Python – Convert Flat dictionaries to Nested dictionary

Last Updated : 14 May, 2020

Sometimes, while working with records, we can have problem in which we need to perform the task of conversion of multiple flat dictionaries to a single nested dictionary. This can have application in many domains in which data is used extensively. Lets discuss certain ways in which this task can be performed.

Method #1 : Using dict() + key access
This is one of the way in which this task can be performed. In this, we construct empty dictionary using dict and assign a new level to dictionary using manual brute key access.

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning - Basic Level Course

# Python3 code to demonstrate working of 
# Convert Flat dictionaries to Nested dictionary
# Using key access + dict()
  
# initializing dictionaries
test_dict1 = {'gfg' : 1, 'best' : 2}
test_dict2 = {'for' : 3, 'geeks' : 5}
  
# printing original dictionaries
print("The original dictionary 1 is : " + str(test_dict1))
print("The original dictionary 2 is : " + str(test_dict2))
  
# Convert Flat dictionaries to Nested dictionary
# Using key access + dict()
res = dict()
res["level1"] = test_dict1
res['level2'] = test_dict2
  
# printing result 
print("The nested dictionary is : " + str(res)) 

Output :

The original dictionary 1 is : {‘gfg’: 1, ‘best’: 2}
The original dictionary 2 is : {‘geeks’: 5, ‘for’: 3}
The nested dictionary is : {‘level2’: {‘geeks’: 5, ‘for’: 3}, ‘level1’: {‘gfg’: 1, ‘best’: 2}}

Method #2 : Using zip()
This is another way in which this task can be performed. In this we link inner keys to outer keys using zip().

# Python3 code to demonstrate working of 
# Convert Flat dictionaries to Nested dictionary
# Using zip()
  
# initializing dictionaries
test_dict1 = {'gfg' : 1, 'best' : 2}
test_dict2 = {'for' : 3, 'geeks' : 5}
  
# printing original dictionaries
print("The original dictionary 1 is : " + str(test_dict1))
print("The original dictionary 2 is : " + str(test_dict2))
  
# Convert Flat dictionaries to Nested dictionary
# Using zip()
key_dict = ['level1', 'level2']
dict_list = [test_dict1, test_dict2]
res = dict(zip(key_dict, dict_list))
  
# printing result 
print("The nested dictionary is : " + str(res)) 

Output :

The original dictionary 1 is : {‘gfg’: 1, ‘best’: 2}
The original dictionary 2 is : {‘geeks’: 5, ‘for’: 3}
The nested dictionary is : {‘level2’: {‘geeks’: 5, ‘for’: 3}, ‘level1’: {‘gfg’: 1, ‘best’: 2}}

My Personal Notes

Related Articles

Table of Contents

Python – Convert Flat dictionaries to Nested dictionary