============ Installation ============ Before you begin ================ This tutorial assumes that you have already followed the steps in :ref:`installing_chapter`, except **do not create a virtualenv or install Pyramid**. Thereby you will satisfy the following requirements. * Python interpreter is installed on your operating system * :term:`setuptools` or :term:`distribute` is installed * :term:`virtualenv` is installed Create directory to contain the project --------------------------------------- We need a workspace for our project files. On UNIX ^^^^^^^ .. code-block:: text $ mkdir ~/pyramidtut On Windows ^^^^^^^^^^ .. code-block:: text c:\> mkdir pyramidtut Create and use a virtual Python environment ------------------------------------------- Next let's create a `virtualenv` workspace for our project. We will use the `VENV` environment variable instead of the absolute path of the virtual environment. On UNIX ^^^^^^^ .. code-block:: text $ export VENV=~/pyramidtut $ virtualenv $VENV New python executable in /home/foo/env/bin/python Installing setuptools.............done. On Windows ^^^^^^^^^^ .. code-block:: text c:\> set VENV=c:\pyramidtut Versions of Python use different paths, so you will need to adjust the path to the command for your Python version. Python 2.7: .. code-block:: text c:\> c:\Python27\Scripts\virtualenv %VENV% Python 3.3: .. code-block:: text c:\> c:\Python33\Scripts\virtualenv %VENV% Install Pyramid into the virtual Python environment --------------------------------------------------- On UNIX ^^^^^^^ .. code-block:: text $ $VENV/bin/easy_install pyramid On Windows ^^^^^^^^^^ .. code-block:: text c:\> %VENV%\Scripts\easy_install pyramid Install SQLite3 and its development packages -------------------------------------------- If you used a package manager to install your Python or if you compiled your Python from source, then you must install SQLite3 and its development packages. If you downloaded your Python as an installer from https://www.python.org, then you already have it installed and can proceed to the next section :ref:`sql_making_a_project`. If you need to install the SQLite3 packages, then, for example, using the Debian system and ``apt-get``, the command would be the following: .. code-block:: text $ sudo apt-get install libsqlite3-dev Change directory to your virtual Python environment --------------------------------------------------- Change directory to the ``pyramidtut`` directory. On UNIX ^^^^^^^ .. code-block:: text $ cd pyramidtut On Windows ^^^^^^^^^^ .. code-block:: text c:\> cd pyramidtut .. _sql_making_a_project: Making a project ================ Your next step is to create a project. For this tutorial we will use the :term:`scaffold` named ``alchemy`` which generates an application that uses :term:`SQLAlchemy` and :term:`URL dispatch`. :app:`Pyramid` supplies a variety of scaffolds to generate sample projects. We will use `pcreate` — a script that comes with Pyramid to quickly and easily generate scaffolds, usually with a single command — to create the scaffold for our project. By passing `alchemy` into the `pcreate` command, the script creates the files needed to use SQLAlchemy. By passing in our application name `tutorial`, the script inserts that application name into all the required files. For example, `pcreate` creates the ``initialize_tutorial_db`` in the ``pyramidtut/bin`` directory. The below instructions assume your current working directory is "pyramidtut". On UNIX ------- .. code-block:: text $ $VENV/bin/pcreate -s alchemy tutorial On Windows ---------- .. code-block:: text c:\pyramidtut> %VENV%\Scripts\pcreate -s alchemy tutorial .. note:: If you are using Windows, the ``alchemy`` scaffold may not deal gracefully with installation into a location that contains spaces in the path. If you experience startup problems, try putting both the virtualenv and the project into directories that do not contain spaces in their paths. .. _installing_project_in_dev_mode: Installing the project in development mode ========================================== In order to do development on the project easily, you must "register" the project as a development egg in your workspace using the ``setup.py develop`` command. In order to do so, cd to the `tutorial` directory you created in :ref:`sql_making_a_project`, and run the ``setup.py develop`` command using the virtualenv Python interpreter. On UNIX ------- .. code-block:: text $ cd tutorial $ $VENV/bin/python setup.py develop On Windows ---------- .. code-block:: text c:\pyramidtut> cd tutorial c:\pyramidtut\tutorial> %VENV%\Scripts\python setup.py develop The console will show `setup.py` checking for packages and installing missing packages. Success executing this command will show a line like the following:: Finished processing dependencies for tutorial==0.0 .. _sql_running_tests: Run the tests ============= After you've installed the project in development mode, you may run the tests for the project. On UNIX ------- .. code-block:: text $ $VENV/bin/python setup.py test -q On Windows ---------- .. code-block:: text c:\pyramidtut\tutorial> %VENV%\Scripts\python setup.py test -q For a successful test run, you should see output that ends like this:: . ---------------------------------------------------------------------- Ran 1 test in 0.094s OK Expose test coverage information ================================ You can run the ``nosetests`` command to see test coverage information. This runs the tests in the same way that ``setup.py test`` does but provides additional "coverage" information, exposing which lines of your project are "covered" (or not covered) by the tests. To get this functionality working, we'll need to install the ``nose`` and ``coverage`` packages into our ``virtualenv``: On UNIX ------- .. code-block:: text $ $VENV/bin/easy_install nose coverage On Windows ---------- .. code-block:: text c:\pyramidtut\tutorial> %VENV%\Scripts\easy_install nose coverage Once ``nose`` and ``coverage`` are installed, we can actually run the coverage tests. On UNIX ------- .. code-block:: text $ $VENV/bin/nosetests --cover-package=tutorial --cover-erase --with-coverage On Windows ---------- .. code-block:: text c:\pyramidtut\tutorial> %VENV%\Scripts\nosetests --cover-package=tutorial \ --cover-erase --with-coverage If successful, you will see output something like this:: . Name Stmts Miss Cover Missing --------------------------------------------------- tutorial.py 13 9 31% 13-21 tutorial/models.py 12 0 100% tutorial/scripts.py 0 0 100% tutorial/views.py 11 0 100% --------------------------------------------------- TOTAL 36 9 75% ---------------------------------------------------------------------- Ran 2 tests in 0.643s OK Looks like our package doesn't quite have 100% test coverage. .. _initialize_db_wiki2: Initializing the database ========================= We need to use the ``initialize_tutorial_db`` :term:`console script` to initialize our database. .. note:: The ``initialize_tutorial_db`` command is not performing a migration but rather simply creating missing tables and adding some dummy data. If you already have a database, you should delete it before running ``initialize_tutorial_db`` again. Type the following command, making sure you are still in the ``tutorial`` directory (the directory with a ``development.ini`` in it): On UNIX ------- .. code-block:: text $ $VENV/bin/initialize_tutorial_db development.ini On Windows ---------- .. code-block:: text c:\pyramidtut\tutorial> %VENV%\Scripts\initialize_tutorial_db development.ini The output to your console should be something like this:: 2015-05-23 16:49:49,609 INFO [sqlalchemy.engine.base.Engine:1192][MainThread] SELECT CAST('test plain returns' AS VARCHAR(60)) AS anon_1 2015-05-23 16:49:49,609 INFO [sqlalchemy.engine.base.Engine:1193][MainThread] () 2015-05-23 16:49:49,610 INFO [sqlalchemy.engine.base.Engine:1192][MainThread] SELECT CAST('test unicode returns' AS VARCHAR(60)) AS anon_1 2015-05-23 16:49:49,610 INFO [sqlalchemy.engine.base.Engine:1193][MainThread] () 2015-05-23 16:49:49,610 INFO [sqlalchemy.engine.base.Engine:1097][MainThread] PRAGMA table_info("models") 2015-05-23 16:49:49,610 INFO [sqlalchemy.engine.base.Engine:1100][MainThread] () 2015-05-23 16:49:49,612 INFO [sqlalchemy.engine.base.Engine:1097][MainThread] CREATE TABLE models ( id INTEGER NOT NULL, name TEXT, value INTEGER, PRIMARY KEY (id) ) 2015-05-23 16:49:49,612 INFO [sqlalchemy.engine.base.Engine:1100][MainThread] () 2015-05-23 16:49:49,613 INFO [sqlalchemy.engine.base.Engine:686][MainThread] COMMIT 2015-05-23 16:49:49,613 INFO [sqlalchemy.engine.base.Engine:1097][MainThread] CREATE UNIQUE INDEX my_index ON models (name) 2015-05-23 16:49:49,613 INFO [sqlalchemy.engine.base.Engine:1100][MainThread] () 2015-05-23 16:49:49,614 INFO [sqlalchemy.engine.base.Engine:686][MainThread] COMMIT 2015-05-23 16:49:49,616 INFO [sqlalchemy.engine.base.Engine:646][MainThread] BEGIN (implicit) 2015-05-23 16:49:49,617 INFO [sqlalchemy.engine.base.Engine:1097][MainThread] INSERT INTO models (name, value) VALUES (?, ?) 2015-05-23 16:49:49,617 INFO [sqlalchemy.engine.base.Engine:1100][MainThread] ('one', 1) 2015-05-23 16:49:49,618 INFO [sqlalchemy.engine.base.Engine:686][MainThread] COMMIT Success! You should now have a ``tutorial.sqlite`` file in your current working directory. This will be a SQLite database with a single table defined in it (``models``). .. _wiki2-start-the-application: Start the application ===================== Start the application. On UNIX ------- .. code-block:: text $ $VENV/bin/pserve development.ini --reload On Windows ---------- .. code-block:: text c:\pyramidtut\tutorial> %VENV%\Scripts\pserve development.ini --reload .. note:: Your OS firewall, if any, may pop up a dialog asking for authorization to allow python to accept incoming network connections. If successful, you will see something like this on your console:: Starting subprocess with file monitor Starting server in PID 8966. Starting HTTP server on http://0.0.0.0:6543 This means the server is ready to accept requests. Visit the application in a browser ================================== In a browser, visit http://localhost:6543/. You will see the generated application's default page. One thing you'll notice is the "debug toolbar" icon on right hand side of the page. You can read more about the purpose of the icon at :ref:`debug_toolbar`. It allows you to get information about your application while you develop. Decisions the ``alchemy`` scaffold has made for you =================================================== Creating a project using the ``alchemy`` scaffold makes the following assumptions: - You are willing to use :term:`SQLAlchemy` as a database access tool. - You are willing to use :term:`URL dispatch` to map URLs to code. - You want to use zope.sqlalchemy_, pyramid_tm_ and the transaction_ package to scope sessions to requests. - You want to use pyramid_jinja2_ to render your templates. Different templating engines can be used but we had to choose one to make the tutorial. See :ref:`available_template_system_bindings` for some options. .. note:: :app:`Pyramid` supports any persistent storage mechanism (e.g., object database or filesystem files). It also supports an additional mechanism to map URLs to code (:term:`traversal`). However, for the purposes of this tutorial, we'll only be using URL dispatch and SQLAlchemy. .. _pyramid_jinja2: http://docs.pylonsproject.org/projects/pyramid-jinja2/en/latest/ .. _pyramid_tm: http://docs.pylonsproject.org/projects/pyramid-tm/en/latest/ .. _zope.sqlalchemy: https://pypi.python.org/pypi/zope.sqlalchemy .. _transaction: http://zodb.readthedocs.org/en/latest/transactions.html