Python |获取字典中给定值 N 的键数
在本文中，我们将看到如何在给定的字典中获取具有某个给定值 N 的键的数量。有多种方法可以完成这项任务。让我们借助例子来看看它们。
简单方法–
# Python3 code to Get the number of keys
# with given value N in dictionary
# Initialize dictionary
test_dict = {'gfg' : 1, 'is' : 2, 'best' : 3, 'for' : 2, 'CS' : 2}
# printing original dictionary
print("The original dictionary : " + str(test_dict))
# Initialize value
N = 2
# Using loop
# Selective key values in dictionary
res = 0
for key in test_dict:
if test_dict[key] == N:
res = res + 1
# printing result
print("Frequency of N is : " + str(res))
输出:
The original dictionary : {'CS': 2, 'for': 2, 'is': 2, 'gfg': 1, 'best': 3}
Frequency of N is : 3
方法 2: 使用 sum() +值()
# Python3 code to Get the number of keys
# with given value N in dictionary
# Using sum() + values()
# Initialize dictionary
test_dict = {'gfg' : 1, 'is' : 2, 'best' : 3, 'for' : 2, 'CS' : 2}
# printing original dictionary
print("The original dictionary : " + str(test_dict))
# Initialize value
N = 2
# Using sum() + values()
# Selective key values in dictionary
res = sum(x == N for x in test_dict.values())
# printing result
print("Frequency of K is : " + str(res))
输出:
The original dictionary : {'is': 2, 'for': 2, 'gfg': 1, 'best': 3, 'CS': 2}
Frequency of K is : 3
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