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Python Tutorials

Python ‘numpy.ndarray’ object is not callable Solution

Like any regular Python array, you can access the contents of a NumPy array using indexing. The indexing method, which uses square brackets, lets you see one item in a list or a particular part of a list. If you…

Python Check If List Is Empty

There are several ways to check if a list is empty. The first one covered below, if list returns as false, is the most pythonic. In other words, it is the one people recommend the most in Python. The other…

Python AttributeError: ‘numpy.ndarray’ object has no attribute ‘append’ Solution

In regular Python, you can use the append() method to add an item to the end of a list. You cannot use this method in NumPy. If you try to use the Python append() method to add an item to…

Python ValueError: math domain error Solution

In mathematics, there are operations which do not work on negative numbers or zero numbers. Consider the square root, for example. You cannot find the square root of a negative number. Python recognizes that not all operations work with negative…

Python ValueError: list.remove(x): x not in list Solution

You cannot remove an item from a list if it does not appear in said list. The Python error ValueError: list.remove(x): x not in list tells you the item you want to remove does not appear in the list. In this…

Python JSONDecodeError Explanation and Solution

Many developers store data from a program in a JSON file; other programs reference APIs which require working with JSON. Indeed, you will have no trouble finding a use case for JSON, or its Python equivalent, dictionaries. You may encounter…

Python FileNotFoundError: [Errno 2] No such file or directory Solution

In most cases, any file you reference in a Python program needs to exist. This is, of course, unless you are creating a new file and writing to it. If you reference a file that does not exist, Python will…

How to Use Python extend()

Let’s say that you are going to have a party, and you have a list of friends that you are going to invite. This list may grow as you think of people you want to invite.  This is where the…

Python Index: A Step-By-Step Guide

The Python index() method returns the index position at which an item is found in a list or a string. index() returns the lowest resulting index for the item. A ValueError is returned if the specified item does exist in…

Python Average: A Step-by-Step Guide

There are two ways to find the average of a list of numbers in Python. You can divide the sum() by the len() of a list of numbers to find the average. Or, you can find the average of a…

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