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Identity Field Pattern with Example in Python

In Python, an “Identity Field” generally refers to a field or attribute of an object that uniquely identifies that object. This is similar to the concept of an identity column in a database table, where each row has a unique identifier.

Here’s a simple example in Python to illustrate the concept of an identity field:

class Person:
def __init__(self, name, age):
self.id = id(self) # Using the id() function as the identity field
self.name = name
self.age = age

# Creating instances of the Person class
person1 = Person(“Sam”, 25)
person2 = Person(“Rose”, 30)

# Displaying the objects and their identity fields
print(f”Person 1: ID={person1.id}, Name={person1.name}, Age={person1.age}”)
print(f”Person 2: ID={person2.id}, Name={person2.name}, Age={person2.age}”)

In this example, the Person class has an id attribute, which is set to the unique identifier of each instance using the id() function. The id() function returns the identity of an object, which is a unique integer for the lifetime of the object.

Note that using the id() function as an identity field might not be suitable for all scenarios, especially in more complex applications or when objects are serialized and deserialized. In real-world scenarios, you might use other strategies like UUIDs or database-generated IDs for identity fields. The example here is simplified to demonstrate the basic concept.

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