Python–键值等频
原文:https://www . geesforgeks . org/python-key-values-equal-frequency/
给定一个字典，统计键等于值的实例。
输入 : test_dict = {5:5，8:9，7:8，1:2，10:10，4:8} 输出 : 2 解释:在 2 个实例中，键等于值。
输入 : test_dict = {5:4，8:9，7:8，1:2，10:10，4:8} 输出 : 1 解释:在 1 个实例中，key 等于 value。
方法#1:使用循环
在这种情况下，我们计算键等于值的实例，并相应地增加计数器。
Python 3
# Python3 code to demonstrate working of
# Keys Values equal frequency
# Using loop
# initializing dictionary
test_dict = {5: 5, 8: 9, 7: 7, 1: 2, 10: 10, 4: 8}
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
res = 0
for key in test_dict:
# checking for equality and incrementing counter
if key == test_dict[key]:
res += 1
# printing result
print("The required frequency : " + str(res))
Output
The original dictionary is : {5: 5, 8: 9, 7: 7, 1: 2, 10: 10, 4: 8}
The required frequency : 3
在这种情况下，使用 sum()执行计数任务，当找到相等的键值时，将 1 追加到列表中，然后在末尾对每个值求和。
Python 3
# Python3 code to demonstrate working of
# Keys Values equal frequency
# Using sum() + list comprehension
# initializing dictionary
test_dict = {5: 5, 8: 9, 7: 7, 1: 2, 10: 10, 4: 8}
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
# computing summation to get frequency
res = sum([1 for key in test_dict if key == test_dict[key]])
# printing result
print("The required frequency : " + str(res))
Output
The original dictionary is : {5: 5, 8: 9, 7: 7, 1: 2, 10: 10, 4: 8}
The required frequency : 3
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