💡 Idea: Duck typing is a computer science concept where the type of an object is largely ignored—only the methods the object defines matter. This is sometimes referred to as dynamic typing because the type of an object is determined dynamically at runtime rather than checked by the compiler. Instead of checking the type, the … Read more
Abstract: You can easily add multiple values to a key in a Python dictionary using different methods. We’ll explain each of the possible methods in detail, and also show you how you can update and delete multiple values. Finally, we’ll show you how to add multiple values to a python dictionary by creating a function … Read more
Question Recap the following regular expression concepts (more details in the article below): The dot character . in regular expressions matches any character excluding the newline character. For example, the pattern ‘c.t’ will match the strings ‘cat’, ‘cut’, or ‘czt’. The character class [ ] is a set of characters: if you use it in … Read more
Python’s __dir__() magic method implements the functionality of the dir() built-in function. Semantically, dir() returns all (function, object, or variable) names in a given scope. However, the magic method __dir__() converts any return value to a sorted list. Minimal Example The following code defines a custom class My_Class and overrides the __dir__() magic method to … Read more
In the previous posts, we developed simple smart contracts, deployed them using Remix or Truffle, and interacted with them using JSON-RPC interface providers such as using web3.py or web3.js. In this post, we shall take a closer examination into how a smart contract works on the Ethereum blockchain at the grass root. More precisely, we … Read more
In this tutorial, we will learn about the Pandas merge() function. Described in one sentence, the merge() function is used to combine datasets in various ways. As you go through the tutorial, you can watch the following video guide for ease of understanding: Syntax and Parameters Here are the parameters from the official documentation: Parameter … Read more
The Pandas DataFrame has several methods concerning Computations and Descriptive Stats. When applied to a DataFrame, these methods evaluate the elements and return the results. Preparation Before any data manipulation can occur, two (2) new libraries will require installation. The Pandas library enables access to/from a DataFrame. The NumPy library supports multi-dimensional arrays and matrices … Read more
In this tutorial, we will learn the different methods to print a large number in Python. And the contrast between printing integers or floats in those situations. As you go through the article, feel free to watch my explainer video: Problem Formulation: Float vs Integer Printing Python by default prints an approximation in the case … Read more
Quicksort is not only a popular question in many code interviews – asked by Google, Facebook, and Amazon – but also a practical sorting algorithm that is fast, concise, and readable. Because of its beauty, you won’t find many introductions to algorithms that don’t discuss the Quicksort algorithm. In this one-liner tutorial, you’ll learn about … Read more
Syntax and Definition object.__trunc__(self) The Python __trunc__() method implements the behavior of the math.trunc() function. For example, if you attempt to call math.trunc(x), Python will run the x.__trunc__() method to obtain the return value. We call this a “Dunder Method” for “Double Underscore Method” (also called “magic method”). To get a list of all dunder … Read more
[toc] Problem Statement: How to fix “fatal error: Python.h: No such file or directory“? What is a “fatal” error? A fatal error causes a program to end with practically no warning without even saving its state. It usually occurs when an application attempts to access a piece of invalid information or data. The program closes … Read more
Introduction Problem Statement: How to fix “UnicodeDecodeError: ‘utf8’ codec can’t decode byte 0xa5 in position 0: invalid start byte” in Python? Using a specific standard to convert letters, symbols and numbers from one form to another is termed as Encoding. A Unicode character can be encoded using a variety of encoding schemes. The most common … Read more