Python how many in list

Then you can count the size of the set to get the count of the unique items. Duplicated items are also known as repeated elements. You can do this by counting the occurrence of each item and if the count is more than 1, then you can add it to a list called duplicated , if the item is not already added. This list holds only the duplicated elements. You can count the length of this duplicated list to get the count of duplicate items in the list.

You can also print the duplicated to know the duplicated items. In the sample list, the items b , e , m are duplicated. You can count the matching elements in the list using the list.

The list. For example, if you want to count occurrences of number 5 in the list, you can use lst. As per the doc, Counter is a dict subclass that can be used to count the hashable objects in the collection.

In the sample list, the number 5 occurs 3 times. You can do this also by using the counter function. Python if Statement. Python Lists. Dictionaries in Python. Popular Examples Add two numbers.

Check prime number. Find the factorial of a number. Print the Fibonacci sequence. Check leap year. Reference Materials Built-in Functions. Remember that lists can have a combination of integers, floats, strings, booleans, other lists, etc. There are different ways to get the number of elements in a list. The approaches vary whether you want to count nested lists as one element or all the elements in the nested lists, or whether you're only interested in unique elements, and similar.

The most straightforward way to get the number of elements in a list is to use the Python built-in function len. As the name function suggests, len returns the length of the list, regardless of the types of elements in it.

Another way we can do this is to create a function that loops through the list using a for loop. We first initialize the count of the elements to 0 and every time a loop iteration is performed, the count increases by 1. The loop ends when it iterates over all the elements, therefore the count will represent the total number of elements in the list:.

This is a much more verbose solution compared to the len function, but it is worth going through it as we will see later in the article that the same idea can be applied when we're dealing with a list of lists. Additionally, you might want to perform some operation either on the elements themselves or an operation in general, which is possible here.

Lists can have multiple elements, including duplicates. If we want to get the number of elements without duplicates unique elements we can use another built-in function set. This function creates a set object, which rejects all duplicate values. Legal Privacy Policy Terms. Register to vote on and add code examples.