ChrisProblem Formulation Every Python object is of a certain type, also called “class”. The class is a blueprint that shows the data and capabilities of each object/instance that is created after this blueprint. Given a Python object (=instance). How to determine/check/get its type (=class)? There are many variants of this question: How to determine the … Read more
Problem Formulation: Given a list of elements in Python. How to get the number of elements in the list? Examples: List Number of Elements [3, 42, 2] 3 [] 0 [‘Alice’, ‘Bob’, ‘Carl’] 3 [(1, 2), [3, 4]] 2 Method 1: len() The most Pythonic way to get the number of list elements is Python’s … Read more
Do you belong to the top 50% of Python coders? This article poses you 10 intermediate-level Python puzzles to test yourself. By solving all 10 Python puzzles and tracking your success rate, you will discover your exact Python skill level. The Method We Used to Measure Your Skills with Python Puzzles The idea of solving … Read more
The idea I’m going to tell you is well-researched but little-known. And it’s meta. Thinking about it has become my main passion, life mission, and purpose. It’s how I see the world. In short: what drives me is increasing collective intelligence. Collective Intelligence is Everywhere You are not one individual but many individual cells that are … Read more
Problem Formulation Given a string in hexadecimal form: How to convert the hex string to an integer in Python? For example, you want to convert the hexadecimal string ‘0xff’ to the decimal integer 255. Here are a few other examples: 0x0 –> 0 0x4 –> 4 0x8 –> 8 0x12 –> 18 0x16 –> 22 … Read more
Problem Formulation You use NumPy’s np.nanmedian() function in your code that is supposed to ignore NaN values when computing the mean of a NumPy array. But when using it, NumPy raises a RuntimeWarning: All-NaN slice encountered message: What is the reason for this warning and how to fix it? Solution + Explanation The reason this … Read more
Problem Formulation You use NumPy’s np.nanmean() function in your code that is supposed to ignore NaN values when computing the mean of a NumPy array. But when using it, NumPy raises a RuntimeWarning: Mean of empty slice message: What is the reason for this warning and how to fix it? Solution + Explanation The reason … Read more
Being hated by newbies, experienced Python coders can’t live without this awesome Python feature. In this article, I give you everything you need to know about set comprehensions using the bracket notation {}. What is Set Comprehension? Set comprehension is a concise way of creating sets in Python using the curly braces notation {expression for … Read more
This tutorial shows you how to perform simple HTTP get requests to get an HTML page from a given URL in Python! Problem Formulation Given a URL as a string. How to extract the HTML from the given URL and store the result in a Python string variable? Example: Say, you want to accomplish the … Read more
Alexa is on the way to lead the next wave of technological disruption. Have you ever asked yourself about the exact steps needed to create an Alexa Skill? And how these steps interplay with each other? To answer these questions, I give you a quick overview of Alexa Skill development in Python. This article serves … 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 PIL so that the resulting image has width * height size? Here’s an example of how the original image … Read more
Problem Formulation Given the path to a text file such as /path/to/file.txt. How to read all the content from the file and print it to the Python standard output? Standard File Reading and Printing The standard approach to read the contents from a file and print them to the standard output works in four steps: … Read more