Find out how much memory is being used by an object in Python

In this article, we are going to see how to find out how much memory is being used by an object in Python. For this, we will use sys.getsizeof() function can be done to find the storage size of a particular object that occupies some space in the memory. This function returns the size of the object in bytes. It takes at most two arguments i.e Object itself.

Syntax: sys.getsizeof(object*)

Parameters: arg can be int, str, function, etc.

Returns: Size of the given object in bytes.

This function is versatile and can work with any data type and even a function. For this first sys module has to be imported and then the object in consideration is passed to the function. Given below are various implementations for different objects.

Example 1: Get the size of an integer. 

Python3

import sys

var = 1

print(sys.getsizeof(var))

Output:

28

Time Complexity: O(1)
Auxiliary Space: O(1)

Example 2: Get the size of an decimal.

Python3

import sys

var = 1.2

print(sys.getsizeof(var))

Output:

24

Time Complexity: O(1)
Auxiliary Space: O(1)

Example 3: Get the size of an String.

Python3

import sys

# string init
var1 = ""
var2 = "gfg"
var3 = "Welcome to gfg"

# get size of an object
print(sys.getsizeof(var1))
print(sys.getsizeof(var2))
print(sys.getsizeof(var3))

Output:

64
72
96

Time Complexity: O(n)
Auxiliary Space: O(1)

Example 4: Get the size of an List. 

Python3

# import module
import sys

# list init
var1 = []
var2 = [1]
var3 = [1, 2, 3, 4]

# check size of obj
print(sys.getsizeof(var1))
print(sys.getsizeof(var2))
print(sys.getsizeof(var3))

Output:

64
72
96

Time Complexity: O(n)
Auxiliary Space: O(1)

Example 5: Get the size of an Set. 

Python3

import sys

# set init
var1 = set([])
var2 = set([1, 2, 3, 4, 5])

# get size of object
print(sys.getsizeof(var1))
print(sys.getsizeof(var2))

Output:

224
736

Time Complexity: O(n)
Auxiliary Space: O(1)

Example 6: Get the size of an Dictionary. 

Python3

import sys

# dic
var1 = {'Apple':1}
var2 = {'Apple':1, 'ball': 2, 'cat':3,
        'dog': 4, 'egg': 5, 'frog': 6}

# get the size of object
print(sys.getsizeof(var1))
print(sys.getsizeof(var2))

Output:

240
368

Time Complexity: O(n)
Auxiliary Space: O(1)

Example 7: Get the size of an Function. 

Python3

import sys

def func():
    pass
var = func
print(sys.getsizeof(var))

Output:

136