Some module

Adding Routes and Views

add_route(name, pattern=None, view=None, view_for=None, permission=None, factory=None, for_=None, header=None, xhr=False, accept=None, path_info=None, request_method=None, request_param=None, traverse=None, custom_predicates=(), view_permission=None, renderer=None, view_renderer=None, view_context=None, view_attr=None, use_global_views=False, path=None, pregenerator=None, static=False)

Add a route configuration to the current configuration state, as well as possibly a view configuration to be used to specify a view callable that will be invoked when this route matches. The arguments to this method are divided into predicate, non-predicate, and view-related types. Route predicate arguments narrow the circumstances in which a route will be match a request; non-predicate arguments are informational.

Chains

The processor chain is a list of processors. Each processors receives three positional arguments:

dict classes

A regular class whose attributes are stored in the object.__dict__ attribute of every single instance. This is quite wasteful especially for objects with very few data attributes and the space consumption can become significant when creating large numbers of instances.

This is the type of class you get by default both with and without attrs (except with the next APIs attr.define, attr.mutable, and attr.frozen).