execution policy
A hook in Pyramid which can control the entire request lifecycle.
A web framework.
retryable error

An exception indicating that a request failed due to a transient error which may succeed if tried again. Examples might include lock contention or a flaky network connection to a third party service.

A retryable error is usually an exception that inherits from pyramid_retry.RetryableException but may also be any other exception that implements the pyramid_retry.IRetryableError interface.

view predicate
A predicate in Pyramid which can help determine which view should be executed for a given request. Many views may be registered for a similar url, query strings etc and all predicates must pass in order for the view to be considered.