# Python | Count occurrences of an element in a list

• Difficulty Level : Easy
• Last Updated : 05 Jul, 2022

Given a list in Python and a number x, count the number of occurrences of x in the given list.

Examples:

```Input : lst = [15, 6, 7, 10, 12, 20, 10, 28, 10]
x = 10
Output : 3
10 appears three times in given list.

Input : lst = [8, 6, 8, 10, 8, 20, 10, 8, 8]
x = 16
Output : 0```

### Method 1: Count Occurrences of Element in Python List using a loop in python

We keep a counter that keeps on increasing if the required element is found in the list.

## Python3

 `# Python code to count the number of occurrences``def` `countX(lst, x):``    ``count ``=` `0``    ``for` `ele ``in` `lst:``        ``if` `(ele ``=``=` `x):``            ``count ``=` `count ``+` `1``    ``return` `count` `# Driver Code``lst ``=` `[``8``, ``6``, ``8``, ``10``, ``8``, ``20``, ``10``, ``8``, ``8``]``x ``=` `8``print``(``'{} has occurred {} times'``.``format``(x, countX(lst, x)))`

Output:

`8 has occurred 5 times`

### Method 2: Count Occurrences of Element in Python List using count()

The idea is to use the list method count() to count the number of occurrences.

## Python3

 `# Python code to count the number of occurrences``def` `countX(lst, x):``    ``return` `lst.count(x)` `# Driver Code``lst ``=` `[``8``, ``6``, ``8``, ``10``, ``8``, ``20``, ``10``, ``8``, ``8``]``x ``=` `8``print``(``'{} has occurred {} times'``.``format``(x, countX(lst, x)))`

Output:

`8 has occurred 5 times `

### Method 3: Count Occurrences of Element in Python List using Counter()

The counter method returns a dictionary with occurrences of all elements as a key-value pair, where the key is the element and the value is the number of times that element has occurred.

## Python3

 `from` `collections ``import` `Counter` `# declaring the list``l ``=` `[``1``, ``1``, ``2``, ``2``, ``3``, ``3``, ``4``, ``4``, ``5``, ``5``]` `# driver program``x ``=` `3``d ``=` `Counter(l)``print``(``'{} has occurred {} times'``.``format``(x, d[x]))`

Output:

`3 has occurred 2 times`

### Method 4: Count Occurrences of Element in Python List using countof() method

Operator.countOf() is used for counting the number of occurrences of b in a. It counts the number of occurrences of value. It returns the Count of a number of occurrences of value.

## Python3

 `import` `operator as op` `# declaring the list``l ``=` `[``1``, ``1``, ``2``, ``2``, ``2``, ``3``, ``3``, ``4``, ``4``, ``5``, ``5``]` `# driver program``x ``=` `2``print``(f``"{x} has occurred {op.countOf(l, x)} times"``)`

Output:

`2 has occurred 3 times`

### Method 5: Count the Number of Occurrences using a dictionary comprehension

Python allows dictionary comprehensions. We can create dictionaries using simple expressions. A dictionary comprehension takes the form {key: value for (key, value) in iterable}

## Python3

 `lis ``=` `[``'a'``, ``'d'``, ``'d'``, ``'c'``, ``'a'``, ``'b'``, ``'b'``, ``'a'``, ``'c'``, ``'d'``, ``'e'``]``occurrence ``=` `{item: lis.count(item) ``for` `item ``in` `lis}``print``(occurrence.get(``'e'``))`

Output:

`1`

### Method 6: Using the panda’s library

Pandas Series.value_counts() function return a Series containing counts of unique values. The resulting object will be in descending order so that the first element is the most frequently-occurring element.

## Python3

 `import` `pandas as pd` `# declaring the list``l ``=` `[``1``, ``1``, ``2``, ``2``, ``2``, ``3``, ``3``, ``4``, ``4``, ``5``, ``5``]` `count ``=` `pd.Series(l).value_counts()``print` `(``"Element    Count"``)``print``(count)`

Output:

```Element    Count
2    3
1    2
3    2
4    2
5    2
dtype: int64```

My Personal Notes arrow_drop_up