What is the output of this code snippet? Recursion is a powerful tool in your coding toolbox. Understanding it is a key skill on your path to mastery. Stephen Hawking used a concise explanation: “to understand recursion, one must first understand recursion.” This puzzle uses indirect recursion where a function f calls a function g … Read more
Summary: Download a file over the web by using the following steps in Python. Import libary requests Define URL string Get file data from URL Store file data in file object on your computer Here’s how you can do this to download the Facebook Favicon (source): At the beginning of our struggle with web scraping, … Read more
The histogram is one of the most important plots for you to know. You’ll use it every time you explore a dataset. It is the go-to plot for plotting one variable. In this article, you’ll learn the basics and some intermediate ideas. You’ll plot histograms like a pro in no time using Python and matplotlib. … Read more
Summary: To read inputs from a user and convert it to an integer, use the command int(input(‘Prompt’)) for Python 3 and input(‘Prompt’) for Python 2. To convert the user input to a float value, use float(input(‘Prompt’)). As a programmer, user input is one of the major components of your program if you want to make … Read more
Python provides fantastic string formatting options, but what if you need greater control over how values are presented? That’s where format specifiers come in. This article starts with a brief overview of the different string formatting approaches. We’ll then dive straight into some examples to whet your appetite for using Python’s Format Specification Mini-Language in … Read more
Problem: Given two variables a and b. Use a single line of Python code to swap the variables to assign the value of a to b and the value of b to a. Example: Say, you have to integers a=21 and b=42. You want to swap the variables so that a=42 and b=21. How to … Read more
Problem: How to perform one-line if conditional assignments in Python? Example: Say, you start with the following code. You want to set the value of x to 42 if boo is True, and do nothing otherwise. Let’s dive into the different ways to accomplish this in Python. We start with an overview: Exercise: Run the … Read more
To create a variable number of variables in Python, either use a dictionary or a namedtuple. Problem: How can you store variable number of variables in your Python code? Example: Consider that there is a requirement wherein you have to store the specifications of a product in a single variable which includes a variable … Read more
Summary: To accept valid inputs from the user either use a While Loop With Custom Validations or use the PyInputPlus module to avoid tedious validation definitions. You can also use recursion to prompt the user for entering the valid input. Overview Problem: Given a user input; accept the input only if it is valid otherwise … Read more
Do you want to one-linerize the append() method in Python? I feel you—writing short and concise one-liners can be an addiction! 🙂 This article will teach you all the ways to append one or more elements to a list in a single line of Python code! Python List Append Let’s quickly recap the append method … Read more
This article answers a number of questions how to accomplish different things with a Python array in one line. By studying these questions, you’ll become a better coder. So, let’s roll up your sleeves and get started! 🙂 Python One Line Print Array If you just want to know the best way to print an … Read more
To test multiple variables x, y, z against a value v, use the set membership operation v in {x, y, z} that leverages the in keyword to check if the value v matches any value in the set {x, y, z}. The return value is a Boolean and the runtime complexity is O(1) to check … Read more