Python provides three ways to stop a for loop: The for loop ends naturally when all elements have been iterated over. After that, Python proceeds with the first statement after the loop construct. The keyword break terminates a loop immediately. The program proceeds with the first statement after the loop construct. The keyword continue terminates … Read more
Basic Solution To create a set of n elements, pass a list or another iterable of n initial elements into the set() function. For example, set(range(n)) creates the set of n consecutive integers {1, 2, …, n-1}. You can then add and remove the elements using the normal set methods such as add() or pop(). … Read more
💬 Challenge: Given a Pandas DataFrame. How to find the longest string in a given DataFrame column? We’re going to discuss different variants of this problem next. Let’s get started with the easiest next! Method 1: Find Length of Longest String in DataFrame Column To find the length of the longest string in a DataFrame … Read more
Problem: Given a dictionary and a filter condition. How to filter a dictionary by … … key so that only those (key, value) pairs in the dictionary remain where the key satisfies the condition? … value so that only those (key, value) pairs remain where the value satisfies the condition? In this tutorial, you’ll learn … Read more
Problem Formulation and Solution Overview This article will show you how to get a random entry from a Dictionary in Python. To make it more interesting, we have the following running scenario: 👨🏫 The Plot: Mr. Sinclair, an 8th great Science Teacher, is giving his students a quiz on the first 25 Periodic Table elements. … Read more
Problem Formulation and Solution Overview This article will show you how to add days to a Pandas DataFrame Date column. To make it more interesting, we have the following running scenario: CheckersTV is a new channel offering streaming news and games. They have a large subscriber base, each paying a monthly fee of $12.99. For … Read more
Problem Formulation and Solution Overview This article will show you how to find the most common element in a Pandas Column. To make it more interesting, we have the following running scenario: You have been provided with a downloadable CSV file containing crime statistics for the San Diego area, including their respective NCIC Crime Codes. … Read more
The most Pythonic way to convert a list of floats fs to a list of strings is to use the one-liner fs = [str(x) for x in fs]. It iterates over all elements in the list fs using list comprehension and converts each list element x to a string value using the str(x) constructor. This … Read more
(Reading time: 19 minutes) The purpose of this article is to help you refresh your knowledge of all the basic Python keywords, data structures, and fundamentals. I wrote it for the intermediate Python programmer who wants to reach the next level of programming expertise. The way of achieving an expert level is through studying the … Read more
A not-so-fictious problem: Say, you’ve created a web application that runs on a dedicated Linux server in the cloud. Thousands of users visit your web app and suddenly … it crashes. Your users start complaining, and you lose revenue. More importantly, you bleed credibility by the hour. Your server is down, so what do you … Read more
Problem Formulation and Solution Overview This article will show you how to find DataFrame row indices in Python with NaN or Null (empty) values. To make it more interesting, we have the following scenario: Rivers Clothing has given you a CSV file that requires a clean-up to make it usable for Payroll and Data Analysis. … Read more
Use the tuple concatenation operation * with a tuple with one element (42,) as a right operand and the number of repetitions of this element as a left operand. For example, the expression (42,) * n creates the tuple (42, 42, 42, 42, 42) for n=5. Let’s play with an interactive code shell before you’ll … Read more