A Dictionary in Python works similarly to the Dictionary in the real world. The keys of a Dictionary must be unique and of immutable data types such as Strings, Integers, and tuples, but the key values can be repeated and be of any type.
What is Python in Nested Dictionary?
Nesting Dictionary means putting a dictionary inside another dictionary. Nesting is of great use as the kind of information we can model in programs is expanded greatly.
nested_dict = {'dict1': {'key_A': 'value_A'},
'dict2': {'key_B': 'value_B'}}
Example
Python3
Dict = {1: 'Geeks', 2: 'For', 3: {'A': 'Welcome', 'B': 'To', 'C': 'Geeks'}}
|
Illustration using Image
Creating a Nested Dictionary
In Python, a Nested dictionary can be created by placing the comma-separated dictionaries enclosed within braces.
Python3
Dict = { 'Dict1': { },
'Dict2': { }}
print("Nested dictionary 1-")
print(Dict)
Dict = { 'Dict1': {'name': 'Ali', 'age': '19'},
'Dict2': {'name': 'Bob', 'age': '25'}}
print("\nNested dictionary 2-")
print(Dict)
Dict = { 'Dict1': {1: 'G', 2: 'F', 3: 'G'},
'Dict2': {'Name': 'Geeks', 1: [1, 2]} }
print("\nNested dictionary 3-")
print(Dict)
|
Output:
Nested dictionary 1-
{'Dict1': {}, 'Dict2': {}}
Nested dictionary 2-
{'Dict1': {'name': 'Ali', 'age': '19'}, 'Dict2': {'name': 'Bob', 'age': '25'}}
Nested dictionary 3-
{'Dict1': {1: 'G', 2: 'F', 3: 'G'}, 'Dict2': {1: [1, 2], 'Name': 'Geeks'}}
Adding Elements to a Nested Dictionary
The addition of elements to a nested Dictionary can be done in multiple ways. One way to add a dictionary in the Nested dictionary is to add values one be one, Nested_dict[dict][key] = ‘value’. Another way is to add the whole dictionary in one go, Nested_dict[dict] = { ‘key’: ‘value’}.
Python3
Dict = { }
print("Initial nested dictionary:-")
print(Dict)
Dict['Dict1'] = {}
Dict['Dict1']['name'] = 'Bob'
Dict['Dict1']['age'] = 21
print("\nAfter adding dictionary Dict1")
print(Dict)
Dict['Dict2'] = {'name': 'Cara', 'age': 25}
print("\nAfter adding dictionary Dict1")
print(Dict)
|
Output:
Initial nested dictionary:-
{}
After adding dictionary Dict1
{'Dict1': {'age': 21, 'name': 'Bob'}}
After adding dictionary Dict1
{'Dict1': {'age': 21, 'name': 'Bob'}, 'Dict2': {'age': 25, 'name': 'Cara'}}
Access Elements of a Nested Dictionary
In order to access the value of any key in the nested dictionary, use indexing [] syntax.
Python3
Dict = { 'Dict1': {'name': 'Ali', 'age': '19'},
'Dict2': {'name': 'Bob', 'age': '25'}}
print(Dict['Dict1']['name'])
print(Dict['Dict2']['age'])
|
Output:
Ali
25
Deleting Dictionaries from a Nested Dictionary
Deletion of dictionaries from a nested dictionary can be done either by using the Python del keyword or by using pop() function.
Python3
Dict = {'Dict1': {'name': 'Ali', 'age': 19},
'Dict2': {'name': 'Bob', 'age': 21}}
print("Initial nested dictionary:-")
print(Dict)
print("\nDeleting Dict2:-")
del Dict['Dict2']
print(Dict)
print("\nDeleting Dict1:-")
Dict.pop('Dict1')
print (Dict)
|
Output:
Initial nested dictionary:-
{'Dict2': {'name': 'Bob', 'age': 21}, 'Dict1': {'name': 'Ali', 'age': 19}}
Deleting Dict2:-
{'Dict1': {'name': 'Ali', 'age': 19}}
Deleting Dict1:-
{}
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