Git Stash
Stashing lets you save your code for later in a Git repository. When you’re working with a Git repository, you may make changes to a file that you want to apply to a Git commit later on. That’s where the…
Git Pull
The git pull command retrieves and downloads the contents of a repository to your local machine. Your local repository is updated so that it shows the content from the remote repository. You’ll probably encounter situations where you want to fetch…
Enumerate Python: Step-by-Step Guide
The Python enumerate() function adds a counter to an iterable object. The counter lets you keep track of how many iterations have occurred. This counter is stored as a separate variable. The Python programming language has several useful features that…
JavaScript For Loop: A Step-By-Step Guide
A JavaScript for loop executes a block of code as long as a specified condition is true. JavaScript for loops take three arguments: initialization, condition, and increment. The condition expression is evaluated on every loop. A loop continues to run…
Git Init: A Step-by-Step Guide
The Git init command creates a new Git repository. The init command sets up all the configuration files you need to work with git in a folder called .git/. You only need to run the git init command once. When…
Git Merge
Merging lets developers bring their changes onto an individual line of development. To merge two branches, you can use the git merge command. Once you run this command, the changes from one branch are merged into the branch you are…
Git Clone
The git clone command creates a copy of a remote repository on your local machine. By default, the clone command saves your code in a folder that shares the name of your repository. This can be overwritten by specifying a…
Git Fetch: A Step-By-Step Guide
The git fetch command downloads all branches, tags, and data from a project to the local machine. Existing local code is not overwritten. Fetch is commonly used with the git reset command to bring a local repository up to date…
7 Reasons Why You Should Learn Ruby on Rails
If you’ve spent any time reading about the Ruby programming language, it’s likely you have heard the term ‘Ruby on Rails’ at some point. You may be asking yourself the question “should I learn Ruby on Rails?” This language has…
Python NameError: name ‘xrange’ is not defined Solution
In Python 3, the xrange function was removed. If you try to use the xrange function in a Python 3 program, you’ll encounter the NameError: name ‘xrange’ is not defined error. In this guide, we’re going to discuss what this…
Python Substring: A Step-By-Step Guide
A Python substring is a portion of text taken from a string. You can extract a substring in Python using slicing, with the format: YourString[StartingIndex:StoppingIndex:CharactersToSkip]. Often, programmers have data that they want to split up into different parts. For example,…
Python PermissionError: [errno 13] permission denied Solution
Python can only open, read from, and write to files if an interpreter has the necessary permissions. If you try to open, read from, or write to a file over which Python has no permissions, you’ll encounter the PermissionError: [errno…
What is a Git HEAD?
You’ll encounter the term “HEAD” as you use Git, no matter what commands you run. You’ll find this term widely used throughout the Git documentation. What does it mean? In this guide, we’re going to answer that question. We’ll discuss,…
Python beyond top level package error in relative import Solution
You can import packages relatively inside a Python project. If you make a mistake in importing a package relatively, you’ll encounter the beyond top level package error in relative import error. In this guide, we’re going to discuss what this…
Download a Single File from GitHub: A Guide
When you clone or pull a Git repository, the entire contents of that repository are downloaded by default. Git does not allow you to download part of a repository. Using GitHub, you can download one file from a Git repository.…
Git: Force Pull
Git prevents you from pulling files to your local machine if any unsaved or untracked changes would be overwritten by the merge operation. You can use the force pull method to force Git to pull the changes you want to…
ID vs Class CSS: Understanding the Differences
When comparing CSS class vs ID, the difference is that CSS class applies a style to multiple elements. ID, on the other hand, applies a style to one unique element. ID is also special in that you can use a…
Python pip: command not found Solution
pip allows you to download packages you can reference in your Python code. If you try to install a package using pip without having the package manager installed on your computer, you’ll encounter the pip: command not found error. In…
Git xcrun: error: invalid active developer path Solution
Git relies on various dependencies within Apple’s Xcode command line tools to function. If you do not have Xcode Tools installed on your system, you’ll encounter the xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools) when you try to run a…
Git: Restore Deleted File
Git keeps a log of all the changes made to files within a repository. You can restore a file that you have deleted since a previous commit by using the git checkout command. This command lets you navigate to a…
Python SyntaxError: cannot assign to operator Solution
You cannot assign the result of a calculation to a mathematical operator. If you perform a calculation before an assignment operator appears on a line of code, you’ll encounter the SyntaxError: cannot assign to operator error. In this guide, we…
JavaScript Uncaught TypeError: cannot set property ‘innerHTML’ of null Solution
The innerHTML property lets you set the contents of an element using JavaScript. If you specify an invalid element with which to use the innerHTML method, or if you place your script before the element appears on the page, you’ll…
querySelector vs. getElementById: A Comparison
Both the querySelector and getElementById methods let you retrieve an element from the JavaScript Document Object Model (DOM). However, each method has its own use cases. In this guide, we break down the most common use case of both querySelector…
Python pip install invalid syntax Solution
The pip package installer must be run from the command line. If you try to install a package from the Python interpreter or in a Python program, you’ll encounter the SyntaxError: invalid syntax error. In this guide, we’re going to…
JavaScript SyntaxError: missing ) after argument list Solution
JavaScript relies on brackets to know where function calls start and end. If you miss out a piece of syntax before a function is closed, you’ll encounter the “SyntaxError: missing ) after argument list” error. This guide explores what this…
Python NameError: name ‘raw_input’ is not defined Solution
Python 3 has replaced Python 2’s raw_input() method with the input() method. If you try to use raw_input() in Python 3, you’ll encounter the NameError: name ‘raw_input’ is not defined error. In this guide, we’re going to discuss what this…
JavaScript document.getElementByID is not a function Solution
The JavaScript getElementById method selects an element from the HTML Document Object Model (DOM). If you incorrectly spell this method, you’ll encounter the document.getElementByID is not a function error in your program. This tutorial discusses what this error means and…
Git Detached HEAD Explanation
A detached HEAD occurs when you check out a commit that is not a branch. The term detached HEAD tells you that you are not viewing the HEAD of any repository. The HEAD is the most recent version of a…
Python Exceptions: A Guide
Exceptions can be raised by the Python interpreter and manually. Built-in exceptions help catch common errors in a program. In this guide, we’re going to discuss what an exception is and how they are used. We’ll walk through an example…
Create Folder in GitHub: A Guide
There is no Git feature that supports the creation of an empty folder. To create a folder in Git, you must commit a folder to a repository that contains at least one file, even if that file is hidden. In…
