This tutorial is drawn from my book The Art of Clean Code (NoStarch 2022): Write Clean & Simple Code Story: I learned to focus on writing clean code the hard way. One of my research projects during my time as a doctoral researcher in distributed systems was to code a distributed graph processing system from … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to reverse a Dictionary in Python. To make it more fun, we have the following running scenario: We have a Python Dictionary containing three (3) users who are signed up at the Finxter Academy. The current key:value pairs consist of username:id. The owner would … Read more
Problem Formulation Say, you want to find a regex pattern in a given string. You know the pattern exists in the string. You use the re.match(pattern, string) function to find the match object where the pattern matches in the string. 💬 Problem: The Python regular expression pattern is not found in the string. The pattern … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to print the contents of a List without surrounding brackets in Python. To make it more fun, we have the following running scenario: You are a student and need to memorize the first 10 elements in the Periodic Table. This data is currently saved … Read more
What is Data Cleaning? Data cleaning describes the process of turning messy data into clean datasets that can be used for research and data science purposes. For example, tidy data will be in a wide format: every column contains a variable, and every row contains one case. Also, data cleaning means getting rid of corrupt … Read more
Today, I stumbled upon this beautiful regex problem: Given are a multi-line string and a regex pattern. How to find all lines that do NOT contain the regex pattern? I’ll give you a short answer and a long answer. The short answer: Use the pattern ‘((?!regex).)*’ to match all lines that do not contain regex … Read more
Problem Formulation and Solution Overview This article will show you how to count duplicates in a Pandas DataFrame in Python. To make it more fun, we have the following running scenario: Rivers Clothing has a CSV containing all its employees. However, their CSV file has more rows than employees. This is a definite problem! They … Read more
Are you frustrated coding dummy projects in order to learn Python? This article gives you 20 highly practical code projects that you can solve by yourself. Learn while you earn to improve your skills! If you want to learn about how much money you can expect to earn as a Python freelancer, grab your free … Read more
Problem Formulation and Solution Overview In this article, you’ll learn how to check a List for Duplicates in Python. To make it more fun, we have the following running scenario: The Finxter Academy has given you an extensive list of usernames. Somewhere along the line, duplicate entries were added. They need you to check if … Read more
To update a key in a dictionary if it doesn’t exist, you can check if it is present in the dictionary using the in keyword along with the if statement, and then update the key-value pair using subscript notation or update() method or the asterisk * operator. This approach will be examined in Section 1 … Read more
💬 Question: Say you have an expression you want to execute using the exec() function. How to store the result of the expression in a Python variable my_result? Before I show you the solution, let’s quickly recap the exec() function: Recap Python exec() Python’s exec() function executes the Python code you pass as a string … Read more
💬 Question: Say you have an expression you want to execute using the eval() function. How to store the result of the expression in a Python variable my_result? Before I show you the solution, let’s quickly recap the eval() function: Recap Python eval() Python eval(s) parses the string argument s into a Python expression, runs … Read more