This approach shifts the focus from merely implementing features to ensuring that the implemented features work correctly and meet the desired requirements. By adhering to TDD, developers can achieve a higher level of code quality and maintainability. As we are planning to eventually release our API in the cloud, we are going to create a Dockerfile to describe what is needed to run the application on a Docker container. We need to install Docker on our development machine to test and run dockerized instances of our project. Defining a Docker recipe (Dockerfile) will help us run the API in different environments. That is, in the future, we will also install Docker and run our program on environments like production and staging.
As a Flask developer, it is essential to create high-quality, maintainable, and scalable web applications that meet users’ needs and withstand the test of time. One effective way to achieve these goals is by adopting Test Driven Development (TDD), which emphasises writing tests before implementing the functionality. In this section, you’ll spin up a development server and display “Hello, World!” in the browser with just a few lines of code. Then, you’ll expand your project structure to prepare a scalable Flask web application. Flask’s wide array of extension libraries comes at the cost of having a more
complicated project setup.
Applications of Flask
If we get “Python 2” instead, we can try issuing python3 –version. If this command produces the correct output, we must replace all commands throughout flask developer the article to use python3 instead of just python. Stop the development server in your other terminal that runs the hello application with CTRL+C.
For example, Flask doesn’t provide a page template engine, but installing Flask includes the Jinja templating engine by default. For convenience, we typically speak of these defaults as part of Flask. Flask provides a run command to run the application with a
development server. In development mode, this server provides an
interactive debugger and will reload when code is changed.
Save the app.py file and open a new post.html template file for editing:
To check that this script is working correctly, we run ./bootstrap.sh to get similar results as when executing the “Hello, world!” application. First and foremost, we will need to install some dependencies on our development machine. We will need to install Python 3, Pip (Python Package Index), and Flask. Being lightweight, easy to adopt, well-documented, and popular, Flask is a good option for developing RESTful APIs. FastAPI is growing at high speed, with 48k stars on Github, 370 contributors, and more than 3.9k forks. This elegant framework built for high-performance and fast-to-code APIs is not one to miss.
- For the endpoint used to retrieve incomes, we defined an instance of IncomeSchema to produce a JSON representation of incomes.
- With this you can access the word passed through the URL and respond with a capitalized version of it using the capitalize() method in Python.
- Test coverage analysis acts as a guide for testing by highlighting areas where your code lacks test coverage.
- You build your API, you shipped to production, and developers are eager to consume it, but how would they know what endpoints are available and how to use them?
- With the commands shown above, you create and activate a virtual environment named venv by using Python’s built-in venv module.
This ensures that the URLs formed are unique and based on precedents laid down by Apache. As in the previous example, our application returns a “Hello, world!” message. We will start improving it in a second, but first, let’s create an executable file called bootstrap.sh in the root directory of our application. Pipenv is a dependency manager that isolates projects in private environments, allowing packages to be installed per project. If you’re familiar with NPM or Ruby’s bundler, it’s similar in spirit to those tools.
HTML heading, you use the format() Python method, for more on this method, see How To Use String Formatters in Python 3
Flask has high prospects in the job market, and it is not getting outdated anytime soon. People have been developing web applications for a long time now, and the market needs enthusiasts like you to build great things. For more ideas on monetizing your web development skills, check out our article on How to Make Money as a Web Developer.
When creating a web application, a Flask developer must select an architecture or development framework to separate the application’s internal work from that of the users. Modern developers have the option of using either the Model View Controller architecture or the Model View template architecture. In this step, you’ll use dynamic routes to allow users to interact with the application.
Blueprints are modules that contain related views that you can conveniently import in __init__.py. For example, you’ll have a blueprint that stores the main pages of your project. You can stop the development server by pressing Ctrl+C in your terminal. With the commands shown above, you create and activate a virtual environment named venv by using Python’s built-in venv module. The parenthesized (venv) in front of the prompt indicates that you’ve successfully activated the virtual environment.