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Build a Scalable Flask Web Project From Scratch

By default, Flask expects your templates to be in a templates/ directory. Therefore, you don’t need to include templates/ in the path of the templates. Then, you define two routes, one as the home view and the other as the about view. Each of them returns a string to indicate on which page you are on.

  • Flask uses the Jinja template engine to dynamically build HTML pages using familiar Python concepts such as variables, loops, lists, and so on.
  • Now the database stuff is out of way, let’s create the way for users to interact with the application itself.
  • Let’s imagine you’re visiting apple.com and want to go to the Mac section at apple.com/mac/.
  • In this step, you’ll make a small Flask web application inside a Python file, in which you’ll write HTML code to display on the browser.

The templates in your project provide the logic and structure for the front end of your project. With the help of Cascading Style Sheets (CSS), you can style the content. By providing default content inside the content block in line 13, you either display the No messages hint or show the content of the child template.

from flask import Flask, render_template, request, url_for, flash, redirect

Flask is more flexible compared to other Python web frameworks like Django, but the onus is on you to get things working correctly as there are not many rules or “Flask way” of doing things. Yes, Flask and Django both are Free Open Source, Python-based web frameworks that are used for Advanced Python Web Dev Using Flask Lessons building web applications. If you are using Git, it is a good idea to ignore the newly created env directory in your .gitignore file to avoid tracking files not related to the project. We have a endpoints variable that will contain links to the different parts of the management page.

Loved by developers for its clean and simple syntax and powerful data analysis toolkit, Python is one of the world’s top 5 most popular programming languages. You use the python command line interface with the option -c to execute Python code. Next you import the flask package with import flask; then print the Flask version, which is provided via the flask.__version__ variable.

Make Your Project Look Nice

To demonstrate how to handle errors, you will create a route that greets a user from a list of usernames. Normally, users don’t interact with a web application by manually editing the URL. This means that installing Flask also installed several other packages.

  • It will become hidden in your post, but will still be visible via the comment’s permalink.
  • You’ve also learned how to use dynamic routes to allow users to interact with your web application via the URL, and how to use the debugger to troubleshoot errors.
  • Wtforms allows us to create forms in an object oriented manner where each form is a class.
  • We then put a route decorator @login_required on the route, this decorator will throw a 403 error if the user isn’t logged in but will also allow the user to view the route if they are logged in.
  • Once you create the app instance, you use it to handle incoming web requests and send responses to the user.

I assume that you have installed Python 3 and have it working. If not, you can Google and find some good tutorials for doing so with your concerned operating system. In the preceding code block, you first import the Flask object from the flask package. You then use it to create your Flask application instance with the name app. You pass the special variable __name__ that holds the name of the current Python module. It’s used to tell the instance where it’s located—you need this because Flask sets up some paths behind the scenes.

The global request object to access incoming request data that will be submitted via an HTML form.

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  • The overall layout and alignment of the web elements give the website a clean and modern look.
  • Let’s set up the /change-club-details route which just renders and accepts info from the EditClubForm form.
  • Python’s extensive libraries and frameworks, such as Django and Flask, streamline the web development process, while its scalability ensures your web app can grow with your user base.
  • With the commands shown above, you create and activate a virtual environment named venv by using Python’s built-in venv module.

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