Convert a List of Dictionaries into a Set of Dictionaries

Python’s versatility allows developers to manipulate data in various ways. When working with a list of dictionaries, there might be scenarios where you want to convert it into a set of dictionaries to eliminate duplicates or for other reasons. In this article, we’ll explore three different methods to achieve this goal with code examples.

Convert A List Of Dictionaries Into A Set Of Dictionaries

Below, are the methods of Convert A List Of Dictionaries Into A Set Of Dictionaries in Python.

• Using For Loop
• Using list comprehension
• Using map() Function
• Using a Custom Function the

Convert A List Of Dictionaries Into A Set Of Dictionaries Using For Loop

In this example, the below code uses a loop to convert a list of dictionaries into a set of tuples, each containing the key-value pairs of a dictionary. The resulting set represents unique dictionaries from the original list based on their items.

Python3

# Using a loop
list_of_dicts = [{'name': 'a', 'age': 23}, {'name': 'b', 'age': 21}, {'name': 'c', 'age': 20}]
set_of_dicts = set()

for d in list_of_dicts:
    set_of_dicts.add(tuple(d.items()))

print(set_of_dicts)

Output

{(('name', 'a'), ('age', 23)), (('name', 'c'), ('age', 20)), (('name', 'b'), ('age', 21))}

Convert A List Of Dictionaries Into A Set Of Dictionaries Using List Comprehension

In this example, below code employs list comprehension to efficiently convert a list of dictionaries into a set of tuples, where each tuple encapsulates the key-value pairs of a dictionary. The set represents unique dictionaries from the original list based on their items.

Python3

# Using list comprehension
list_of_dicts = [{'name': 'a', 'age': 23}, {'name': 'b', 'age': 21}, {'name': 'c', 'age': 20}]
set_of_dicts = {tuple(d.items()) for d in list_of_dicts}

print(set_of_dicts)

Output

{(('name', 'a'), ('age', 23)), (('name', 'c'), ('age', 20)), (('name', 'b'), ('age', 21))}

Convert A List Of Dictionaries Into A Set Of Dictionaries Using map() Function

In this example, below code utilizes the `map` function along with a lambda expression to transform a list of dictionaries into a set of tuples, where each tuple contains the key-value pairs of a dictionary. The resulting set represents unique dictionaries from the original list based on their items.

Python3

# Using map function
list_of_dicts = [{'name': 'a', 'age': 23}, {'name': 'b', 'age': 21}, {'name': 'c', 'age': 20}]
set_of_dicts = set(map(lambda x: tuple(x.items()), list_of_dicts))

print(set_of_dicts)

Output

{(('name', 'a'), ('age', 23)), (('name', 'c'), ('age', 20)), (('name', 'b'), ('age', 21))}

Convert A List Of Dictionaries Into A Set Of Dictionaries Using a Custom Function

In this example, below code defines a custom function `dict_to_frozenset` that converts a dictionary into a frozenset of its key-value pairs. The set comprehension is then used to create a set of frozensets, representing unique dictionaries from the original list based on their items.

Python3

#  Using custom function
def dict_to_frozenset(d):
    return frozenset(d.items())

list_of_dicts = [{'name': 'a', 'age': 23}, {'name': 'b', 'age': 21}, {'name': 'c', 'age': 20}]
set_of_dicts = {dict_to_frozenset(d) for d in list_of_dicts}

print(set_of_dicts)

Output

{frozenset({('age', 21), ('name', 'b')}), frozenset({('age', 23), ('name', 'a')}), frozenset({('age', 20), ('name', 'c')})}

Conclusion

In conclusion , Converting a list of dictionaries into a set of dictionaries in Python can be achieved through various methods. Whether you choose to use core Python functionalities, custom functions, or external libraries like Pandas, each method offers a unique approach to accomplishing the task. Consider the specific requirements of your project and choose the method that best suits your needs.