Search Results for: python dictionary

This article explores several ways to remove duplicate items from lists in the Python programming language. Using The dict.fromkeys() Method To Remove Duplicates From a List in Python This is the fastest way to remove duplicates from a list in Python. However, the order of the items in the list is not preserved. The fromkeys() method creates a dictionary (a collection of key:value pairs) with keys from a supplied sequence of elements (in this case, a list). As a dictionary cannot contain duplicate keys, they are removed. … Read more

A Tuple is a type of variable in Python – a data structure containing multiple parts. It’s a collection (or array) of data – but a specific kind of collection. It’s Ordered (Indexed) Elements in a tuple are stored in order – stored with an index or position – their position in the collection is fixed, and they can be found by their position. It’s Unchangeable (Or Immutable) Once a tuple is created, elements in it cannot be moved, removed, added, or altered. Duplicates are Allowed Duplicate values are allowed as tuples are indexed, so multiple elements with the same … Read more

This tutorial explains how to create loops in Python by using the “while” statement. Included below are the syntax and examples. In programming (and thus, in Python), a loop is a statement which will execute a block of code repeatedly until a condition is met, or the loop is broken out of manually. This article will look at Python Loops and conventions to use when writing them. Looping with the while statement, Syntax and Example Here is a basic loop which will increment (add 1) the variable ‘i’ … Read more

Python is widely used for both scripting and automation on Linux, as well as building web and standalone applications. Python is designed to be easy to learn, easy to write, and easy to read. It’s a great multi-purpose programming language. Boolean Values This article covers how boolean operators work in Python. In programming, a boolean value is either TRUE or FALSE. When comparing values in Python, a boolean value is returned allowing you to store the result of the comparison, or take a certain action … Read more

This tutorial will teach you how to find the length of a list (array) in Python using some code examples. There are four data structures built into Python: tuples, sets, dictionaries, and lists. They are important for programmers because they allow for iteration over their contents. When we talk about data structures such as lists in Python, we are referring to a collection data type. Lists in Python can be ordered and changed. Also, unlike the sets collection type, a list allows for duplicated entries, … Read more

Even outside of programming, people perform list reversal regularly, for example, to re-order eBay items from high to low then low to high. It is a handy operation, and Python provides several ways to accomplish it. Method 1: Using the built-in reverse() function This method has the advantage of being simple and easy to understand when using someone else’s code. For example, if we have stored our list in “staffNames”: staffNames = [“Abigail”, “Chris”, “Denise”, “Fred”] staffNames.reverse() When executed, this method doesn’t automatically give a … Read more

Let’s look at two ways you can concatenate (which is a fancy word for join or merge) two or more strings in Python. It’s also worth checking out our article on converting integers to strings in Python. A Note On Immutable Strings Strings in Python are immutable and cannot be changed once defined. This means that whenever you join two strings, a new string is created (ie. the original is not modified!). This has both performance side effects and affects how you should structure your code: … Read more

Python is widely used for both scripting and automation on Linux, as well as building web and standalone applications. Python is designed to be easy to learn, easy to write, and easy to read. It’s a great multi-purpose programming language. Python has several different types of arrays for storing data. Lists are arrays which allow you to store items. Items in lists can be altered, and are stored in a specific order. Syntax and Examples There are several methods you can use to remove an … Read more