How to Sort a Dictionary by Keys in Python

How to Sort a Dictionary by Keys in Python ?

Answer

To sort a dictionary by keys in Python, you can use the `sorted()` function and a dictionary comprehension. This allows you to create a new dictionary with the key-value pairs sorted by key.

✐ Examples

1 Sorting a Dictionary by Keys Using `sorted()`

We can sort a dictionary by keys in Python using the `sorted()` function and a dictionary comprehension. This example demonstrates how to declare and initialize a dictionary, use the `sorted()` function to sort the dictionary by keys, and print the sorted dictionary.

For example,

We start by declaring and initializing a dictionary named my_dict with integer keys and string values.
We use the `sorted()` function to get the keys in sorted order.
We use a dictionary comprehension to create a new dictionary with the sorted keys.
We print the sorted dictionary.

Python Program

my_dict = {
    3: 'Three',
    1: 'One',
    2: 'Two'
}

# Sort the dictionary by keys using sorted()
sorted_dict = {k: my_dict[k] for k in sorted(my_dict)}

# Print the sorted dictionary
print('Sorted dictionary:')
for key, value in sorted_dict.items():
    print(f'Key: {key}, Value: {value}')

Output

Sorted dictionary:
Key: 1, Value: One
Key: 2, Value: Two
Key: 3, Value: Three

2 Sorting a Dictionary by Keys in Descending Order

We can sort a dictionary by keys in descending order in Python using the `sorted()` function and a dictionary comprehension with the `reverse=True` parameter. This example demonstrates how to declare and initialize a dictionary, use the `sorted()` function to sort the dictionary by keys in descending order, and print the sorted dictionary.

For example,

We start by declaring and initializing a dictionary named my_dict with integer keys and string values.
We use the `sorted()` function to get the keys in sorted order with the `reverse=True` parameter.
We use a dictionary comprehension to create a new dictionary with the sorted keys in descending order.
We print the sorted dictionary.

Python Program

my_dict = {
    3: 'Three',
    1: 'One',
    2: 'Two'
}

# Sort the dictionary by keys in descending order using sorted()
sorted_dict = {k: my_dict[k] for k in sorted(my_dict, reverse=True)}

# Print the sorted dictionary
print('Sorted dictionary:')
for key, value in sorted_dict.items():
    print(f'Key: {key}, Value: {value}')

Output

Sorted dictionary:
Key: 3, Value: Three
Key: 2, Value: Two
Key: 1, Value: One

Summary

In this tutorial, we learned How to Sort a Dictionary by Keys in Python language with well detailed examples.

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