Python – 测试偶数值字典值列表

给定一个以列表为值的字典，根据 List 中的所有值映射布尔值是否为偶数。

Input : {“Gfg” : [6, 8, 10], “is” : [8, 10, 12, 16], “Best” : [10, 16, 14, 6]}
Output : {‘Gfg’: True, ‘is’: True, ‘Best’: True}
Explanation : All lists have even numbers.

Input : {“Gfg” : [6, 5, 10], “is” : [8, 10, 11, 16], “Best” : [10, 16, 14, 6]}
Output : {‘Gfg’: False, ‘is’: False, ‘Best’: True}
Explanation : Only “Best” has even numbers.

方法#1：使用循环

这是可以执行此任务的粗暴方式。在此，我们迭代所有值并检查是否所有列表值都是即使是，我们将键分配为 True 否则为 False。

Python3

# Python3 code to demonstrate working of 
# Test for Even values dictionary values lists
# Using loop
  
# initializing dictionary
test_dict = {"Gfg" : [6, 7, 3], 
             "is" :  [8, 10, 12, 16], 
             "Best" : [10, 16, 14, 6]}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
res = dict()
for sub in test_dict:
    flag = 1
      
    # checking for even elements
    for ele in test_dict[sub]:
        if ele % 2 != 0:
            flag = 0
            break
    # adding True if all Even elements
    res[sub] = True if flag else False
  
# printing result 
print("The computed dictionary : " + str(res))

输出

The original dictionary is : {'Gfg': [6, 7, 3], 'is': [8, 10, 12, 16], 'Best': [10, 16, 14, 6]}
The computed dictionary : {'Gfg': False, 'is': True, 'Best': True}

方法 #2：使用 all() + 字典理解

这是可以执行此任务的另一种方式。在此，我们使用 all() 检查所有元素，并使用字典理解来重新制作结果。

Python3

# Python3 code to demonstrate working of 
# Test for Even values dictionary values lists
# Using all() + dictionary comprehension
  
# initializing dictionary
test_dict = {"Gfg" : [6, 7, 3], 
             "is" :  [8, 10, 12, 16], 
             "Best" : [10, 16, 14, 6]}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# using all to check for all even elements
res = {sub : all(ele % 2 == 0 for ele in test_dict[sub]) for sub in test_dict}
  
# printing result 
print("The computed dictionary : " + str(res)) 

输出

The original dictionary is : {'Gfg': [6, 7, 3], 'is': [8, 10, 12, 16], 'Best': [10, 16, 14, 6]}
The computed dictionary : {'Gfg': False, 'is': True, 'Best': True}