从字典中的第 K 个键的值中删除第 N 个元素的Python程序

给定一个带有值列表的字典，我们的任务是编写一个Python程序来从第 K 个键的值中删除 N 个元素。

例子：

Input : test_dict = {“gfg” : [9, 4, 5, 2, 3, 2], “is” : [1, 2, 3, 4, 3, 2], “best” : [2, 2, 2, 3, 4]}, K, N = “gfg”, 2

Output : {‘gfg’: [9, 4, 5, 3], ‘is’: [1, 2, 3, 4, 3, 2], ‘best’: [2, 2, 2, 3, 4]}

Explanation : 2 removed from “gfg” key’s value list.

Input : test_dict = {“gfg” : [9, 4, 5, 2, 3, 2], “is” : [1, 2, 3, 4, 3, 2], “best” : [2, 2, 2, 3, 4]}, K, N = “gfg”, 4

Output : {‘gfg’: [9, 5, 2, 3, 2], ‘is’: [1, 2, 3, 4, 3, 2], ‘best’: [2, 2, 2, 3, 4]}

Explanation : 4 removed from “gfg” key’s value list.

方法#1：使用循环+条件语句

在这种情况下，所有键及其值的重新分配都完成了，当 K 键出现时，其值列表中的 N 出现被忽略。

Python3

# Python3 code to demonstrate working of
# Remove N from K key's value in dictionary values list
# Using loop + conditional statements
  
# initializing dictionary
test_dict = {"gfg" : [9, 4, 5, 2, 3, 2],
             "is" : [1, 2, 3, 4, 3, 2],
             "best" : [2, 2, 2, 3, 4]}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# initializing K, N 
K, N = "gfg", 2
  
res = dict()
for key, val in test_dict.items():
      
    # reassigning omitting desired number
    res[key] = (val if key != K else [idx for idx in val if idx != N])
  
# printing result
print("The altered dictionary : " + str(res))

输出：

The original dictionary is : {‘gfg’: [9, 4, 5, 2, 3, 2], ‘is’: [1, 2, 3, 4, 3, 2], ‘best’: [2, 2, 2, 3, 4]}

The altered dictionary : {‘gfg’: [9, 4, 5, 3], ‘is’: [1, 2, 3, 4, 3, 2], ‘best’: [2, 2, 2, 3, 4]}

方法#2：使用字典理解

在这种情况下，我们执行与上述方法类似的任务，不同之处在于使用字典理解而不是使用传统循环遍历键。

蟒蛇3

# Python3 code to demonstrate working of
# Remove N from K key's value in dictionary values list
# Using dictionary comprehension
  
# initializing dictionary
test_dict = {"gfg" : [9, 4, 5, 2, 3, 2],
             "is" : [1, 2, 3, 4, 3, 2], 
             "best" : [2, 2, 2, 3, 4]}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# initializing K, N 
K, N = "gfg", 2
  
# dictionary comprehension used for shorthand
res = {key : (val if key != K else [idx for idx in val if idx != N]) for key, val in test_dict.items()}
  
# printing result
print("The altered dictionary : " + str(res))

输出：

The original dictionary is : {‘gfg’: [9, 4, 5, 2, 3, 2], ‘is’: [1, 2, 3, 4, 3, 2], ‘best’: [2, 2, 2, 3, 4]}

The altered dictionary : {‘gfg’: [9, 4, 5, 3], ‘is’: [1, 2, 3, 4, 3, 2], ‘best’: [2, 2, 2, 3, 4]}