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Python – Merge List value Keys to Matrix

  • Last Updated : 10 May, 2020

Sometimes, while working with Python dictionary, we can have a problem in which we need to perform the merger of certain keys in dictionary. In this, we tend to form a matrix of resultant singular key. This kind of problem can have applications in data domains. Let’s discuss certain way in which this task can be performed.

Input : test_dict = {‘Maths’: [1, 2], ‘gfg’: [4, 5], ‘CS’: [6]}
Output : {‘merge_key’: [[4, 5], [6], [1, 2]]}

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Input : test_dict = {‘Maths’: [1], ‘gfg’: [4], ‘CS’: [9]}
Output : {‘merge_key’: [[4], [9], [1]]}



Method : Using loop + pop()
This task can be performed using brute force manner. In this, we iterate the keys and remove the keys using pop, reinitialize them after merging into a matrix.




# Python3 code to demonstrate working of 
# Merge List value Keys to Matrix
# Using loop + pop()
  
# initializing dictionary
test_dict = {'gfg' : [4, 5, 6], 
             'is' : [8, 8, 9],
             'CS' : [1, 3, 8], 
             'Maths' : [1, 2]}
  
# printing original dictionary
print("The original dictionary : " + str(test_dict))
  
# initializing list 
que_list = ['gfg', 'CS', 'Maths']
  
# Merge List value Keys to Matrix
# Using loop + pop()
new_data = [test_dict.pop(ele) for ele in que_list]
test_dict["merge_key"] = new_data
  
# printing result 
print("The dictionary after merging : " + str(test_dict)) 
Output :

The original dictionary : {‘is’: [8, 8, 9], ‘gfg’: [4, 5, 6], ‘Maths’: [1, 2], ‘CS’: [1, 3, 8]}
The dictionary after merging : {‘is’: [8, 8, 9], ‘merge_key’: [[4, 5, 6], [1, 3, 8], [1, 2]]}

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