# Python: Counting the Number of Elements in a List (4 Examples)

This quick article shows you how to count the number of elements in a list in Python.

## Using the len() function

The built-in `len()` function takes a list as an argument and returns an integer value that represents the length of the list (or the number of its elements).

Example:

``````my_list = ["hello", "slingacademy.com", 123, None, True, False]
length = len(my_list)
print(f"Length of my_list is {length}")``````

Output:

``Length of my_list is 6``

The `len()` function is the easiest and most common way to get the length of a list in Python. Its syntax is concise, and it works efficiently.

## Ignoring None when counting elements in a list

The `len()` function does not check the value or type of the elements in the list, it only counts how many elements there are. Therefore, `None` elements are considered valid elements and are included in the length of the list.

If you want to ignore `None` elements when counting the elements in a list, chose one of the following approaches to go with.

### Using list comprehension

You can use list comprehension to create a new list that contains only the non-None elements of the original list and then use the `len()` function to get its length.

Example:

``````my_list = ["Sling", None, "Academy", None, "dot com"]

# create a new list with non-None elements
non_none_lst = [x for x in my_list if x is not None]

# get the length of the new list
length = len(non_none_lst)

# print the length
print(length) ``````

Output:

``3``

### Using the sum() function

You can use the `sum()` function to add up the number of non-None elements in the original list by using a generator expression that returns 1 for each non-None element and `0` for each `None` element.

Example:

``````mixed_list = ["turtle", None, "tortoise", None, "wolf"]

# sum up the number of non-None elements
count = sum(1 for x in mixed_list if x is not None)

# print the result
print(count)``````

Output:

``3``

### Using a for loop and a counter variable

What we’ll do is Iterating over the list using a `for` loop and increment a counter variable in each iteration if the element is not `None`.

Example:

``````# Creating a list
my_list = [1, 2, 3, 4, 5, None, 6, None]

# Counting the number of not-None elements
count = 0
for element in my_list:
if element is not None:
count += 1

# Printing the count
print(count)``````

Output:

``6``
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