Python dict() Function is used to create a Python dictionary, a collection of key-value pairs.
Python3
dict(One = "1", Two = "2") |
Output:
{'One': '1', 'Two': '2'}
A dictionary is a mutable data structure i.e. the data in the dictionary can be modified. Dictionary is an indexed data structure i.e. the contents of a dictionary can be accessed by using indexes, here in the dictionary the key is used as an index.
Example 1: Creating dictionary using keyword arguments
We can pass keyword arguments as a parameter with the required values that will be keys and values of the dictionary.
Syntax:
dict(**kwarg)
Python3
# passing keyword arguments to dict() methodmyDict = dict(a=1, b=2, c=3, d=4)print(myDict) |
Output:
{'a': 1, 'b': 2, 'c': 3, 'd': 4}
Example 2: Creating deep-copy of the dictionary using dict()
Creating a new instance (deep copy) of dictionary using dict().
Syntax:
dict(mapping)
Python3
main_dict = {'a': 1, 'b': 2, 'c': 3}# deep copy using dictdict_deep = dict(main_dict)# shallow copy without dictdict_shallow = main_dict# changing value in shallow copy will change main_dictdict_shallow['a'] = 10print("After change in shallow copy, main_dict:", main_dict)# changing value in deep copy won't affect main_dictdict_deep['b'] = 20print("After change in deep copy, main_dict:", main_dict) |
Output:
After change in shallow copy, main_dict: {'a': 10, 'b': 2, 'c': 3}
After change in deep copy, main_dict: {'a': 10, 'b': 2, 'c': 3}
Example 3: Creating dictionary using iterables
The keys and values can be passed to dict() in form of iterables like lists or tuples to form a dictionary and keyword arguments can also be passed to dict().
Syntax:
dict(iterable, **kwarg)
Python3
# A list of key value pairs is passed and# a keyword argument is also passedmyDict = dict([('a', 1), ('b', 2), ('c', 3)], d=4)print(myDict) |
Output:
{'a': 1, 'b': 2, 'c': 3, 'd': 4}
