What Is the Size of Object Data Type?


Scott Campbell

The size of the object data type is an important consideration when working with programming languages like Python. In this tutorial, we will explore the size of the object data type and its implications for memory usage.

What is the object data type?

In Python, everything is an object. This means that every variable you create in Python is an instance of a class, which has its own methods and attributes. The object data type is the most general data type in Python and can be used to represent any value.

Size of the object data type

The size of an object in Python depends on various factors, such as the number of attributes and methods it has, as well as any additional memory overhead required by the interpreter. However, there are some general guidelines that can help us estimate the size of an object.

  • Empty objects: An empty object in Python typically occupies around 56 bytes of memory.
  • Objects with attributes: The size of an object increases with each attribute it has. Each attribute generally adds around 8 bytes to the overall size of the object.
  • Methods: Methods do not contribute significantly to the size of an object since they are shared among all instances of a class.

It’s important to note that these estimates may vary depending on the Python version and implementation you are using. Additionally, objects that inherit from other classes may have additional memory overhead due to inheritance.


Let’s take a look at a simple example to illustrate how we can estimate the size of an object in Python:

class Person:
def __init__(self, name):
self.name = name

person1 = Person(“John”)
person2 = Person(“Jane”)

import sys


In this example, we define a `Person` class with a single attribute `name`. We create two instances of the `Person` class and use the `sys.getsizeof()` function to get the size of each object in bytes.


The size of the object data type in Python can vary depending on various factors such as attributes, methods, and inheritance. By understanding these factors, we can estimate the memory usage of our programs and optimize them if necessary.

In this tutorial, we explored the size of the object data type and discussed some guidelines for estimating its size. We also provided an example to demonstrate how to use the `sys.getsizeof()` function to get the size of an object in Python.

Remember: It’s always a good practice to be mindful of memory usage when working with large datasets or resource-intensive applications.

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