Factory patterns are implemented in Python using factory method. This new type of object will be called a Let’s start by looking at the application configuration:This method is used to create and initialize the concrete Finally, let’s take a look at the local service implementation:A new instance is created every time the service is requested because there is no slow authorization process. The application requires objects to be serialized to multiple formats like JSON and XML, so it seems natural to define an interface The interface implementation might look something like this:This interface is implemented by the concrete classes Let’s take a look at a concrete implementation of the So far, we’ve seen the implementation of the client (In the original example, you implemented the creator as a function. The service requires that the the location of the music collection in the local system be specified. As with Spotify, the authorization process is slow, and it should only be performed once.Finally, the application implements the concept of a local music service where the music collection is stored locally.

These type of classes are called object factories.Let’s go to the Python interactive interpreter and see how it works:The new design of Factory Method allows the application to introduce new features by adding new classes, as opposed to changing existing ones. You can serialize other objects by implementing the You want your designs to be flexible, and as you will see, supporting additional formats without changing You can now verify the flexibility of the design by implementing a JSON and YAML are very similar formats, so you can reuse most of the implementation of Let’s use the Python interactive interpreter to see the results:By implementing Factory Method using an Object Factory and providing a registration interface, you are able to support new formats without changing any of the existing application code. Complete this form and click the button below to gain instant access:'{"id": "1", "title": "Water of Love", "artist": "Dire Straits"}''Dire Straits''{"id": "1", "title": "Water of Love", "artist": "Dire Straits"}''Dire Straits''{"id": "1", "title": "Water of Love", "artist": "Dire Straits"}''Dire Straits'{"id": "1", "title": "Water of Love", "artist": "Dire Straits"}Dire Straits{artist: Dire Straits, id: '1', title: Water of Love}# Omitting other implementation classes shown aboveAccessing Pandora with PANDORA_CONSUMER_KEY and PANDORA_CONSUMER_SECRETAccessing Pandora with PANDORA_CONSUMER_KEY and PANDORA_CONSUMER_SECRET Then, you do the same for the XML option by introducing a new method The new version of the code is easier to read and understand, but it can still be improved with a basic implementation of Factory Method.The central idea in Factory Method is to provide a separate component with the responsibility to decide which concrete implementation should be used based on some specified parameter. You do this by adding a new method Once you make this change, you can verify that the behavior has not changed. Complex logical code uses The code above might not seem hard to read or understand, but wait till you see the final code in this section! Pandora might use a completely different authorization process. I’m sure you have probably come across other tutorials on how to create a factory in Python. Each service is initialized with a different set of parameters. I build, lead, and mentor software development teams, and for the past few years I've been focusing on cloud services and back-end applications using Python among other languages. But it’s not a good design for Python applications. The client will not have access to the logic of code and the output represents the creation of html page.The python code includes the logic of html tags, which specified value. It was designed for underpowered programming languages where classes and functions can’t be passed as parameters or stored as attributes. Factory Method is a creational design pattern used to create concrete implementations of a... Recognizing Opportunities to Use Factory Method. In those languages, the Factory Method serves as an awkward but necessary escape route. An Object Factory gives additional flexibility to the design when requirements change. This means a common initialization interface for each service implementation is not possible or recommended.The best approach is to define a new type of object that provides a general interface and is responsible for the creation of a concrete service. This service requires an authorization process where a client key and secret are provided for authorization. The concrete implementation of the interface is identified by some parameter.Let’s use the Python interactive shell to see how the code works:This example is short and simplified, but it still has a lot of complexity. These services can be external to the application or internal in order to support a local music collection. This is referred to as Let’s begin refactoring the code to achieve the desired structure that uses the Factory Method design pattern.The desired interface is an object or a function that takes a The first step is to refactor one of the logical paths into this interface. To put it in a simple manner, Factory Method Pattern is a design pattern which you let a function / method to handle the creation of an object. When a user calls a method such that we pass in a string and the return value as a new object is implemented through factory method.

This minimizes the risk of breaking existing features or introducing subtle bugs.Still, the current implementation is specifically targeted to the serialization problem above, and it is not reusable in other contexts.Factory Method can be used to solve a wide range of problems. The example above requires an interface that takes a Once you have a common interface, you provide separate implementations for each logical path. It also requires a client key and secret, but it returns a consumer key and secret that should be used for other communications. But what if I tell you, there is even an easier and more scalable way of getting the job done? How are you going to put your newfound skills to use?


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