How to Create Nested Dictionary in Python

In this tutorial, we are going to see how to create nested dictionary in Python. A dictionary in Python works in a similar way to a dictionary in the real world. The keys of a dictionary must be unique and have an immutable data type, such as string, integer, etc… but the values can be repeated many times and be of any type.

In Python, a dictionary is an unordered collection. For example:

dictionary = {'key1' : 'value1', 'key2': 'value2'}

 
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What is a nested dictionary in Python?

In Python, a nested dictionary is a dictionary within another dictionary.

nested_dictionary = {
 'dict_1': {
     'key_1': 'value_1'
 },
 'dict_2': {
     'key_2': 'value_2'
 }
}

 

How to Create Nested Dictionary in Python

In the code below, “students” is a dictionary. Nested dictionaries 1 and 2 are assigned to the “students” dictionary. Here, the two nested dictionaries have the keys “name” and “age” with different values. Next, we display the “students” dictionary.

students = {
    1: {
        'name': 'Alex',
        'age': '15'
    },
    2: {
        'name': 'Bob',
        'age': '29'
    }
}
print(students)

Output:

{1: {'name': 'Alex', 'age': '15'}, 2: {'name': 'Bob', 'age': '29'}}

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Access the elements of a nested dictionary

students = {
    1: {
        'name': 'Alex',
        'age': '15'
    },
    2: {
        'name': 'Bob',
        'age': '29'
    }
}
print(students[1]['name'])
print(students[1]['age'])

Output:

Alex
15

 

Add an element to a nested dictionary

students = {
    1: {
        'name': 'Alex',
        'age': '15'
    },
    2: {
        'name': 'Bob',
        'age': '29'
    }
}
students[3] = {}

students[3]['name'] = 'Jean'
students[3]['age'] = '22'

print(students[3])

Output:

{'name': 'Jean', 'age': '22'}

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