pyramid_jinja2 must be included into the Configurator in order to use pyramid_jinja2.renderer_factory otherwise you may see the exception:
ValueError: As of pyramid_jinja2 2.3, the use of the "pyramid_jinja2.renderer_factory" requires that pyramid_jinja2 be configured via config.include("pyramid_jinja2") or the equivalent "pyramid.includes" setting.
The fix is to include pyramid_jinja2:
Claim Python 3.4 support [mmerickel]
#75: Fix the missing piece of relative template loading by allowing a template to inherit from a template relative to itself, instead of forcing the parent to be on the search path. [mmerickel]
#73: Added a new config.add_jinja2_renderer API that can create and override multiple Jinja2 renderers, each loaded using potentially different settings and extensions.
The other APIs are now keyed on the renderer extension, as each extension may have different settings. Thus config.add_jinja2_search_path, config.add_jinja2_extension, and config.get_jinja2_environment accept a name argument, which defaults to .jinja2.
This deprecates the old pyramid_jinja2.renderer_factory mechanism for adding renderers with alternate extensions.
Configuration of the renderers has been updated to follow Pyramid’s standard mechanisms for conflict detection. This means that if two modules both try to add a renderer for the .jinja2 extension, they may raise a conflict or the modifications made by the invocation closest to the Configurator in the call-stack will win. This behavior can be affected by calling config.commit at appropriate times to force a configuration to take effect immediately. As such, configuration is deferred until commit-time, meaning that it is now possible config.get_jinja2_environment will return None because the changes have not yet been committed. [mmerickel]
Add pyramid.reload_templates to set jinja2.auto_reload instead of using reload_templates. Deprecate the latter. [Domen Kozar]
Clear bytecode cache on atexit [Domen Kozar]
Add support for more Jinja2 options. Note support for jinja2.autoescape is limited to boolean only.