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Python | K modulo on each Dictionary Key

  • Last Updated : 27 Feb, 2020

Sometimes, while working with dictionaries, we might come across a problem in which we require to perform a particular operation on each value of keys like K modulo on each key. This type of problem can occur in web development domain. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using loop
This is the naive method in which this task can be performed. In this we simply run a loop to traverse each key in dictionary and perform the desired operation of K modulo.

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# Python3 code to demonstrate working of
# K modulo on each Dictionary Key
# Using loop
  
# Initialize dictionary
test_dict = {'gfg' : 6, 'is' : 4, 'best' : 7}
  
# printing original dictionary
print("The original dictionary : " + str(test_dict))
  
# initializing K 
K = 4
  
# Using loop
# K modulo on each Dictionary Key
for key in test_dict: 
    test_dict[key] %= 4
  
# printing result 
print("The dictionary after mod K each key's value : " + str(test_dict))
Output :



The original dictionary : {'is': 4, 'best': 7, 'gfg': 6}
The dictionary after mod K each key's value : {'is': 0, 'best': 3, 'gfg': 2}

 

Method #2 : Using update() + dictionary comprehension
An alternate one-liner to perform this task, the combination of above functions can be used to perform this particular task. The update function is used to perform the % K over the dictionary.




# Python3 code to demonstrate working of
# K modulo on each Dictionary Key
# Using update() + dictionary comprehension
  
# Initialize dictionary
test_dict = {'gfg' : 6, 'is' : 4, 'best' : 7}
  
# printing original dictionary
print("The original dictionary : " + str(test_dict))
  
# initializing K 
K = 4
  
# Using update() + dictionary comprehension
# K modulo on each Dictionary Key
test_dict.update((x, y % K) for x, y in test_dict.items())
  
# printing result 
print("The dictionary after mod K each key's value : " + str(test_dict))
Output :
The original dictionary : {'is': 4, 'best': 7, 'gfg': 6}
The dictionary after mod K each key's value : {'is': 0, 'best': 3, 'gfg': 2}



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