Python | Count occurrences of an element in a list

• Difficulty Level : Easy
• Last Updated : 21 Apr, 2021

Given a list in Python and a number x, count 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 (Simple approach)
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 (Using count())
The idea is to use list method count() to count 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 2 (Using Counter())
Counter method returns a dictionary with occurrences of all elements as a key-value pair, where key is the element and 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```

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