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James Gallagher

Technical Content Manager

James Gallagher is a self-taught programmer and the technical content manager at Career Karma. He has experience in range of programming languages and extensive expertise in Python, HTML, CSS, and JavaScript. James has written hundreds of programming tutorials, and he frequently contributes to publications like Codecademy, Treehouse, Repl.it, Afrotech, and others.

Python Convert List to Dictionary: A Complete Guide
You can convert a Python list to a dictionary using a dictionary comprehension, dict.fromkeys(), or the zip() method. All three methods create a new dictionary. They do not modify the existing list. Python lists and dictionaries are two structures used…
Replace Item in List in Python: A Complete Guide
There are three ways to replace an item in a Python list. You can use list indexing or a for loop to replace an item. If you want to create a new list based on an existing list and make…
Python Dictionary Values: A Guide
The Python dictionary values() method returns an object containing the values in a dictionary. This method is useful if you want to iterate over only the values in the dictionary. If you change a dictionary later, the data stored in…
SQL Subquery: A Complete Guide
An SQL subquery is a query inside another query. It is used in the WHERE or HAVING clause of an SQL statement. Subqueries let you specify the results of one query as an argument in another query. When you’re writing…
SQL Aliases: A Complete Guide
An SQL alias is a reference name for a table or a column. They are used to shorten your queries if you have long table names. Both table and column aliases are defined using the AS keyword. An alias lasts…
SQL Left Join: A Complete Guide
An SQL LEFT JOIN is a type of SQL join. This join returns all the tables from a specified "left" column and the corresponding rows that match a particular condition in the "right" column. In many cases, when you’re writing…
SQL ORDER BY: A Complete Guide
The SQL ORDER BY statement determines the order in which records are returned by a query. You can return records in ascending or descending order by the value of any column in the table. Ordering query results makes it easier…
SQL INNER JOIN: A Complete Guide
The SQL INNER JOIN statement returns rows with exact values in two columns across two tables. You can join a table across one or multiple columns. JOIN statements connect two database tables and compare their contents. There may be times…
SQL Aggregate Functions: A Complete Guide
SQL aggregate functions retrieve information about the data in a database. You can use COUNT to find out how many records are in a database, for instance. Accepted aggregate functions are: COUNT, MIN, MAX, AVG, and SUM. There are occasions…
SQL Group By: A Complete Guide
The SQL GROUP BY statement appears in aggregate functions. It is used to collate the data you select from a query by a particular column. You can specify multiple columns which will be grouped using the GROUP BY statement. When…
SQL Like: A How-To Guide
The SQL LIKE operator uses wildcards to find data similar to a particular pattern. You can use an underscore to substitute for a single character or a percentage sign to substitute zero, one, or multiple characters. Have you ever wanted…
SQL Between: A Complete Guide
The SQL BETWEEN keyword retrieves values that fall within a particular set of values. It is often used to retrieve values between two dates or numbers. This keyword is used in WHERE clauses. The syntax for this keyword is: "BETWEEN…
SQL IN: A Beginner’s Guide
The SQL IN keyword lets you select values that appear in a range of values. You can specify a query inside an IN statement to search for records whose column has a value in the result of a query. The…
SQL ALTER TABLE: A Guide
The SQL ALTER TABLE statement adds, changes, or removes a column in a table. This statement lets you modify a table after it has been created, even if the table stores records. You may decide that you need to make…
SQL WHERE Statement: A How-To Guide
The SQL WHERE clause limits how many records are returned or affected by a command. It is used with the SELECT, UPDATE, and DELETE clauses. You can use the AND keyword to specify multiple conditions which you want records affected…
What is JavaScript Used For?
JavaScript is used to develop interactive web applications. JavaScript can power featured like interactive images, carousels, and forms. The language can be used with back-end frameworks like Node.js to power the mechanics behind a web page, such as form processing…
CSS Box Model: A How-To Guide
The browser uses the CSS box model to determine how an element should appear on a web page. The box model represents the size of an element and its border, padding, and margins. You can style each of these elements…
Java indexOf(): A How-To Guide
The Java indexOf() method finds the index position at which a specified string begins. This method lets you find a string within another string. If the value you specify is not present in the string through which you are searching,…
JavaScript String Contains: Step-By-Step Guide
You can check if a JavaScript string contains a character or phrase using the includes() method, indexOf(), or a regular expression. includes() is the most common method for checking if a string contains a letter or series of letters, and…
Python Move File: A Complete Guide
The Python shutil.move() method moves a file to another location on your computer. This method is part of the shutil model, which you must import before using this method. Moving files is a common operation in Python programs. For instance,…
CSS focus: A How-To Guide
The CSS :focus psuedo-class selects an element in its focus state. This happens when you click on an element or select it with the tab button. :focus comes after the name of the element you want to select. You may…
CSS Hide Element: A Step-By-Step Guide
You can hide an element in CSS using the CSS properties display: none or visibility: hidden. display: none removes the entire element from the page and mat affect the layout of the page. visibility: hidden hides the element while keeping…
Python Shuffle List: A Step-By-Step Guide
The Python random.shuffle() method changes the order of the items in a list at random. Combined with indexing, this method is useful for selecting a random item from a list. The random.shuffle() method accepts one argument: the list you want…
How to Ask Someone to Be a Reference
A lot of stress goes into the job search process. Wondering about how to ask someone to be a reference can be one of them. During your job search, you may be asked to produce a list of referees who…
CSS Nth Child: The Complete Guide
The CSS :nth-child() selector applies a style to elements at a specific position in a group. Often, the :nth-child() selector is used to style particular list items, such as every second or third item. When you’re designing a website, you…
Python Power: A Step-By-Step Guide
The ** operator and the pow() function calculate the power of a number in Python. The ** operator raises the number on the left to the power of the number on the right. The pow() function raises the first parameter…
Python Ord: A Step-By-Step Guide
The Python ord() method converts a character into its Unicode code. The ord() method takes one argument: a string containing a single Unicode character. This method returns an integer that represents that character in Unicode. You may encounter a situation…
How to Write a Python Insertion Sort
The Python insertion sort works like sorting game cards. To use the insertion sort, you create two lists: a sorted and unsorted list. You compare each item in the unsorted list until you sort that item. The insertion sort is…
How to Use the Python Modulo Operator
The Python modulo operator calculates the remainder of dividing two values. This operator is represented by the percentage sign (%). The syntax for the modulo operator is: number1 % number2. The first number is divided by the second then the…
How to Copy a List in Python
You can copy a list in Python using the copy() method, slicing, the list() method, and a list comprehension. The copy() method is the most direct way of copying a Python list. When you’re working with a list in Python,…

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