Python’s built-in isinstance(object, class) function takes an object and a class as input arguments. It returns True if the object is an instance of the class. Otherwise, it returns False. Instead of a class, you can also pass a tuple of classes to check if the object is an instance of any of the classes … Read more
Problem: Given a dictionary in Python; how to switch Keys and Values? Method 1: Using a for loop Method 2: Using the zip function Method 3: Using the map and reverse functions Method 4: Using a dictionary comprehension Summary: Use one of the following methods to switch between the keys and values in a dictionary with unique values. … Read more
Problem Formulation: Given a Python object. How to check if the given Python object is of type list? Example: Given a dictionary for which you don’t know the values associated to the keys. For example, suppose you have entry dict[key] for which you don’t know the type. How to check if it’s a list? Given: … Read more
Problem Formulation: Given a byte string that contains new-line characters ‘\n’. How to split the byte string into a list of lines? Example: You want to transform the byte string b’your\nbyte\nstring’ into the list of byte strings [b’your’, b’byte’, b’string’] using b’\n’ as a newline separator. Given: b’your\nbyte\nstring’ Goal: [b’your’, b’byte’, b’string’] Solution: To split … Read more
This article deals with calculating percentiles. Percentiles are statistical indicators that are used to describe specific portions of a sample population. The following sections will explain what percentiles are, what they are used for and how to calculate them, using Python. As you will see, Python allows solving this problem in multiple ways, either by … Read more
Hey Finxters! It is time for another article on Python and one of its libraries. In this article I want to present to you the best Python tutorials on the Requests Library. These tutorials are a great way to get started in building your portfolio, and your Python skills as a developer. Without any hesitation, … Read more
Python’s built-in frozenset() function creates and returns a new frozenset object. A frozenset is an immutable set—so you cannot change the frozenset after creation and set methods such as add() or remove() don’t work on the frozenset. Without an argument, frozenset() returns an empty frozenset. With the optional argument, frozenset(iter) initializes the new frozenset with … Read more
Problem Formulation: Given an integer number. How to convert the integer to a string representation for printing or other use that has thousand separators? Example: Given an integer number 1000000. You want the string representation ‘1,000,000’. Method 1: f-Strings Using the modern f-strings is, in my opinion, the most Pythonic solution to add commas as … Read more
“Readers are leaders.” Many Finxters seek mentorship—and write in asking me for book recommendations. I read about one business or programming book per week and this simple habit has completely transformed my life. In this article, I’ve compiled my top list of business and programming books—ordered by how great I think the book is. All … Read more
Problem Formulation: Given a file yourPackage.whl that resides in the folder C:\your\folder\. How to install it on your Windows machine? Background .whl Files A .whl file (read: wheel file) is a zip archive that contains all the files necessary to run a Python application. What is a wheel? It’s a built-package format for Python, i.e., … Read more
Hey Finxters! It is time for another cheat sheet for Python! As we all know too well, Python is super flexible and used in data science which requires a ton of math resources to be available to us since we cannot memorize all of the mathematical equations necessary. So, I have found the top 10 … Read more
Python’s built-in set() function creates and returns a new set object. A set is an unordered collection of unique elements. Without an argument, set() returns an empty set. With the optional argument, set(iter) initializes the new set with the elements in the iterable. Read more about sets in our full tutorial about Python Sets. Usage … Read more