## DEV Community # Count Occurrences in List Python Ways to count occurrences of the list items in Python

### Introduction

Hey guys,
hope you all are doing well during this crisis. I have been coding in python for a while and came across a situation where I had to count some occurrences for a particular element in the list and I came across a few cool techniques to do this. So, let's get started.

### Count

well, this is the most interesting and easy method to use, let's look at an example

``````>>> l = ['a', 'a', 'a', 'a', 'a', 'b', 'b', 'b', 'b', 'c', 'c', 'c', 'd', 'd', 'e']
>>> l.count('a')
5
>>> l.count('e')
1
``````

we can also use this method to get a count of all distinct values at once.

``````>>> l = ['a', 'a', 'a', 'a', 'a', 'b', 'b', 'b', 'b', 'c', 'c', 'c', 'd', 'd', 'e']

>>> [[x,l.count(x)] for x in set(l)]
[['d', 2], ['b', 4], ['c', 3], ['e', 1], ['a', 5]]

>>> dict((x,l.count(x)) for x in set(l))
{'d': 2, 'b': 4, 'c': 3, 'e': 1, 'a': 5}
``````

### operator

In this method, you have to import the `operator` module. Let's have a quick example

``````>>> l = ['a', 'a', 'a', 'a', 'a', 'b', 'b', 'b', 'b', 'c', 'c', 'c', 'd', 'd', 'e']

>>> import operator as op

>>> op.countOf(l,'a')
5
``````

let's go to the next method

### Counter

Here you have to import `Counter` from the `collections` module.

``````>>> l = ['a', 'a', 'a', 'a', 'a', 'b', 'b', 'b', 'b', 'c', 'c', 'c', 'd', 'd', 'e']

>>> from collections import Counter

>>> Counter(l)
Counter({'a': 5, 'b': 4, 'c': 3, 'd': 2, 'e': 1})
``````

This can also be used to get a count for a single element

``````>>> from collections import Counter

>>> c = Counter(l)

>>> c['a']
5
``````

### Pandas

pandas is a very popular library and it can also be used for this purpose

``````>>> import pandas as pd

>>> l = ['a', 'a', 'a', 'a', 'a', 'b', 'b', 'b', 'b', 'c', 'c', 'c', 'd', 'd', 'e']

>>> my_count = pd.Series(l).value_counts()

>>> my_count
a    5
b    4
c    3
d    2
e    1
dtype: int64
``````

in case if you are looking for a count of a particular element

``````# you should run steps in the previous snippet before running this i.e. importing pandas, etc
>>> my_count['a']
5
``````

### loop & Dict

This is the fastest way among all the above, let's go to an example

``````>>> def countElement(a):
...     g = {}
...     for i in a:
...         if i in g:
...             g[i] +=1
...         else:
...             g[i] =1
...     return g
...
>>> countElement(l)
{'a': 5, 'b': 4, 'c': 3, 'd': 2, 'e': 1}
``````

Well, this is it for the post. Hope you enjoyed it and it was helpful to you in some way.

Have a great day,
Happy Learning. 