Python dict() function is “used to create a dictionary, a collection of key-value pairs.”
Syntax
dict(**kwarg)
dict([mapping, **kwarg])
dict([iterable, **kwarg])
Parameters
The keyword argument is preceded by an identifier (e.g., name=). Hence, the keyword argument of a form kwarg=value is passed to a dict() constructor to create dictionaries.
- kwarg: It’s the keyword argument and is optional in the function. The **kwarg lets you take an arbitrary number of keyword arguments.
- mapping: It is also optional (Another dictionary).
- iterable: It is also optional. An iterable is a collection of key-value pairs where keys must be unique and immutable.
Return value
- If no argument is passed, it creates an empty dictionary.
- If a positional argument is given, a dictionary is created with the same key-value pairs. Otherwise, pass an iterable object.
- If keyword arguments are given, the keyword arguments and their values are added to the dictionary created from the positional argument.
Example 1: How to Use dict() Function
Creating a dictionary from keyword arguments.
main_dict = dict(a=1, b=2, c=3)
print("Dictionary from keyword arguments:", main_dict)
Output
Dictionary from keyword arguments: {'a': 1, 'b': 2, 'c': 3}
Example 2: Creating a dictionary from an iterable
Creating a dictionary from an iterable containing key-value pairs:
main_list = [('a', 1), ('b', 2), ('c', 3)]
main_dict = dict(main_list)
print("Dictionary from iterable of key-value pairs:", main_dict)
Output
Dictionary from iterable of key-value pairs: {'a': 1, 'b': 2, 'c': 3}
Example 3: Create a dictionary using mapping
Creating a dictionary from another dictionary or mapping.
original_dict = {'a': 1, 'b': 2, 'c': 3}
main_dict = dict(original_dict)
print("Dictionary from another dictionary:", main_dict)
Output
Dictionary from another dictionary: {'a': 1, 'b': 2, 'c': 3}That’s it.
Ankit Lathiya is a Master of Computer Application by education and Android and Laravel Developer by profession and one of the authors of this blog. He is also expert in JavaScript and Python development.
