# Python | Operator.countOf

`Operator.countOf()` is used to count the number of occurrences of ` b ` in ` a `. Counts the number of occurrences of a 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 a given value in the list.

 ` # Show Python program ` ` # using the countOf () function ` ` # in the list ` ` `  ` from ` ` operator ` ` impo rt ` ` * `  ` 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 ` `)) `

Exit:

` 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 a given value in the dictionary.

 ` # Show Python program ` ` # use countOf function () ` ` # in the 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:

< pre> 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 a given value in tuples.

 ` # Show Python program ` ` # using the countOf () function ` ` # in 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 = " < code class = "plain">, 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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