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The Pyramid web application development framework, a Pylons project

Project description


Pyramid is a small, fast, down-to-earth, open source Python web application development framework. It makes real-world web application development and deployment more fun, more predictable, and more productive.

Pyramid is produced by the Pylons Project.

Support and Documentation

See the Pylons Project website to view documentation, report bugs, and obtain support.


Pyramid is offered under the BSD-derived Repoze Public License.


Pyramid is made available by Agendaless Consulting and a team of contributors.

1.4a1 (2012-09-16)

Bug Fixes

  • Forward port from 1.3 branch: When no authentication policy was configured, a call to would unconditionally return the empty list. This was incorrect, it should have unconditionally returned [Everyone], and now does.
  • Explicit url dispatch regexes can now contain colons.
  • On at least one 64-bit Ubuntu system under Python 3.2, using the view_config decorator caused a RuntimeError: dictionary changed size during iteration exception. It no longer does. See for more information.
  • In Mako Templates lookup, check if the uri is already adjusted and bring it back to an asset spec. Normally occurs with inherited templates or included components.
  • In Mako Templates lookup, check for absolute uri (using mako directories) when mixing up inheritance with asset specs.
  • HTTP Accept headers were not being normalized causing potentially conflicting view registrations to go unnoticed. Two views that only differ in the case (‘text/html’ vs. ‘text/HTML’) will now raise an error.
  • Forward-port from 1.3 branch: when registering multiple views with an accept predicate in a Pyramid application runing under Python 3, you might have received a TypeError: unorderable types: function() < function() exception.


  • Configurator.add_directive now accepts arbitrary callables like partials or objects implementing __call__ which dont have __name__ and __doc__ attributes. See and

  • Third-party custom view, route, and subscriber predicates can now be added for use by view authors via pyramid.config.Configurator.add_view_predicate, pyramid.config.Configurator.add_route_predicate and pyramid.config.Configurator.add_subscriber_predicate. So, for example, doing this:

    config.add_view_predicate('abc', my.package.ABCPredicate)

    Might allow a view author to do this in an application that configured that predicate:


    Similar features exist for add_route, and add_subscriber. See “Adding A Third Party View, Route, or Subscriber Predicate” in the Hooks chapter for more information.

    Note that changes made to support the above feature now means that only actions registered using the same “order” can conflict with one another. It used to be the case that actions registered at different orders could potentially conflict, but to my knowledge nothing ever depended on this behavior (it was a bit silly).

  • Custom objects can be made easily JSON-serializable in Pyramid by defining a __json__ method on the object’s class. This method should return values natively serializable by json.dumps (such as ints, lists, dictionaries, strings, and so forth).

  • The JSON renderer now allows for the definition of custom type adapters to convert unknown objects to JSON serializations.

  • As of this release, the request_method predicate, when used, will also imply that HEAD is implied when you use GET. For example, using @view_config(request_method='GET') is equivalent to using @view_config(request_method=('GET', 'HEAD')). Using @view_config(request_method=('GET', 'POST') is equivalent to using @view_config(request_method=('GET', 'HEAD', 'POST'). This is because HEAD is a variant of GET that omits the body, and WebOb has special support to return an empty body when a HEAD is used.

  • config.add_request_method has been introduced to support extending request objects with arbitrary callables. This method expands on the previous config.set_request_property by supporting methods as well as properties. This method now causes less code to be executed at request construction time than config.set_request_property in version 1.3.

  • Don’t add a ? to URLs generated by request.resource_url if the query argument is provided but empty.

  • Don’t add a ? to URLs generated by request.route_url if the _query argument is provided but empty.

  • The static view machinery now raises (rather than returns) HTTPNotFound and HTTPMovedPermanently exceptions, so these can be caught by the NotFound view (and other exception views).

  • The Mako renderer now supports a def name in an asset spec. When the def name is present in the asset spec, the system will render the template def within the template and will return the result. An example asset spec is package:path/to/template#defname.mako. This will render the def named defname inside the template.mako template instead of rendering the entire template. The old way of returning a tuple in the form ('defname', {}) from the view is supported for backward compatibility,

  • The Chameleon ZPT renderer now accepts a macro name in an asset spec. When the macro name is present in the asset spec, the system will render the macro listed as a define-macro and return the result instead of rendering the entire template. An example asset spec: package:path/to/ This will render the macro defined as macroname within the template instead of the entire templae.

  • When there is a predicate mismatch exception (seen when no view matches for a given request due to predicates not working), the exception now contains a textual description of the predicate which didn’t match.

  • An add_permission directive method was added to the Configurator. This directive registers a free-standing permission introspectable into the Pyramid introspection system. Frameworks built atop Pyramid can thus use the the permissions introspectable category data to build a comprehensive list of permissions supported by a running system. Before this method was added, permissions were already registered in this introspectable category as a side effect of naming them in an add_view call, this method just makes it possible to arrange for a permission to be put into the permissions introspectable category without naming it along with an associated view. Here’s an example of usage of add_permission:

    config = Configurator()
  • The UnencryptedCookieSessionFactoryConfig now accepts signed_serialize and signed_deserialize hooks which may be used to influence how the sessions are marshalled (by default this is done with HMAC+pickle).

  • pyramid.testing.DummyRequest now supports methods supplied by the pyramid.util.InstancePropertyMixin class such as set_property.

  • Request properties and methods added via config.set_request_property or config.add_request_method are now available to tweens.

  • Request properties and methods added via config.set_request_property or config.add_request_method are now available in the request object returned from pyramid.paster.bootstrap.

  • request.context of environment request during bootstrap is now the root object if a context isn’t already set on a provided request.

  • The pyramid.decorator.reify function is now an API, and was added to the API documentation.

  • Added the pyramid.testing.testConfig context manager, which can be used to generate a configurator in a test, e.g. with testing.testConfig(...):.

  • Users can now invoke a subrequest from within view code using a new request.invoke_subrequest API.


  • The pyramid.config.Configurator.set_request_property has been documentation-deprecated. The method remains usable but the more featureful pyramid.config.Configurator.add_request_method should be used in its place (it has all of the same capabilities but can also extend the request object with methods).

Backwards Incompatibilities

  • The Pyramid router no longer adds the values bfg.routes.route or bfg.routes.matchdict to the request’s WSGI environment dictionary. These values were docs-deprecated in repoze.bfg 1.0 (effectively seven minor releases ago). If your code depended on these values, use request.matched_route and request.matchdict instead.
  • It is no longer possible to pass an environ dictionary directly to pyramid.traversal.ResourceTreeTraverser.__call__ (aka ModelGraphTraverser.__call__). Instead, you must pass a request object. Passing an environment instead of a request has generated a deprecation warning since Pyramid 1.1.
  • Pyramid will no longer work properly if you use the webob.request.LegacyRequest as a request factory. Instances of the LegacyRequest class have a request.path_info which return a string. This Pyramid release assumes that request.path_info will unconditionally be Unicode.
  • The functions from pyramid.chameleon_zpt and pyramid.chameleon_text named get_renderer, get_template, render_template, and render_template_to_response have been removed. These have issued a deprecation warning upon import since Pyramid 1.0. Use pyramid.renderers.get_renderer(), pyramid.renderers.get_renderer().implementation(), pyramid.renderers.render() or pyramid.renderers.render_to_response respectively instead of these functions.
  • The pyramid.configuration module was removed. It had been deprecated since Pyramid 1.0 and printed a deprecation warning upon its use. Use pyramid.config instead.
  • The pyramid.paster.PyramidTemplate API was removed. It had been deprecated since Pyramid 1.1 and issued a warning on import. If your code depended on this, adjust your code to import pyramid.scaffolds.PyramidTemplate instead.
  • The pyramid.settings.get_settings() API was removed. It had been printing a deprecation warning since Pyramid 1.0. If your code depended on this API, use pyramid.threadlocal.get_current_registry().settings instead or use the settings attribute of the registry available from the request (request.registry.settings).
  • These APIs from the pyramid.testing module were removed. They have been printing deprecation warnings since Pyramid 1.0:
    • registerDummySecurityPolicy, use pyramid.config.Configurator.testing_securitypolicy instead.
    • registerResources (aka registerModels, use pyramid.config.Configurator.testing_resources instead.
    • registerEventListener, use pyramid.config.Configurator.testing_add_subscriber instead.
    • registerTemplateRenderer (aka registerDummyRenderer`), use pyramid.config.Configurator.testing_add_template instead.
    • registerView, use pyramid.config.Configurator.add_view instead.
    • registerUtility, use pyramid.config.Configurator.registry.registerUtility instead.
    • registerAdapter, use pyramid.config.Configurator.registry.registerAdapter instead.
    • registerSubscriber, use pyramid.config.Configurator.add_subscriber instead.
    • registerRoute, use pyramid.config.Configurator.add_route instead.
    • registerSettings, use pyramid.config.Configurator.add_settings instead.
  • In Pyramid 1.3 and previous, the __call__ method of a Response object was invoked before any finished callbacks were executed. As of this release, the __call__ method of a Response object is invoked after finished callbacks are executed. This is in support of the request.invoke_subrequest feature.


  • Added an “Upgrading Pyramid” chapter to the narrative documentation. It describes how to cope with deprecations and removals of Pyramid APIs and how to show Pyramid-generated deprecation warnings while running tests and while running a server.
  • Added a “Invoking a Subrequest” chapter to the documentation. It describes how to use the new request.invoke_subrequest API.


  • Pyramid now requires WebOb 1.2b3+ (the prior Pyramid release only relied on 1.2dev+). This is to ensure that we obtain a version of WebOb that returns request.path_info as text.

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