Different forms of dict() constructors are:
class dict(**kwarg) class dict(mapping, **kwarg) class dict(iterable, **kwarg)
Note: **kwarg let you take an arbitrary number of keyword arguments.
A keyword argument is an argument preceded by an identifier (eg. name=). Hence, the keyword argument of the form kwarg=value is passed to dict() constructor to create dictionaries.
dict() doesn't return any value (returns None).
Example 1: Create Dictionary Using keyword arguments only
Output
numbers = {'y': 0, 'x': 5}
<class 'dict'>
empty = {}
<class 'dict'>
Example 2: Create Dictionary Using Iterable
Output
numbers1 = {'y': -5, 'x': 5}
numbers2 = {'z': 8, 'y': -5, 'x': 5}
numbers3 = {'z': 3, 'y': 2, 'x': 1}
Example 3: Create Dictionary Using Mapping
Output
numbers1 = {'x': 4, 'y': 5}
numbers2 = {'x': 4, 'y': 5}
numbers3 = {'x': 4, 'z': 8, 'y': 5}
Recommended Reading: Python dictionary and how to work with them.