Problem Formulation and Solution Overview In this article, you’ll learn how to extract data from List elements in Python. To make it more fun, we have the following running scenario: The Finxter Academy has been keeping tabs on an up-and-coming stock, MediTech. Each Sunday, the prices for the previous week are updated and saved to … Read more
Problem Formulation 💬 Challenge: Given an integer n. How to create a list of n empty strings ” in Python? Here are three examples: Given n=0. Create list []. Given n=3. Create list [”, ”, ”]. Given n=5. Create list [”, ”, ”, ”, ”]. Method 1: List Multiplication You can create a list of … Read more
To create an empty list in Python, you can use two ways. First, the empty square bracket notation [] creates a new list object without any element in it. Second, the list() initializer method without an argument creates an empty list object too. Both approaches are shown in the following code: Next, you’ll learn many … Read more
Problem Formulation What is the most Pythonic way to convert a CSV file to a list of dictionaries, a list of tuples, and a list of lists? Let’s go over those challenges one by one. 💫 Note: I only show you the most Pythonic solution to each problem — based on my personal opinion — … Read more
Problem Formulation Given a CSV file (e.g., stored in the file with name ‘my_file.csv’). INPUT: file ‘my_file.csv’ 9,8,7 6,5,4 3,2,1 Challenge: How to convert the CSV file to a list of tuples, i.e., putting the row values into the inner tuples? OUTPUT: Python list of tuples [(9, 8, 7), (6, 5, 4), (3, 2, 1)] … Read more
Summary: The most Pythonic approach to divide each element in a list is to use the following list comprehension: [element/divisor for element in given_list]. Read ahead to discover numerous other solutions. Problem: How to divide each element in a list and return a resultant list containing the quotients? Example: li = [38, 57, 76, 95, … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to find the 2nd largest List element in Python. To make it more fun, we have the following running scenario: Rivers Clothing is currently reviewing its projected earnings for the next six (6) months. As their IT Specialist, you saved this data in a … Read more
In this article, you’ll learn about the following topics: List unpacking in Python Tuple unpacking in Python String unpacking in Python ValueError: too many values to unpack (expected k) ValueError: not enough values to unpack (expected x, got y) Unpacking nested list or tuple Unpacking underscore Unpacking asterisk Sequence Unpacking Basics Python allows you to … Read more
Python has list comprehension and dictionary comprehension as a concise way to create a list or a dictionary by modifying an existing iterable. Python also has generator expressions that allow you to create an iterable by modifying and potentially filtering each element in another iterable and passing the result in a function, for instance. Does … Read more
Summary: The most pythonic approach to add two lists element-wise is to use zip() to pair the elements at the same positions in both lists and then add the two elements. Here’s a quick look at the solution: [x + y for x, y in zip(li_1, li_2)]. An alternate proposition to this without using zip: … Read more
💬 Question: Given a list of lists such as [[1, 2], [3, 4]]. How to convert it to a tuple of tuples such as ((1, 2), (3, 4))? If you’re in a hurry, here’s the most Pythonic way to convert a nested list to a nested tuple: Use a generator expression with the built-in tuple() … Read more
💬 Question: Given a tuple of tuples such as ((1, 2), (3, 4)). How to convert it to a list of lists such as [[1, 2], [3, 4]]? If you’re in a hurry, here’s the most Pythonic way to convert a nested tuple to a nested list: The list comprehension statement [list(x) for x in … Read more