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# Python | Operator.countOf

• Last Updated : 30 Sep, 2019

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

Syntax : Operator.countOf(freq = a, value = b)
Parameters :
freq : It can be list or any other data type which store value
value : It is value for which we have to count the number of occurrences

Returns: Count of number of occurrences of value.

Example #1: Use `Operator.countOf()` to count the number of occurrences of given value in a list.

 `# Python program showing``# use of countOf() function``# in a list`` ` `from` `operator ``import` `*` `arr ``=` `[ ``1``, ``2``, ``3``, ``3``, ``3` `]``arr1 ``=` `[ ``'a'``, ``'b'``, ``'c'``, ``'b'``, ``'d'` `]`` ` `print``(``"Number of occurrence of b in arr1 ="``, countOf(arr1, ``"b"``))``print``(``"Number of occurrence of e in arr1 ="``, countOf(arr1, ``"e"``))``print``(``"Number of occurrence of 3 in arr ="``, countOf(arr, ``3``))`

Output:

```Number of occurrence of b in arr1 = 2
Number of occurrence of e in arr1 = 0
Number of occurrence of 3 in arr = 3
```

Example #2: Use `Operator.countOf()` to count the number of occurrences of given value in a dictionary.

 `# Python program showing``# use of countOf() function``# in a dictionary`` ` `from` `operator ``import` `*`` ` `d ``=` `{``"score"``: ``3``, ``"score1"``: ``1``, ``"score2"``: ``3``, ``"score3"``: ``1``, ``"score4"``: ``3``}`` ` `print``(``"Number of occurrence of three in dict ="``,countOf(d.values(),``3``))``print``(``"Number of occurrence of one in dict ="``,countOf(d.values(),``1``))``print``(``"Number of occurrence of four in dict ="``,countOf(d.values(),``4``))`

Output :

```Number of occurrence of three in dict = 3
Number of occurrence of one in dict = 2
Number of occurrence of four in dict = 0
```

Example #3: Use `Operator.countOf()` to count the number of occurrences of given value in a tuples.

 `# Python program showing``# use of countOf() function``# in a tuples`` ` `from` `operator ``import` `*``  ` `tup ``=` `( ``1``, ``2``, ``3``, ``3``, ``3` `)``tup1 ``=` `( ``'a'``, ``'b'``, ``'c'``, ``'b'``, ``'d'` `)``  ` `print``(``"Number of occurrence of b in tuple1 ="``,countOf(tup1,``"b"``))``print``(``"Number of occurrence of e in tuple1 ="``,countOf(tup1,``"e"``))``print``(``"Number of occurrence of 3 in tuple ="``,countOf(tup,``3``))`

Output :

```Number of occurrence of b in tuple1 = 2
Number of occurrence of e in tuple1 = 0
Number of occurrence of 3 in tuple = 3
```

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