Flask Run vs. Python3: Which is the Right Way to Run Your Flask Application?

How to Run a Flask Application: Flask Run vs. Python3

To run a Flask application, there are two primary methods:

Flask Run Command

$ flask --app sample --debug run

Advantages:

• Preferred way to start the development server in Flask.
• Allows for easy customization through command-line options.
• Automatically detects app instance or factory.

Usage:

• Use the --app option to specify the application.
• Use the --debug option to run in debug mode.

Python3 Command

$ python3.4 sample.py

Advantages:

• Simpler command that can execute any Python script.
• Useful if you have an app factory that requires instantiation.

Usage:

• Make sure the script calls app.run() to start the development server.

Key Differences

Feature	Flask Run Command	Python3 Command
Preferred method	Yes	No
Command-line options	Yes	No
Automatic app detection	Yes	No
Required setup	Environment variables or CLI options	App factory instantiation

Which Command to Use

In general, it's recommended to use the flask run command for development purposes. It provides a convenient interface, allows for easy debugging, and follows the recommended approach for Flask applications.

The Python3 command is primarily used if you have specific requirements, such as working with an app factory or making customizations that are not accessible through the flask run command.

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