Previously, when we looked at how you can work with list in Python, we looked some operators and functions. However, a list is a bit more complex, than a normal variable – as you might have already guessed, and not just because you can store more than one value in it. Python also allows you…
We also need to remember that lists are mutable, or able to be changed while the program is running. Consider the following: Being able to store data inside a list is one thing. Accessing each element, one by one, is helpful, but there is so much more that we could do. Insider of having to…
A sequence is an object which can contain multiple items of data. We can perform operations on a sequence that allow us to work with those individual items. A list, is a sequence in Python, that is mutable, meaning the data within it can be changed while the program is running. Each item in a…
In previous articles we’ve seen how to read data from a file, or write data to a file in Python. This assumed everything was working, such as the file was there, and could be opened. But that won’t always be the case. In fact, there are a lot of types of errors that can occur…
So we’ve already looked at what it takes to open a file for writing in Python, but how do actually send data to be saved, and then save that file? We’ll let’s take a look. Let’s look at a simple program which will write three (3) names to a file. First we get three names…
Opening a file in Python is actually very simple. It follows the general form of: The file_variable is the variable we will use to reference the file in the Python code. The filename includes the whole file, including path (if you are not in the same folder), and extension. The mode specifies whether you are…
Often programs needs to store information between sessions. There are several ways to do this. First is through the use of an external file. Why not just keep the data in a variable? Well data that is store in RAM (Random Access Memory) is reused. And if an application ends, the data is erased and…
So far we’ve looked at void functions, or function which execute, and exit – without returning something to the calling program/function. We’ve even looked at passing values to a function, but we often want to return a value from a function. A value-returning function will return a value back to the calling location. Think of…
