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…
When building a site, you want consistency. It helps in the design, and makes it easier to communicate with your intended audience. You might call it repetition. The easiest way to do that is via a template. Now different development environments allow you different methods. WordPress has themes, some content management systems (CMS) call them…
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…
Now a function can read a variable from the main program inside a function, but it cannot write to that variable. This can cause some confusion, and rightly so. So lets not do that. Instead, we can change how a function behaves by passing values to a function. These values are called parameters. An argument…
Let’s first look at a void function, as they are the simplest form of function. Additionally, we’re not going to pass any variables into this function. That means, every time it is called, the exact same thing will run. The first line of our function, is called the function header. It starts with def, letting…
Functions allow us to write several lines of code, that may need to be called at different times in our code, and to call all of the code, with using just the function name, and some parameters. Sometimes functions are used to make code more readable, calling a function by a logical name, rather than…
