Software engineering facts, information, and skills from July, 2019
Signal(providing_args=list)All signals are django.dispatch.Signal instances. The providing_args is a list of the names of arguments the signal will provide to listeners. This is purely documentational, however, as there is nothing that checks that the signal actually provides these arguments to its listeners.
Django Signals allows decoupled (independent) applications get notified when certain events occur elsewhere in the framework with the help of 'signal dispatcher'. The 'signal dispatcher' is Django's mechanism used to send and receive messages between different parts of an application which are instances of Signal, via the connect method.
Django uses request and response objects to pass state through the system. When a page is requested, Django creates an HttpRequest object that contains metadata about the request. Then Django loads the appropriate view, passing the HttpRequest as the first argument to the view function. Each view is responsible for returning an HttpResponse object.
There are various ways in python to merge Dictionaries. Few of them are shown below.
The term 'alias' is synonymous with a shortcut. Alias creation is a common pattern found in other popular utilities like `bash` shell. Aliases are used to create shorter commands that map to longer commands. Aliases enable more efficient workflows by requiring fewer keystrokes to execute a command.
<filesystem> (added in C++17) makes this straightforward.
Allows any and all code transformations that do not change the observable behavior of the program.
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