more