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.. _wiki2_installation: |
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============ |
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Installation |
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============ |
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Before you begin |
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---------------- |
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This tutorial assumes that you have already followed the steps in |
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:ref:`installing_chapter`, except **do not create a virtual environment or |
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install Pyramid**. Thereby you will satisfy the following requirements. |
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* A Python interpreter is installed on your operating system. |
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* You've satisfied the :ref:`requirements-for-installing-packages`. |
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Install SQLite3 and its development packages |
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-------------------------------------------- |
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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 skip this step. |
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If you need to install the SQLite3 packages, then, for example, using the Debian system and ``apt-get``, the command would be the following: |
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.. code-block:: bash |
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$ sudo apt-get install libsqlite3-dev |
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Install cookiecutter |
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-------------------- |
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We will use a :term:`cookiecutter` to create a Python package project from a Python package project template. See `Cookiecutter Installation <https://cookiecutter.readthedocs.io/en/latest/installation.html>`_ for instructions. |
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Generate a Pyramid project from a cookiecutter |
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---------------------------------------------- |
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We will create a Pyramid project in your home directory for UNIX or at the root for Windows. It is assumed you know the path to where you installed ``cookiecutter``. Issue the following commands and override the defaults in the prompts as follows. |
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^^^^^^^ |
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.. code-block:: bash |
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$ cd ~ |
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$ cookiecutter gh:Pylons/pyramid-cookiecutter-alchemy --checkout 1.9-branch |
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^^^^^^^^^^ |
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.. code-block:: doscon |
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c:\> cd \ |
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c:\> cookiecutter gh:Pylons/pyramid-cookiecutter-alchemy --checkout 1.9-branch |
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On all operating systems |
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^^^^^^^^^^^^^^^^^^^^^^^^ |
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If prompted for the first item, accept the default ``yes`` by hitting return. |
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.. code-block:: text |
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You've cloned ~/.cookiecutters/pyramid-cookiecutter-alchemy before. |
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Is it okay to delete and re-clone it? [yes]: yes |
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project_name [Pyramid Scaffold]: myproj |
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repo_name [myproj]: tutorial |
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Change directory into your newly created project |
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------------------------------------------------ |
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^^^^^^^ |
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.. code-block:: bash |
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$ cd tutorial |
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^^^^^^^^^^ |
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.. code-block:: doscon |
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c:\> cd tutorial |
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Set and use a ``VENV`` environment variable |
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------------------------------------------- |
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We will set the ``VENV`` environment variable to the absolute path of the virtual environment, and use it going forward. |
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^^^^^^^ |
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.. code-block:: bash |
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$ export VENV=~/tutorial |
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^^^^^^^^^^ |
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.. code-block:: doscon |
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c:\tutorial> set VENV=c:\tutorial |
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Create a virtual environment |
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---------------------------- |
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^^^^^^^ |
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.. code-block:: bash |
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$ python3 -m venv $VENV |
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^^^^^^^^^^ |
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Each version of Python uses different paths, so you will need to adjust the path to the command for your Python version. Recent versions of the Python 3 installer for Windows now install a Python launcher. |
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Python 2.7: |
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.. code-block:: doscon |
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c:\tutorial> c:\Python27\Scripts\virtualenv %VENV% |
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Python 3.6: |
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.. code-block:: doscon |
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c:\tutorial> python -m venv %VENV% |
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Upgrade packaging tools in the virtual environment |
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-------------------------------------------------- |
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^^^^^^^ |
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.. code-block:: bash |
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$ $VENV/bin/pip install --upgrade pip setuptools |
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^^^^^^^^^^ |
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.. code-block:: doscon |
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c:\tutorial> %VENV%\Scripts\pip install --upgrade pip setuptools |
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.. _installing_project_in_dev_mode: |
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Installing the project in development mode |
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------------------------------------------ |
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In order to do development on the project easily, you must "register" the project as a development egg in your workspace. We will install testing requirements at the same time. We do so with the following command. |
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On UNIX |
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^^^^^^^ |
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.. code-block:: bash |
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$ $VENV/bin/pip install -e ".[testing]" |
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On Windows |
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^^^^^^^^^^ |
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.. code-block:: doscon |
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c:\tutorial> %VENV%\Scripts\pip install -e ".[testing]" |
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On all operating systems |
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^^^^^^^^^^^^^^^^^^^^^^^^ |
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The console will show ``pip`` checking for packages and installing missing packages. Success executing this command will show a line like the following: |
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.. code-block:: bash |
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Successfully installed Jinja2-2.8 Mako-1.0.6 MarkupSafe-0.23 \ |
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PasteDeploy-1.5.2 Pygments-2.1.3 SQLAlchemy-1.1.4 WebOb-1.6.3 \ |
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WebTest-2.0.24 beautifulsoup4-4.5.1 coverage-4.2 py-1.4.32 pyramid-1.7.3 \ |
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pyramid-debugtoolbar-3.0.5 pyramid-jinja2-2.7 pyramid-mako-1.0.2 \ |
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pyramid-tm-1.1.1 pytest-3.0.5 pytest-cov-2.4.0 repoze.lru-0.6 six-1.10.0 \ |
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transaction-2.0.3 translationstring-1.3 tutorial venusian-1.0 \ |
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waitress-1.0.1 zope.deprecation-4.2.0 zope.interface-4.3.3 \ |
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zope.sqlalchemy-0.7.7 |
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Testing requirements are defined in our project's ``setup.py`` file, in the ``tests_require`` and ``extras_require`` stanzas. |
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.. literalinclude:: src/installation/setup.py |
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:language: python |
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:lineno-match: |
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:lines: 24-28 |
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.. literalinclude:: src/installation/setup.py |
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:language: python |
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:lineno-match: |
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:lines: 48-50 |
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.. _sql_running_tests: |
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Run the tests |
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------------- |
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After you've installed the project in development mode as well as the testing |
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requirements, you may run the tests for the project. The following commands |
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provide options to py.test that specify the module for which its tests shall be |
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run, and to run py.test in quiet mode. |
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On UNIX |
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^^^^^^^ |
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.. code-block:: bash |
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$ $VENV/bin/py.test -q |
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On Windows |
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^^^^^^^^^^ |
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.. code-block:: doscon |
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c:\tutorial> %VENV%\Scripts\py.test -q |
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For a successful test run, you should see output that ends like this: |
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.. code-block:: bash |
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.. |
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2 passed in 0.44 seconds |
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Expose test coverage information |
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-------------------------------- |
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You can run the ``py.test`` command to see test coverage information. This |
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runs the tests in the same way that ``py.test`` does, but provides additional |
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:term:`coverage` information, exposing which lines of your project are covered by the |
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tests. |
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We've already installed the ``pytest-cov`` package into our virtual |
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environment, so we can run the tests with coverage. |
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On UNIX |
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^^^^^^^ |
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.. code-block:: bash |
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$ $VENV/bin/py.test --cov --cov-report=term-missing |
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On Windows |
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^^^^^^^^^^ |
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.. code-block:: doscon |
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c:\tutorial> %VENV%\Scripts\py.test --cov --cov-report=term-missing |
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If successful, you will see output something like this: |
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.. code-block:: bash |
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======================== test session starts ======================== |
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platform Python 3.6.0, pytest-3.0.5, py-1.4.31, pluggy-0.4.0 |
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rootdir: /Users/stevepiercy/tutorial, inifile: |
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plugins: cov-2.4.0 |
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collected 2 items |
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tutorial/tests.py .. |
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------------------ coverage: platform Python 3.6.0 ------------------ |
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Name Stmts Miss Cover Missing |
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---------------------------------------------------------------- |
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tutorial/__init__.py 8 6 25% 7-12 |
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tutorial/models/__init__.py 22 0 100% |
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tutorial/models/meta.py 5 0 100% |
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tutorial/models/mymodel.py 8 0 100% |
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tutorial/routes.py 3 2 33% 2-3 |
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tutorial/scripts/__init__.py 0 0 100% |
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tutorial/scripts/initializedb.py 26 16 38% 22-25, 29-45 |
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tutorial/views/__init__.py 0 0 100% |
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tutorial/views/default.py 12 0 100% |
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tutorial/views/notfound.py 4 2 50% 6-7 |
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---------------------------------------------------------------- |
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TOTAL 88 26 70% |
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===================== 2 passed in 0.57 seconds ====================== |
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Our package doesn't quite have 100% test coverage. |
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.. _test_and_coverage_cookiecutter_defaults_sql: |
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Test and coverage cookiecutter defaults |
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--------------------------------------- |
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Cookiecutters include configuration defaults for ``py.test`` and test coverage. |
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These configuration files are ``pytest.ini`` and ``.coveragerc``, located at |
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the root of your package. Without these defaults, we would need to specify the |
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path to the module on which we want to run tests and coverage. |
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^^^^^^^ |
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.. code-block:: bash |
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$ $VENV/bin/py.test --cov=tutorial tutorial/tests.py -q |
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^^^^^^^^^^ |
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.. code-block:: doscon |
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c:\tutorial> %VENV%\Scripts\py.test --cov=tutorial tutorial\tests.py -q |
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py.test follows :ref:`conventions for Python test discovery |
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<pytest:test discovery>`, and the configuration defaults from the cookiecutter |
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tell ``py.test`` where to find the module on which we want to run tests and |
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coverage. |
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.. seealso:: See py.test's documentation for :ref:`pytest:usage` or invoke |
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``py.test -h`` to see its full set of options. |
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.. _initialize_db_wiki2: |
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Initializing the database |
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------------------------- |
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We need to use the ``initialize_tutorial_db`` :term:`console script` to |
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initialize our database. |
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.. note:: |
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The ``initialize_tutorial_db`` command does not perform a migration, but |
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rather it simply creates missing tables and adds some dummy data. If you |
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already have a database, you should delete it before running |
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``initialize_tutorial_db`` again. |
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Type the following command, making sure you are still in the ``tutorial`` |
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directory (the directory with a ``development.ini`` in it): |
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On UNIX |
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^^^^^^^ |
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.. code-block:: bash |
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$ $VENV/bin/initialize_tutorial_db development.ini |
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^^^^^^^^^^ |
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.. code-block:: doscon |
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c:\tutorial> %VENV%\Scripts\initialize_tutorial_db development.ini |
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The output to your console should be something like this: |
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.. code-block:: bash |
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2016-12-18 21:30:08,675 INFO [sqlalchemy.engine.base.Engine:1235][MainThread] SELECT CAST('test plain returns' AS VARCHAR(60)) AS anon_1 |
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2016-12-18 21:30:08,675 INFO [sqlalchemy.engine.base.Engine:1236][MainThread] () |
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2016-12-18 21:30:08,676 INFO [sqlalchemy.engine.base.Engine:1235][MainThread] SELECT CAST('test unicode returns' AS VARCHAR(60)) AS anon_1 |
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2016-12-18 21:30:08,676 INFO [sqlalchemy.engine.base.Engine:1236][MainThread] () |
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2016-12-18 21:30:08,676 INFO [sqlalchemy.engine.base.Engine:1140][MainThread] PRAGMA table_info("models") |
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2016-12-18 21:30:08,676 INFO [sqlalchemy.engine.base.Engine:1143][MainThread] () |
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2016-12-18 21:30:08,677 INFO [sqlalchemy.engine.base.Engine:1140][MainThread] |
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CREATE TABLE models ( |
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id INTEGER NOT NULL, |
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name TEXT, |
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value INTEGER, |
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CONSTRAINT pk_models PRIMARY KEY (id) |
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) |
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2016-12-18 21:30:08,677 INFO [sqlalchemy.engine.base.Engine:1143][MainThread] () |
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2016-12-18 21:30:08,678 INFO [sqlalchemy.engine.base.Engine:719][MainThread] COMMIT |
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2016-12-18 21:30:08,679 INFO [sqlalchemy.engine.base.Engine:1140][MainThread] CREATE UNIQUE INDEX my_index ON models (name) |
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2016-12-18 21:30:08,679 INFO [sqlalchemy.engine.base.Engine:1143][MainThread] () |
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2016-12-18 21:30:08,679 INFO [sqlalchemy.engine.base.Engine:719][MainThread] COMMIT |
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2016-12-18 21:30:08,681 INFO [sqlalchemy.engine.base.Engine:679][MainThread] BEGIN (implicit) |
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2016-12-18 21:30:08,682 INFO [sqlalchemy.engine.base.Engine:1140][MainThread] INSERT INTO models (name, value) VALUES (?, ?) |
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2016-12-18 21:30:08,682 INFO [sqlalchemy.engine.base.Engine:1143][MainThread] ('one', 1) |
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2016-12-18 21:30:08,682 INFO [sqlalchemy.engine.base.Engine:719][MainThread] COMMIT |
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Success! You should now have a ``tutorial.sqlite`` file in your current |
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working directory. This is an SQLite database with a single table defined in it |
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(``models``). |
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.. _wiki2-start-the-application: |
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Start the application |
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--------------------- |
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Start the application. See :ref:`what_is_this_pserve_thing` for more |
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information on ``pserve``. |
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On UNIX |
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^^^^^^^ |
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.. code-block:: bash |
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$ $VENV/bin/pserve development.ini --reload |
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On Windows |
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^^^^^^^^^^ |
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.. code-block:: doscon |
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c:\tutorial> %VENV%\Scripts\pserve development.ini --reload |
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.. note:: |
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Your OS firewall, if any, may pop up a dialog asking for authorization |
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to allow python to accept incoming network connections. |
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If successful, you will see something like this on your console: |
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.. code-block:: text |
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Starting subprocess with file monitor |
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Starting server in PID 44078. |
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Serving on http://localhost:6543 |
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Serving on http://localhost:6543 |
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This means the server is ready to accept requests. |
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Visit the application in a browser |
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---------------------------------- |
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In a browser, visit http://localhost:6543/. You will see the generated |
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application's default page. |
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One thing you'll notice is the "debug toolbar" icon on right hand side of the |
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page. You can read more about the purpose of the icon at |
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:ref:`debug_toolbar`. It allows you to get information about your |
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application while you develop. |
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Decisions the ``alchemy`` cookiecutter has made for you |
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------------------------------------------------------- |
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Creating a project using the ``alchemy`` cookiecutter makes the following |
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assumptions: |
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- You are willing to use SQLite for persistent storage, although almost any SQL database could be used with SQLAlchemy. |
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- You are willing to use :term:`SQLAlchemy` for a database access tool. |
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- You are willing to use :term:`URL dispatch` to map URLs to code. |
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- You want to use zope.sqlalchemy_, pyramid_tm_, and the transaction_ packages |
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to scope sessions to requests. |
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- You want to use pyramid_jinja2_ to render your templates. Different |
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templating engines can be used, but we had to choose one to make this |
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tutorial. See :ref:`available_template_system_bindings` for some options. |
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.. note:: |
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:app:`Pyramid` supports any persistent storage mechanism (e.g., object |
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database or filesystem files). It also supports an additional mechanism to |
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map URLs to code (:term:`traversal`). However, for the purposes of this |
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tutorial, we'll only be using :term:`URL dispatch` and :term:`SQLAlchemy`. |
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.. _pyramid_jinja2: |
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http://docs.pylonsproject.org/projects/pyramid-jinja2/en/latest/ |
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.. _pyramid_tm: |
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http://docs.pylonsproject.org/projects/pyramid-tm/en/latest/ |
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.. _zope.sqlalchemy: |
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https://pypi.python.org/pypi/zope.sqlalchemy |
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.. _transaction: |
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http://zodb.readthedocs.org/en/latest/transactions.html |