Operator.countOf()用于计数出现的次数b在a。它计算值的出现次数。
用法： Operator.countOf(freq = a, value = b)
参数:
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
返回值：值出现次数的计数。
范例1：采用Operator.countOf()计算列表中给定值的出现次数。
# 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))输出：
Number of occurrence of b in arr1 = 2 Number of occurrence of e in arr1 = 0 Number of occurrence of 3 in arr = 3
范例2：采用Operator.countOf()计算字典中给定值的出现次数。
# 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))输出：
Number of occurrence of three in dict = 3 Number of occurrence of one in dict = 2 Number of occurrence of four in dict = 0
范例3：采用Operator.countOf()计算元组中给定值出现的次数。
# 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))输出：
Number of occurrence of b in tuple1 = 2 Number of occurrence of e in tuple1 = 0 Number of occurrence of 3 in tuple = 3
相关用法
注：本文由纯净天空筛选整理自garg_ak0109大神的英文原创作品 Python | Operator.countOf。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。