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108 lines
3.8 KiB
108 lines
3.8 KiB
.. _tutorial-packaging: |
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Step 3: Installing flaskr as a Package |
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====================================== |
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Flask is now shipped with built-in support for `Click`_. Click provides |
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Flask with enhanced and extensible command line utilities. Later in this |
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tutorial you will see exactly how to extend the ``flask`` command line |
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interface (CLI). |
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A useful pattern to manage a Flask application is to install your app |
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following the `Python Packaging Guide`_. Presently this involves |
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creating two new files; :file:`setup.py` and :file:`MANIFEST.in` in the |
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projects root directory. You also need to add an :file:`__init__.py` |
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file to make the :file:`flaskr/flaskr` directory a package. After these |
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changes, your code structure should be:: |
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/flaskr |
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/flaskr |
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__init__.py |
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/static |
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/templates |
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flaskr.py |
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schema.sql |
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setup.py |
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MANIFEST.in |
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Create the ``setup.py`` file for ``flaskr`` with the following content:: |
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from setuptools import setup |
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setup( |
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name='flaskr', |
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packages=['flaskr'], |
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include_package_data=True, |
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install_requires=[ |
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'flask', |
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], |
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) |
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When using setuptools, it is also necessary to specify any special files |
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that should be included in your package (in the :file:`MANIFEST.in`). |
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In this case, the static and templates directories need to be included, |
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as well as the schema. |
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Create the :file:`MANIFEST.in` and add the following lines:: |
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graft flaskr/templates |
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graft flaskr/static |
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include flaskr/schema.sql |
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Next, to simplify locating the application, create the file, |
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:file:`flaskr/__init__.py` containing only the following import statement:: |
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from .flaskr import app |
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This import statement brings the application instance into the top-level |
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of the application package. When it is time to run the application, the |
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Flask development server needs the location of the app instance. This |
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import statement simplifies the location process. Without the above |
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import statement, the export statement a few steps below would need to be |
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``export FLASK_APP=flaskr.flaskr``. |
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At this point you should be able to install the application. As usual, it |
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is recommended to install your Flask application within a `virtualenv`_. |
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With that said, from the ``flaskr/`` directory, go ahead and install the |
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application with:: |
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pip install --editable . |
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The above installation command assumes that it is run within the projects |
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root directory, ``flaskr/``. The ``editable`` flag allows editing |
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source code without having to reinstall the Flask app each time you make |
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changes. The flaskr app is now installed in your virtualenv (see output |
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of ``pip freeze``). |
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With that out of the way, you should be able to start up the application. |
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Do this on Mac or Linux with the following commands in ``flaskr/``:: |
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export FLASK_APP=flaskr |
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export FLASK_ENV=development |
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flask run |
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(In case you are on Windows you need to use ``set`` instead of ``export``). |
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Exporting ``FLASK_ENV=development`` turns on all development features |
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such as enabling the interactive debugger. |
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*Never leave debug mode activated in a production system*, because it will |
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allow users to execute code on the server! |
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You will see a message telling you that server has started along with |
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the address at which you can access it in a browser. |
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When you head over to the server in your browser, you will get a 404 error |
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because we don't have any views yet. That will be addressed a little later, |
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but first, you should get the database working. |
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.. admonition:: Externally Visible Server |
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Want your server to be publicly available? Check out the |
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:ref:`externally visible server <public-server>` section for more |
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information. |
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Continue with :ref:`tutorial-dbcon`. |
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.. _Click: http://click.pocoo.org |
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.. _Python Packaging Guide: https://packaging.python.org |
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.. _virtualenv: https://virtualenv.pypa.io
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