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Python MongoDB - distinct()

Last Updated :04 Jul, 2025

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distinct() method in MongoDB is used toretrieve all unique values for a specified field from a collection. In Python, you can use this method with PyMongo to filter out duplicates and get a list of distinct values across documents. This is helpful when you want to find all unique fields without repeating values.

Syntax

collection.distinct(key, filter=None)

Parameters :

key (string): field name for which you want to find distinct values.
filter (optional, dict): a query to filter which documents to consider when finding distinct values.

Let's create a sample collection:

frompymongoimportMongoClientclient=MongoClient("mongodb://localhost:27017/")mydb=client['database']mycollection=mydb['myTable']# Insert sample documentsdocuments=[{"_id":1,"dept":"A","item":{"code":"012","color":"red"},"sizes":["S","L"]},{"_id":2,"dept":"A","item":{"code":"012","color":"blue"},"sizes":["M","S"]},{"_id":3,"dept":"B","item":{"code":"101","color":"blue"},"sizes":"L"},{"_id":4,"dept":"A","item":{"code":"679","color":"black"},"sizes":["M"]}]mycollection.insert_many(documents)# Print inserted documentsprint("Inserted Documents:\n")fordocinmycollection.find():print(doc)

Output

distinct-database — Snapshot of Terminal showing Collection created

Example:

In this Example,distinct() method is used to return unique values of different fields from the collection.

# 1. Return distinct values for the 'dept' fieldprint(mycollection.distinct('dept'))# 2. Return distinct values for the embedded field 'item.color'print(mycollection.distinct('item.color'))# 3. Return distinct values for the array field 'sizes'print(mycollection.distinct("sizes"))# 4. Return distinct 'item.code' where 'dept' is 'B'print(mycollection.distinct("item.code",{"dept":"B"}))

Output

distinct-output — Snapshot of Terminal showing Output of Distinct method

Related Article:
MongoDB Query
MongoDB Introduction
Connection of MongoDB and Python
insert_many() methods

Python MongoDB- rename()

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