Problem Formulation Given a filename and an integer n. How to read the first n lines of the file in your Python script? Here’s an overview of the solutions: Method 1: Store Head in a List of Strings To read the first n lines of a given file and store each line in a list … Read more
We live in a world that relies on data, massive amounts of data. This data is used in many areas of business, for example: Marketing & sales Competition research Lead generation Content aggregation Monitoring consumer sentiment Data Analytics and Data science AI Machine learning Real Estate Product and price data Much of this data is … Read more
Problem Formulation Given a JSON object stored in a file named “your_file.json” such as a list of dictionaries. 💬 How to append data such as a new dictionary to it? # File “your_file.json” (BEFORE) [{“alice”: 24, “bob”: 27}] # New entry: {“carl”: 33} # File “your_file.json” (AFTER) [{“alice”: 24, “bob”: 27}, {“carl”: 33}] Method 1: … Read more
The last 100 years have been economically dominated by corporations. Corporations have brought us health, wealth, and wisdom. Corporations organized the invention and distribution of drugs that saved billions of lives. Corporations took care of automation and efficiency gains and subsequently made billions of people live lives in prosperity and wealth — an average worker … Read more
Problem Formulation Given a TensorFlow variable created with tf.Variable(). As this variable may have changed during the training process (e.g., using assign()), you want to get the current value of it. How to accomplish this in TensorFlow? Sessions Are Gone in TensorFlow 2 In TensorFlow 1, computations were performed within Sessions. That’s why many people … Read more
This article deals with signal processing. More precisely, it shows how to smooth a data set that presents some fluctuations, in order to obtain a resulting signal that is more understandable and easier to be analyzed. In order to smooth a data set, we need to use a filter, i.e. a mathematical procedure that allows … Read more
Scikit-learn has a library of transformers to preprocess a data set. These transformers clean, generate, reduce or expand the feature representation of the data set. These transformers provide the fit(), transform() and fit_transform() methods. The fit() method identifies and learns the model parameters from a training data set. For example, standard deviation and mean for … Read more
Problem Formulation Given an integer number n. Get all divisors c of the number n so that c * i = n for another integer i. The desired output format is a list of integers (divisors). Here are a couple of examples: n = 10 # Output: [1, 2, 5, 10] n = 13 # … Read more
Method overriding vs overloading in Python—what’s the difference? If you’re short on time—here it is: Method overloading: creating a method that can be called with different arguments such as m() and m(1, 2, 3). Method overriding: overwriting the functionality of a method defined in a parent class. In method overloading, methods in a given class … Read more
[toc] ? This is one of the Google interview questions and reported by programmers across the globe as one of the commonly asked questions during interviews. So, can you give the optimal solution to this problem? Problem Formulation Given an integer array or Python list nums, an integer value x and k. Find and return … Read more
Hacking Alexa’s Voice Recordings After David’s mother passed away, he wanted to hear her voice again. As she used Amazon Alexa, he figured, he could download the voice recordings from the Alexa device. But Amazon didn’t provide an interface for it. Fortunately he found this project online: [Cool Project] Hacking Alexa’s Voice Recordings After following … Read more
Problem Formulation The following problem formulation is taken from this Kata. Design a recursive function called replicate(times, number) that returns an array of repetitions of the number argument. For example, replicate(3, 5) should return the list [5, 5, 5]. If the times argument is negative, return an empty array. Do not use loops to solve … Read more