Python – 提取 K 键值的第 i 个元素

给定一个字典，提取 K 键值列表的第 i 个元素。

Input : test_dict = {‘Gfg’ : [6, 7, 3, 1], ‘is’ : [9, 1, 4], ‘best’ : [10, 7, 4]}, K = ‘Gfg’, i = 1 
Output : 7 
Explanation : 1st index of ‘Gfg”s value is 7.

Input : test_dict = {‘Gfg’ : [6, 7, 3, 1], ‘is’ : [9, 1, 4], ‘best’ : [10, 7, 4]}, K = ‘best’, i = 0 
Output : 10 
Explanation : 0th index of ‘best”s value is 10. 
 

方法：使用 + get()

这是可以执行此任务的方式之一。在此，我们使用 get() 提取键的值，然后在检查 K 是否小于列表长度后提取值。

Python3

# Python3 code to demonstrate working of
# Extract ith element of K key's value
# Using get()
 
# initializing dictionary
test_dict = {'Gfg' : [6, 7, 3, 1],
             'is' : [9, 1, 4],
             'best' : [10, 7, 4]}
 
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
 
# initializing K
K = 'Gfg'
 
# initializing i
i = 2
 
# using get() to get the required value
temp = test_dict.get(K)
res = None
# checking for non empty dict and length constraints
if temp and len(temp) >= i:  
        res = temp[i]
         
# printing result
print("The extracted value : " + str(res))

输出

The original dictionary is : {'Gfg': [6, 7, 3, 1], 'is': [9, 1, 4], 'best': [10, 7, 4]}
The extracted value : 3