How to Create Unique Identifiers in Python?

How to Create Unique Identifiers in Python?


The Importance of Unique Identifiers

In the world of data management, knowing how to create unique identifiers in Python for each record is crucial for efficiently organizing and connecting different tables. When working with databases, it is essential to employ a special kind of identifier that can provide each row of a table with a unique identity. Unlike other fields such as name or address, which may be duplicated, IDs offer a reliable way to identify and distinguish between different records.
For example, in a customer database, using fields like email or cell phone as identifiers may lead to confusion and duplicate entries. A unique identifier or even several unique identifiers is the only way to identify and locate specific records or to merge datasets.

What is UUID in Python?

The UUID is a Python package that generates  an alphanumeric string variable type that uniquely identifies an object, entity, or resource in both space and time within a table.
The identifiers are generated using a combination of time, machine information, and some random data. As a result, the chances of generating two identical UUIDs in Python are extremely low, making it highly unlikely that two different entities will have the same UUID. In fact, the UUID module in Python follows the RFC 4122 definition for generating distinctive IDs.
Moreover, UUID does not require any third-party libraries for installation. It offers various functions to generate UUIDs of different versions. For example:


The uuid1() function creates an ID by utilizing the computer’s MAC address and the current time. This version of UUID is based on the host ID, sequence number, and the current time. Here’s an example of using uuid1() to generate a UUID:

import uuid

uuid1 = uuid.uuid1()



The uuid4() function generates a random ID using a pseudo-random number generator. This type of identifier is the most commonly used and is considered the safest option. Here’s an example:

import uuid

uuid4 = uuid.uuid4()


Unique identifiers are essential for working with databases. They provide a reliable and efficient way to identify and distinguish between different records. The UUID library in Python offers various functions to generate easily different versions of UUIDs.

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