Practical Python Design Patterns22 Interpreter Pattern CHAPTER Interpreter Pattern Silvia Broome: What do you do when you can t sleep? Tobin Keller: I stay awake. e Interpreter Sometimes it makes sense to not use Python to describe a problem or the solution to such a problem. When we need a language geared toward a specific problem domain, we turn to something called a domain-specific language. Domain-Specific Languages Some languages, like Python, .. 2023. 3. 28. Command Pattern CHAPTER 11 Command Pattern I ll be back. Terminator The robots are coming. In this chapter, we are going to look at how we can control a robot using Python code. For our purposes, we will be using the turtle module included in the Python standard library. This will allow us to handle commands like move forward, turn left, and turn right without the need to build an actual robot, although you sho.. 2023. 3. 28. Chain of Responsibility Pattern CHAPTER Chain of Responsibility Pattern It wasn t me. Shaggy, It Wasn t Me Web apps are complex beasts. They need to interpret incoming requests and decide what should be done with them. When you think about creating a framework to help you build web apps more quickly, you stand a very real chance of drowning in the complexity and options involved with such a project. Python is home to many a we.. 2023. 3. 28. Proxy Pattern CHAPTER 11 Proxy Pattern Do you bite your thumb at us, sir? Abram, Romeo and Juliet As programs grow, you often find that there are functions that you call very often. When these calculations are heavy or slow, your whole program suffers. Consider the following example for calculating the Fibonacci sequence for a number n: def fib(n): if n < 2: return 1 return fib(n - 2) + fib(n - 1) This fairly.. 2023. 3. 28. Facade Pattern CHAPTER Facade Pattern e Phantom of the Opera is there, inside my mind. Christine In this chapter, we will look at another way to hide the complexity of a system from the users of that system. All the moving parts should look like a single entity to the outside world. All systems are more complex than they seem at first glance. Take, for instance, a point of sale (POS) system. Most people only e.. 2023. 3. 28. Decorator Pattern CHAPTER 7 Decorator Pattern Time abides long enough for those who make use of it. Leonardo da Vinci As you become more experienced, you will find yourself moving beyond the type of problems that can easily be solved with the most general programming constructs. At such a time, you will realize you need a different tool set. This chapter focuses on one such tool. When you are trying to squeeze ev.. 2023. 3. 28. Adapter Pattern CHAPTER 7 Adapter Pattern It is not the strongest of the species that survives, nor the most intelligent. It is the one that is most adaptable to change. Charles Darwin Sometimes you do not have the interface you would like to connect to. There could be many reasons for this, but in this chapter, we will concern ourselves with what we can do to change what we are given into something that is clo.. 2023. 3. 28. Builder Pattern CHAPTER 5 Builder Pattern Can he fix it? Yes, he can! Bob the Builder eme Song If you work in software for any amount of time, you will have to deal with getting input from the user anything from having a player enter their character name in a game to adding data to the cells on a spreadsheet. Forms are often the heart of an application. Actually, most applications are just a special case of the.. 2023. 3. 28. Factory Pattern CHAPTER 5 Factory Pattern Quality means doing it right when no one is looking. Henry Ford In Chapter 3, you started thinking about writing your own game. To make sure you don t feel duped by a text-only game, let s take a moment and look at drawing something on the screen. In this chapter, we will touch on the basics of graphics using Python. We will use the PyGame package as our weapon of choic.. 2023. 3. 28. 이전 1 2 3 다음