Method overriding vs overloading in Python—what’s the difference? If you’re short on time—here it is: Method overloading: creating a method that can be called with different arguments such as m() and m(1, 2, 3). Method overriding: overwriting the functionality of a method defined in a parent class. In method overloading, methods in a given class … Read more
[toc] ? This is one of the Google interview questions and reported by programmers across the globe as one of the commonly asked questions during interviews. So, can you give the optimal solution to this problem? Problem Formulation Given an integer array or Python list nums, an integer value x and k. Find and return … Read more
Hacking Alexa’s Voice Recordings After David’s mother passed away, he wanted to hear her voice again. As she used Amazon Alexa, he figured, he could download the voice recordings from the Alexa device. But Amazon didn’t provide an interface for it. Fortunately he found this project online: [Cool Project] Hacking Alexa’s Voice Recordings After following … Read more
Problem Formulation The following problem formulation is taken from this Kata. Design a recursive function called replicate(times, number) that returns an array of repetitions of the number argument. For example, replicate(3, 5) should return the list [5, 5, 5]. If the times argument is negative, return an empty array. Do not use loops to solve … Read more
Problem Formulation Given an image stored at image.jpeg, a target width and height in pixels, and a target starting point (upper-left) x and y in the coordinate system. How to crop the given image in Python OpenCV so that the resulting image has width * height size? Here’s an example of how the original image … Read more
You may have seen an import statement from . import your_module with the dot after the from keyword: What Does the Dot Mean? In Python, modules are defined in packages. If you want to import a certain module within a package that may be hierarchically structured, you need to specify the path of your module. … Read more
Having looked at the Python date and datetime modules in previous articles, today we’ll take a closer look at the time module and understand how to extract, input, and work with times in our coding. First, I’ll recap on computer time and introduce the time object we’ll be using with the functions we introduce later … Read more
You’d like to add text to your plot, perhaps to explain an outlier or label points. Matplotlib‘s text method allows you to add text as specified coordinates. But if you want the text to refer to a particular point, but you don’t want the text centered on that point? Often you’ll want the text slightly … 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
Problem Formulation Given a single Bitcoin address in the form of a stream of characters such as the address of the first “Genesis” block ever created on the Bitcoin blockchain: 12c6DSiU4Rq3P4ZxziKxzrL5LmMBrzjrJX How to get all transactions for this BTC address in a Python script? Solution To get all transactions of a given Bitcoin address, import … Read more
Problem Formulation Say, you have a given URL stored as a string in your Python script. You know that if you’d call get url, the server returns a JSON object. How to get the JSON object from a given URL in Python? Solution with urllib and json Modules You can get the JSON object from … Read more
Problem Formulation Say, you want to get the current price of a cryptocurrency using Python’s inofficial binance API. How do you do this for a precise point in time? Step 1: Install Python Binance with pip If you haven’t already, install the Python Binance API using the pip package manager. Run pip install python-binance in … Read more