What is difference between len() and getsizeof()

In this blog, we would discuss What is difference between len() and getsizeof(). Python has a built-in function called len() that returns the number of items in a list, tuple, set, dictionary, or string. You can use the len() function to find out how many items are in a list, tuple, set, dictionary, or string.  len() is a built-in function, which means you don’t need to import anything to use it.

 

 

Just call len() with the object you want to get the length of. Python’s sys.getsizeof() function is a quick way to check the size of an object in memory. This function is handy when you want to optimize your code for performance. The sys.getsizeof() function returns the size of an object in bytes. The object can be any type of object, including strings, lists, tuples, dictionaries, etc.

 

 

 

 

What is difference between len() and getsizeof() in python

 

Now we shall look into the difference between len() and getsizeof(). Well, for strings, lists, and tuples, len() returns the number of items in the object. So “hello” has 5 characters, [1, 2, 3] has 3 items, and (1, 2, 3) has 3 items.

 

 

For dictionaries, len() returns the number of key-value pairs. So {“a”: 1, “b”: 2} has 2 key-value pairs. One thing to keep in mind is that the len() function will only return the length of the object, not the size in bytes.

 

 

For example, if you have a list of strings, the len() function will return the number of strings in the list, not the number of characters in the strings.

 

 

The len() function is a built-in function in Python that returns the length of an object. Here’s a quick example of how to use the len() function on a string:

 

my_string = "Hello, world!"
len(my_string)

 

 

As you can see, the len() function returns the length of the string, which is 13 characters. You can also use the len() function on lists, tuples, and dictionaries: 

 

my_list = [1, 2, 3, 4, 5]
len(my_list)

 

Output

 

 

my_dict = {"one": 1, "two": 2, "three": 3}
len(my_dict)

 

Output

 

 

Python’s sys.getsizeof() function is a handy way to find out how much memory an object is using. This can be useful when you’re trying to optimize your code or troubleshoot memory leaks.

 

 

Here’s a quick example:

 

import sys

sys.getsizeof("Hello world!")

 

Output

 

 

As you can see, the string “Hello world!” takes up 61 bytes in memory. The size of an object can vary depending on the type of object and the platform you’re using. For example, on my 64-bit machine, an empty list takes up 40 bytes, whereas, on a 32-bit machine, it takes up 24 bytes. If you’re working with large objects, such as lists with a lot of data, you should be aware of the impact on memory usage. In general, you want to avoid creating too many large objects, or you’ll quickly run out of memory.

 

 

The sys.getsizeof() function returns the size of an object in bytes. The object can be anything from a simple data type like an integer to a complex data type like a list. Here’s a quick example of how to use sys.getsizeof():

 

import sys
sys.getsizeof(5)

 

Output

 

sys.getsizeof([1,2,3,4,5])

 

Output

 

 

As you can see, sys.getsizeof() is pretty straightforward to use. Just pass in the object you want to get the size of and it will return the size in bytes. The size returned includes the memory used by the object itself as well as any memory used by the object’s references. If you want to get the true memory usage of an object, you can use the Resource module. The Resource module provides a more accurate way to measure an object’s memory usage.

 

 

 

Also, read about how to use for Loop Increment by 2 in Python.