Pyramid is a python framework which is general
purpose, open source and used for web application framework. It allows
developer to create web applications with ease.
Pyramid is backed
by the enterprise knowledge Management System KARL (a George Soros project).
to Install and configure pyramid.
Pyramid is similar as Flask framework which
takes very little effort to install and run. In fact, you’ll recognize that
some of the patterns are similar to Flask once you start building your own application.
Following are the steps to create pyramid
framework environment −
First, create a project
directory. Here, we have created a directory named pyramidProject (you
can choose any name you want).
Next, create a virtual environment
where you will install all the project specific dependencies. Here, we created
a virtual environment folder named pyramidEnv where Pyramid is
Then, go to the
directory, pyramidEnv and install the pyramid with pip
Once everything is done as mentioned above, your
directory structure will be as shown below −
And you can check the version installed in the
system as shown below –
are the Core Concepts?
The Pyramid framework is based on below core
Zope (extensibility, traversal, declarative
security) − Pyramid is loosely based on Zope in terms of extensibility, the
concept of traversal and the declarative security.
Pylons (URL dispatch, non-opinionated view of
persistence, templating, etc.) − Another area from where pyramid draws its
concept is the pylons project. Pylons have that concept of routes, that calls
the URL dispatch inside the pyramid framework and they also have the
non-opinionated view of persistence layer or templating.
Django (View, level of documentation) − Pyramid
also gets hint from Django. The way we take our view, routed our URL and the
level of documentation is very Django way.
The following are the features of the Pyramid
One of the fastest known
Python web frameworks.
Pyramid supports small
and large projects (why rewrite when you outgrow your small framework).
Pyramid supports single
file webapps like microframeworks.
Pyramid has built-in
Pyramid supports events
similar to Plone/Zope.
Transaction Management (if already have noticed that we have used Zope before).
Configuration is the settings that influence the
operation of an application. There are two ways by which we can configure a
pyramid application: imperative configuration and declarative configuration.
Pyramid configuration supports −
or even the overriding of the decorator-based configs
detection (including more local vs. less local determination)
Extensibility (included from multiple apps)
and Authorization Policies
Introspection of Configuration (view current state of routes to generate nav)
do we generate URL?
In pyramid, we can generate URLs for routes,
resources and static assets. It is easy and flexible to work with URL
generation APIs. By generating URLs through pyramid’s various APIs, users can
change the configuration arbitrarily without much worry of breaking a link with
any of your web pages.
So, in short, URL in pyramid −
It supports URL
generation to allow changes to app that won’t break links.
It generates URLs to
static resources that live either inside or outside the application.
It supports Routes and
is View in pyramid framework?
One of the primary jobs of pyramid framework is
to find and invoke a view callable when a request reaches your application.
View callable are bits of code which do something interesting in response to a
request made in your application.
When you map your views onto your URL dispatch
or python code, there can be any kind of call. Views can be a function
declaration or an instance, it can be used as a view in the pyramid.
Some important points about Views are as follows
Views are generated from
Renderer based views can
simply return dictionaries (not required to return a webby style object).
Support multiple views
per route (GET vs. POST vs. HTTP Header check, etc.).
View response adapters
(when you want to specify how view returns values should be handled vs.
is Extensibility in pyramid framework?
Pyramid is designed with extensibility in mind. So,
if a pyramid developer is keeping in mind certain constraints while building an
application, a third party should be able to change the application’s behavior
without needing to modify its source code. The behavior of a pyramid
application that obeys certain constraints can be overridden or extended
without any modification. It is designed for flexible deployments to multiple
environments (No Singletons). Pyramid has “Tweens” middleware support (WSGI
middle ware, but runs in the context of Pyramid itself).
a Hello, Pyramid Program
The simplest program we can think after
installing pyramid framework to check if everything is working fine, is to run
a simple “Hello, World” or “Hello, Pyramid” program.
Below is my pyramid “Hello, Pyramid” program on
8000 port number −
Above simple example is easy to run. Save this
as app.py (In this, we have given the name pyramid_helloW.py).
Running the simplest program: −
Next, open http://localhost:8000/ in
a browser, and you will see the Hello, Pyramid! Message as follows −
The following is the explanation for above code
At the head of the file, we have import
statements. The first line imports make_server function, which can create a
simple web server when it is passed to an application. The second and third
line import the configuration and Response function from pyramid. These
functions are used to configure details and set parameters for the application
and respond to requests, respectively.
Now we have a function definition called hello_world.
Implement view code that generates the response. A function that fulfils the
requirement of a view is responsible for rendering the text that will be passed
back to the requesting entity. In the above case, the function, when called,
uses the Response function we imported earlier. This passes back a value that
should be given to the client.
if __name__ == ‘__main__’: Python is saying,
“Start here when running from the command line”, rather than when this module
In line no. 9, we create a variable called
config out of the object created by the configurator function that we imported
at the top of the program. Line 10 and 11 call the add_route and add_view
method of this object. This method is used to define a view that can be used by
the application. As we can see, we pass the hello_world function we defined
earlier. This is where that function is actually incorporated as a view.
In this, we actually create the WSGI application
by calling the make_wsgi_app method of the config object. This uses the
object’s attributes, such as the view we added, to create an application. This
application is then passed to the make_server function we imported in order to
create an object that can launch a web server to serve our application. The
last line launches this server.
Our hello world application is
one of the simplest and easiest possible pyramid applications, configured
“imperatively”. It is imperative because the full power of Python is available
to us as we perform configuration tasks.
Pyramid is an open source python web framework
with a large and active community. This large community contributes towards
making the python web framework popular and relevant. Pyramid web framework
simplify and accelerate web application development by providing a set of
robust features and tools.
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