What is a Recommendation System? If you use Netflix or Amazon you have already seen the results of recommendation systems – movie or item recommendations that fit your taste or needs. So, at its core a recommendation system is a statistical algorithm that computes similarities based on previous choices or features and recommends users which … Read more
Freelancing is the new mega trend of our time. Large freelancing platforms such as Upwork and Fiverr grow double-digit—they’re out to disrupt the organization of the world’s talents. And it seems like they’re succeeding! Do you want to participate in this trend rather than only holding on to your cozy developer job as long as … Read more
Python’s dictionary data structure is one of the most powerful, most underutilized data structures in Python. Why? Because checking membership is more efficient for dictionaries than for lists, while accessing elements is easier for dictionaries than for sets. In this tutorial, you’ll learn how to perform four common dictionary operations in one line of Python … Read more
Here’s the step-by-step approach of how to deploy your Dash app on Pythonanywhere.com using Flask and pip: Create an account on Pythonanywhere.com. Create a Flask application. Create a Dash application. Copy the Dash app into the Flask app. Connect the Flask server with the Dash app. Modify the WSGI configuration file. Install Dash with pip … Read more
Problem: How to calculate the entropy with the SciPy library? Solution: Import the entropy() function from the scipy.stats module and pass the probability and the base of the logarithm into it. Try It Yourself: Run this code in the interactive code shell! Exercise: Change the probabilities. How does the entropy change? Let’s start slowly! You’ll … Read more
You may already know about Python’s capability to create a simple web server in a single line of Python code. Old news. Besides, what’s the point of creating a webserver that only runs on your machine? It would be far more interesting to learn how to access existing websites in a single line of code. … Read more
Summary: To import a module given the full path, the following methods can be used : Using the importlib module Using SourceFileLoader class Using sys.path.append() function Adding __init__ file to the folder containing the module and then importing it Problem: How to import a module if its full path has been given? Example: Consider we … Read more
You may know the following problem: You have an object’s attribute name as a string—say, you’ve read it from a file—and you want to access the attribute with the given name. But you cannot use the syntax object.”attribute” because the dot notation only allows for name-access like this: object.attribute. How do you resolve this problem? … Read more
The histogram is one of the most important plots for you to know. You’ll use it every time you explore a dataset. It is the go-to plot for plotting one variable. In this article, you’ll learn the basics and some intermediate ideas. You’ll plot histograms like a pro in no time using Python and matplotlib. … Read more
Python provides fantastic string formatting options, but what if you need greater control over how values are presented? That’s where format specifiers come in. This article starts with a brief overview of the different string formatting approaches. We’ll then dive straight into some examples to whet your appetite for using Python’s Format Specification Mini-Language in … Read more
Problem: Given two variables a and b. Use a single line of Python code to swap the variables to assign the value of a to b and the value of b to a. Example: Say, you have to integers a=21 and b=42. You want to swap the variables so that a=42 and b=21. How to … Read more
Summary: To merge two dictionaries dict1 and dict2 in a single expression, use the dictionary unpacking feature z = {**dict1, **dict2}. This creates a new dictionary and unpacks all (key-value) pairs into the new dictionary. Duplicate keys are automatically resolved by this method. Exercise: Which of the duplicated entry ends up in the dictionary? Other … Read more