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Requirements

Let's get our tutorial environment set up. Most of the set up work is in standard Python development practices (install Python and make an isolated virtual environment.)

Note

Pyramid encourages standard Python development practices with packaging tools, virtual environments, logging, and so on. There are many variations, implementations, and opinions across the Python community. For consistency, ease of documentation maintenance, and to minimize confusion, the Pyramid documentation has adopted specific conventions that are consistent with the :term:`Python Packaging Authority`.

This Quick Tutorial is based on:

  • Python 3.5. Pyramid fully supports Python 3.3+ and Python 2.7+. This tutorial uses Python 3.5 but runs fine under Python 2.7.
  • venv. We believe in virtual environments. For this tutorial, we use Python 3.5's built-in solution :term:`venv`. For Python 2.7, you can install :term:`virtualenv`.
  • pip. We use :term:`pip` for package management.
  • Workspaces, projects, and packages. Our home directory will contain a tutorial workspace with our Python virtual environment and Python projects (a directory with packaging information and Python packages of working code.)
  • Unix commands. Commands in this tutorial use UNIX syntax and paths. Windows users should adjust commands accordingly.

Note

Pyramid was one of the first web frameworks to fully support Python 3 in October 2011.

Note

Windows commands use the plain old MSDOS shell. For PowerShell command syntax, see its documentation.

Steps

  1. :ref:`install-python-3`
  2. :ref:`create-a-project-directory-structure`
  3. :ref:`set-an-environment-variable`
  4. :ref:`create-a-virtual-environment`
  5. :ref:`install-pyramid`

Install Python 3

See the detailed recommendation for your operating system described under :ref:`installing_chapter`.

Create a project directory structure

We will arrive at a directory structure of workspace -> project -> package, where our workspace is named quick_tutorial. The following tree diagram shows how this will be structured, and where our :term:`virtual environment` will reside as we proceed through the tutorial:

`── ~
    `── projects
        `── quick_tutorial
            │── env
            `── step_one
                │── intro
                │   │── __init__.py
                │   `── app.py
                `── setup.py

For Linux, the commands to do so are as follows:

# Mac and Linux
$ cd ~
$ mkdir -p projects/quick_tutorial
$ cd projects/quick_tutorial

For Windows:

# Windows
c:\> cd \
c:\> mkdir projects\quick_tutorial
c:\> cd projects\quick_tutorial

In the above figure, your user home directory is represented by ~. In your home directory, all of your projects are in the projects directory. This is a general convention not specific to Pyramid that many developers use. Windows users will do well to use c:\ as the location for projects in order to avoid spaces in any of the path names.

Next within projects is your workspace directory, here named quick_tutorial. A workspace is a common term used by integrated development environments (IDE), like PyCharm and PyDev, where virtual environments, specific project files, and repositories are stored.

Set an environment variable

This tutorial will refer frequently to the location of the :term:`virtual environment`. We set an environment variable to save typing later.

# Mac and Linux
$ export VENV=~/projects/quick_tutorial/env
# Windows
c:\> set VENV=c:\projects\quick_tutorial\env

Create a virtual environment

venv is a tool to create isolated Python 3 environments, each with its own Python binary and independent set of installed Python packages in its site directories. Let's create one, using the location we just specified in the environment variable.

# Mac and Linux
$ python3 -m venv $VENV
# Windows
c:\> c:\Python35\python3 -m venv %VENV%

Update packaging tools in the virtual environment

It's always a good idea to update to the very latest version of packaging tools because the installed Python bundles only the version that was available at the time of its release.

# Mac and Linux
$VENV/bin/pip install --upgrade pip setuptools
# Windows
c:\> %VENV%\Scripts\pip install --upgrade pip setuptools

Install Pyramid

We have our Python standard prerequisites out of the way. The Pyramid part is pretty easy.

# Mac and Linux
$ $VENV/bin/pip install "pyramid==|release|"

# Windows
c:\> %VENV%\Scripts\pip install "pyramid==|release|"

Our Python virtual environment now has the Pyramid software available.

You can optionally install some of the extra Python packages used in this tutorial.

# Mac and Linux
$ $VENV/bin/pip install webtest pytest pytest-cov deform sqlalchemy \
  pyramid_chameleon pyramid_debugtoolbar pyramid_jinja2 waitress \
  pyramid_tm zope.sqlalchemy
# Windows
c:\> %VENV%\Scripts\pip install webtest deform sqlalchemy pyramid_chameleon pyramid_debugtoolbar pyramid_jinja2 waitress pyramid_tm zope.sqlalchemy
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