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Python – Test for Even values dictionary values lists

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  • Last Updated : 01 Aug, 2020
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Given a dictionary with lists as values, map Boolean values depending upon all values in List are Even or not.

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.

Method #1 : Using loop

This is brute way in which this task can be performed. In this, we iterate for all the values and check if all list values are Even if yes, we assign key as True else 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)) 

Output

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}

Method #2 :  Using all() + dictionary comprehension

This is yet another way in which this task can be performed. In this, we check for all the elements using all() and dictionary comprehension is used to remake the result.

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)) 

Output

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}

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