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.. _larger-applications:
Larger Applications
===================
For larger applications it's a good idea to use a package instead of a
module. That is quite simple. Imagine a small application looks like
this::
/yourapplication
/yourapplication.py
/static
/style.css
/templates
layout.html
index.html
login.html
...
Simple Packages
---------------
To convert that into a larger one, just create a new folder
`yourapplication` inside the existing one and move everything below it.
Then rename `yourapplication.py` to `__init__.py`. (Make sure to delete
all `.pyc` files first, otherwise things would most likely break)
You should then end up with something like that::
/yourapplication
/yourapplication
/__init__.py
/static
/style.css
/templates
layout.html
index.html
login.html
...
But how do you run your application now? The naive ``python
yourapplication/__init__.py`` will not work. Let's just say that Python
does not want modules in packages to be the startup file. But that is not
a big problem, just add a new file called `runserver.py` next to the inner
`yourapplication` folder with the following contents::
from yourapplication import app
app.run(debug=True)
What did we gain from this? Now we can restructure the application a bit
into multiple modules. The only thing you have to remember is the
following quick checklist:
1. the `Flask` application object creation has to be in the
`__init__.py` file. That way each module can import it safely and the
`__name__` variable will resolve to the correct package.
2. all the view functions (the ones with a :meth:`~flask.Flask.route`
decorator on top) have to be imported when in the `__init__.py` file.
Not the object itself, but the module it is in. Import the view module
**after the application object is created**.
Here's an example `__init__.py`::
from flask import Flask
app = Flask(__name__)
import yourapplication.views
And this is what `views.py` would look like::
from yourapplication import app
@app.route('/')
def index():
return 'Hello World!'
You should then end up with something like that::
/yourapplication
/runserver.py
/yourapplication
/__init__.py
/views.py
/static
/style.css
/templates
layout.html
index.html
login.html
...
.. admonition:: Circular Imports
Every Python programmer hates them, and yet we just added some:
circular imports (That's when two modules depend on each other. In this
case `views.py` depends on `__init__.py`). Be advised that this is a
bad idea in general but here it is actually fine. The reason for this is
that we are not actually using the views in `__init__.py` and just
ensuring the module is imported and we are doing that at the bottom of
the file.
There are still some problems with that approach but if you want to use
decorators there is no way around that. Check out the
:ref:`becomingbig` section for some inspiration how to deal with that.
.. _working-with-modules:
Working with Blueprints
-----------------------
If you have larger applications it's recommended to divide them into
smaller groups where each group is implemented with the help of a
blueprint. For a gentle introduction into this topic refer to the
:ref:`blueprints` chapter of the documentation.
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