Chris🛑 Note: Python has zero-based indexing, i.e., the index of the first element is 0, and the index of the i-th element is (i-1). Not considering zero-based indexing but assuming the i-th element has index i is a common source of bugs! Here’s an example that demonstrates how list indexing works in Python: 🏃 Training … Read more
What is the output of this code snippet? You will use or have already used the operations introduced in this puzzle. They are elementary pieces of knowledge for any Python programmer. First, we have the two dictionaries mapping an account name to the number of followers. For example, Cristiano Ronaldo (key: “@cristiano”) has 120 million … Read more
What is the output of this code snippet? This puzzle demonstrates that parameters are called by object in Python. What does that mean? We look into two functions depreciation1 and depreciation2. The functions take an asset value or a list of asset values as inputs. They depreciate this value by multiplying it with the depreciation … Read more
To join a list of Unicode strings in Python, use the string.join(list) method on the delimiter string. For example, you can call ‘?’.join([‘⭐’, ‘?’, ‘?’]) to obtain the string ‘⭐????’. Note that per default, all strings are UTF-8 in Python which means they already are Unicode encoded. This morning—when reading a WhatsApp message during my … Read more
What is the output of this code snippet? This puzzle introduces a powerful tool for your Python toolbox. Make sure, you feel comfortable using it because many advanced puzzles depend on it. The name of the tool is indexing. In Python, you can access every character in the string by using an integer value which … Read more
What is the output of this code snippet? The majority of people solve this puzzle correctly. Even so, the first goal of this puzzle is to introduce the concept of variables. Python evaluates the result of the expression on the right side of the equation and stores it in the variable x. After defining the … Read more
What is the output of this code snippet? The Python interpreter is a powerful tool. In this puzzle, it acts as a simple calculator. It takes a basic mathematical expression and calculates the result. The syntax of maths expressions is straightforward: use the operators +, -, * and / exactly as you have learned them … Read more
The most Pythonic way to merge multiple lists l0, l1, …, ln into a list of tuples (grouping together the i-th elements) is to use the zip() function zip(l0, l1, …, ln). If you store your lists in a list of lists lst, write zip(*lst) to unpack all inner lists into the zip function. The … Read more
What is the output of this code snippet? This puzzle introduces two basic concepts. First, variables can hold strings. In fact, variables can hold any data type. The interpreter determines the data type of a variable at runtime. The data type of a variable can change: you can assign a string to a variable, followed … Read more
If the search phrase “Python Join List Range” brought you here, you’re having most likely one of the following problems: You don’t know how to concatenate two range() iterables, or You want to use .join() to create a string from a range() iterable—but it doesn’t work. In any case, by reading this article, I hope … Read more
The most efficient method to join a list of Python strings in reverse order is to use the Python code ”.join(l[::-1]). First, reverse the list l using slicing with a negative step size l[::-1]. Second, glue together the strings in the list using the join(…) method on the empty string ”. Problem: Given a list … Read more
Problem: Given two lists [1, 2, 2, 4] and [2, 5, 5, 5, 6]. How do you combine those lists to the new list [1, 2, 2, 4, 5, 6] by removing the duplicates in the second list? Note: You want to remove all duplicates in the second list and the elements in the second … Read more