Django Signals

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.

HttpRequest methods

HttpRequest represents an incoming HTTP request, including all HTTP headers and user-submitted data

HttpRequest attributes

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.

Merging two Dictionaries- Python

There are various ways in python to merge Dictionaries. Few of them are shown below.

Git aliases

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. 

Get a file's size with C++17

std:: experimental:: filesystem:: file_size

<filesystem> (added in C++17) makes this straightforward.

The as-if rule

Allows any and all code transformations that do not change the observable behavior of the program.