Problem Formulation: How to insert an element at the first position of a list in Python? Solution: Use the list.insert(0, x) element to insert the element x at the first position 0 in the list. All elements j>0 will be moved by one index position to the right. You create the list [5, 1, 3, … Read more
Do you train for your upcoming coding interview? This question was asked by Google as reported in multiple occasions by programmers all around the world. Can you solve it optimally? Let’s dive into the problem first. Problem Formulation Given an integer array or Python list nums and an integer value k. Find and return the … Read more
Iterables and iterators are everywhere in Python. We usually aren’t aware of the iterators because the syntax of python hides them from us. Almost every time we manipulate a sequence type (strings, lists, tuples, sets, arrays, etc.), we’re using an iterator behind the scenes. An iterable represents a sequence of values each of which is … Read more
When mentally approaching this problem, you may be tempted to utilize a “for loop”. I admit that’s how my mind was working: iterate through the list one element at a time and check for empty strings. If it’s empty, remove it. Repeat. Please join me in today’s topic on how to remove empty strings from … Read more
A couple of years ago, I fell into the habit of creating cheat sheets when exploring certain areas in the programming space. Over time, hundreds of thousands of Finxters have downloaded and used them in their own learning journeys. However, the cheat sheets are largely scattered around many different locations on the Finxter ecosystem. And … Read more
In this tutorial you will learn how to implement a simple Python program to detect if a linked list consists of a cycle or not. If you need a brief refresher on linked lists, do check out this blog post. Definition of a Cycle in a Linked List A linked list can consist of a … Read more
A common problem people often run up against in Python is understanding a method to sort one list based on the values in another. There are many solutions to this but I will select three main methods, one of which uses well-understood Python built-in functions such as zip() and sorted(). One will use the dictionary … Read more
Summary: This blog explains the ways to apply a given function to each element of a list. The best way to apply a function to each element of a list is to use the Python built-in map() function that takes a function and one or more iterables as arguments. It then applies the function to … Read more
There comes a time in all our coding lives when we need to compare lists to understand whether items in one list appear in a second list. In this article we’ll start where we all started, using for-loops, before moving to a more classic Python list comprehension. We’ll then move beyond that to use Python … Read more
The most Pythonic way to convert a list of strings to a list of ints is to use the list comprehension [int(x) for x in strings]. It iterates over all elements in the list and converts each list element x to an integer value using the int(x) built-in function. This article shows you the simplest … Read more
The most Pythonic way to convert a list of strings to a list of floats is to use the list comprehension floats = [float(x) for x in strings]. It iterates over all elements in the list and converts each list element x to a float value using the float(x) built-in function. This article shows you … Read more
The most Pythonic way to convert a list of integers ints to a list of floats is to use the list comprehension expression floats = [float(x) for x in ints]. It iterates over all elements in the list ints using list comprehension and converts each list element x to a float value using the float(x) … Read more