Behavioral patterns

Behavioral patterns are intended to simplify the interactions between classes by structuring the processes of their interaction.

This section provides three examples of popular behavioral patterns that you may want to consider when writing Python code:

• Observer
• Visitor
• Template

Let's examine these three examples in the next sections.

Observer

The observer pattern is used to notify a list of objects about a state change of the observed component. We have already discussed this pattern briefly in the previous chapter, but here we will discuss some practical examples of a situation where this pattern could be applied.

For instance, let's imagine we have an application that stores marketing materials...