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Python – Group Similar keys in dictionary

  • Last Updated : 22 Apr, 2020

Sometimes while working with dictionary data, we can have problems in which we need to perform grouping based on substring of keys and reform the data grouped on similar keys. This can have application in data preprocessing. Lets discuss certain ways in which this task can be performed.

Method #1 : Using loop
This is brute way in which we perform this task. In this, we check for element using conditional statement and insert the keys according to substring presence.




# Python3 code to demonstrate working of 
# Group Similar keys in dictionary
# Using loop
  
# initializing Dictionary
test_dict = {'gfg1' : 1, 'is1' : 2, 'best1' : 3
            'gfg2' : 9, 'is2' : 8, 'best2' : 7,
            'gfg3' : 10, 'is3' : 5, 'best3' : 6}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# Group Similar keys in dictionary
# Using loop
res = []
res1, res2, res3 = {}, {}, {}
for key, value in test_dict.items():
  if 'gfg' in key:
    res1[key] = value
  elif 'is' in key:
    res2[key] = value
  elif 'best' in key:
    res3[key] = value
  
res.append(res1)
res.append(res2)
res.append(res3)
  
# printing result 
print("The grouped similar keys are : " + str(res)) 
Output :

The original dictionary is : {‘best2’: 7, ‘best3’: 6, ‘is2’: 8, ‘is3’: 5, ‘best1’: 3, ‘gfg1’: 1, ‘gfg3’: 10, ‘is1’: 2, ‘gfg2’: 9}
The grouped similar keys are : [{‘gfg3’: 10, ‘gfg2’: 9, ‘gfg1’: 1}, {‘is2’: 8, ‘is3’: 5, ‘is1’: 2}, {‘best3’: 6, ‘best1’: 3, ‘best2’: 7}]

 

Method #2 : Using dictionary comprehension
This is yet another way in which this task can be performed. In this, we group the substring to keys using dictionary comprehension.




# Python3 code to demonstrate working of 
# Group Similar keys in dictionary
# Using dictionary comprehension
  
# initializing Dictionary
test_dict = {'gfg1' : 1, 'is1' : 2, 'best1' : 3
            'gfg2' : 9, 'is2' : 8, 'best2' : 7,
            'gfg3' : 10, 'is3' : 5, 'best3' : 6}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# Group Similar keys in dictionary
# Using dictionary
res = []
res1 = {key : val for key, val in test_dict.items() if 'gfg' in key}
res2 = {key : val for key, val in test_dict.items() if 'is' in key}
res3 = {key : val for key, val in test_dict.items() if 'best' in key}
res.append(res1)
res.append(res2)
res.append(res3)
  
# printing result 
print("The grouped similar keys are : " + str(res)) 
Output :

The original dictionary is : {‘best2’: 7, ‘best3’: 6, ‘is2’: 8, ‘is3’: 5, ‘best1’: 3, ‘gfg1’: 1, ‘gfg3’: 10, ‘is1’: 2, ‘gfg2’: 9}
The grouped similar keys are : [{‘gfg3’: 10, ‘gfg2’: 9, ‘gfg1’: 1}, {‘is2’: 8, ‘is3’: 5, ‘is1’: 2}, {‘best3’: 6, ‘best1’: 3, ‘best2’: 7}]


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