For many years the famous “Hello, World” example Flask application was 7 lines long. Below you can see a snapshot of the Flask website as it looked on June 12th, 2017:
Doing it Right¶. Let’s install a real version of Python. Before installing Python, you’ll need to install GCC. GCC can be obtained by downloading Xcode, the smaller Command Line Tools (must have an Apple account) or the even smaller OSX-GCC-Installer package. The official home of the Python Programming Language. While Javascript is not essential for this website, your interaction with the content will be limited. Download Python Runner for macOS 10.9 or later and enjoy it on your Mac. Write and run Python code instantly! Python Runner is a handy tool for learning Python or running Python script for daily tasks. We recommend that you download and install Python 3, and use Python 3 exclusively when running programs associated with this booksite. Perform these steps to download and install Python, IDLE, Tkinter, NumPy, and PyGame: Browse to the Python for Mac download page. In the resulting page click on the Download Python 3.6.5 button. The application remains running even with no open windows. The right semantics is 'Quit' an application, which is a distinct action, available from the application's menu in the menu-bar (the menu named after the application itself) its key-abbreviation is Command-Q – Motti Shneor Jun 22 '16 at 4:10.
This example application then was shortened to just 5 lines. Here is the same page on June 17th, 2017:
As you can see, the core of the application has not changed, but the method by which the application server is started has indeed changed, and in a very significant way. While previously a simple
app.run() call inside the application script was used, now there is a flask run command, plus a FLASK_APP environment variable.
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While the design of the Flask website has changed considerably in the years that followed, as I’m writing this article in 2020 the
flask run method continues to be the most visible in the official documentation for the framework.
Today you can still find a large number of applications and code tutorials that use the
app.run() method. One reason for this is that there is a lot of older but otherwise still relevant content out there for Flask. But also, a lot of people still see app.run() as more convenient and easier to use.
Run Python Script Mac Terminal
How to build mac app starting terminal with parameters. In this article we are going to explore the pros and cons of each of these methods. Ready? Let’s dive in!
Should I use app.run() or flask run?
We'll begin with the million dollar question. If you are starting a new Flask application today, should you use
app.run() or flask run ?
Unfortunately there isn’t a simple answer.
The most important thing you need to know is that both these methods start a development web server, which is a server that you will use locally on your own system while you develop your application. If you are trying to figure out how to start your application on a production server, then the answer is indeed simple: use neither. For a production deployment use a production-ready web server such as gunicorn or uWSGI.
In a development environment, both methods are fully supported, so you can use the one you like best. But of course, you probably want some help in deciding, so let’s look at both methods in detail.
Run Python In Mac TerminalUsing flask run
The
flask run method is the newest solution and is recommended by the Flask project.
The
flask command is added to your virtual environment when you install the Flask package. It comes out of the box with three commands:
The Flask framework includes a command-line interface module that allows third-party Flask extensions or even your own application to install custom commands to complement the base three, making this a very powerful and extensible system for managing all aspects of your Flask application.
The tricky part about getting the
flask run command to work is that somehow this command needs to figure out where your Flask application instance is located, so that it can import it and use it.
How
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