This article addresses two problems: Given is a dictionary and a single key. How to get the length of the value associated with the key in the dictionary? Given is a dictionary. How to get the total length, summing over the length of all values in the dictionary? Let’s dive into these two problems and … Read more
In this post, we will go through the basics of Min-Max scaler. Also, we will focus on how to scale specific columns in Pandas DataFrame. What is a Min-Max Scaler? Min-Max scaling is a normalization technique that enables us to scale data in a dataset to a specific range using each feature’s minimum and maximum … Read more
The Pandas DataFrame/Series has several methods related to time series. Preparation Before any data manipulation can occur, two (2) new libraries will require installation. The Pandas library enables access to/from a DataFrame. The NumPy library supports multi-dimensional arrays and matrices in addition to a collection of mathematical functions. To install these libraries, navigate to an … Read more
The day will come. You have developed your first app and you’re looking for customers. Congratulations your app is open to the world! But there’s a problem. Not only your customers but your competition can see it too! And make no mistake: they will come and they will take it if you don’t do anything … Read more
Problem Formulation Say you need to call a potentially long function but you can only wait for a fixed time duration for the function to terminate. If the function does terminate within the time interval, you take the function’s return value. If the function does not terminate within the time interval, you want to take … Read more
The Pandas DataFrame/Series has several methods to combine/compare/join and merge the data. Preparation Before any data manipulation can occur, two (2) new libraries will require installation. The Pandas library enables access to/from a DataFrame. The NumPy library supports multi-dimensional arrays and matrices in addition to a collection of mathematical functions. To install these libraries, navigate … Read more
Problem Formulation Given a Python iterable such as a list or a string that can be accessed via slicing. How to use the slicing operation iter[start, stop, step] so that for given values for start, stop, and step the output is an iterable (slice) containing only the first and the last element of the iterable? … Read more
NaN stands for Not A Number. It is a placeholder to indicate the absence of value. One can think of it as a None or 0. It’s just that None or 0 belongs to a specific type. However, NaN doesn’t. We use NaN to represent missing data or the failure to perform some operation. While … Read more
This article shows you how to apply a given function to each element of a Python dictionary. The most Pythonic way to apply a function to each element of a Python dict is combining the dictionary comprehension feature and the dict.items() method like so: {k:f(v) for k,v in dict.items()} Note: All the solutions provided below … Read more
Today I want to propose a new habit for you which will ensure that you are on the path of continuous improvement in Python — on the path to mastery. Did you read the book “The Power of Habit” by Charles Duhigg? This Keystone Habit changed her life… The Pulitzer-Price-winning author talks about forming so-called … Read more
This article shows you how to apply a given function to each element of a tuple. The best way to apply a function to each element of a tuple is the Python built-in map(function, iterable) function that takes a function and an iterable as arguments and applies the function to each iterable element. An alternate … Read more
The Pandas DataFrame/Series has several methods to re-shape, sort, and transpose the data. Preparation Before any data manipulation can occur, two (2) new libraries will require installation. The Pandas library enables access to/from a DataFrame. The Xarray library works with labeled multi-dimensional arrays and advanced analytics. To install these libraries, navigate to an IDE terminal. … Read more