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Python – Convert Records List to Segregated Dictionary

  • Last Updated : 11 May, 2020

Sometimes, while working with Python records, we can have a problem in which we need to convert each element of tuple records into a separate key in dictionary, with each index having different value. This kind of problem can have application in data domains. Lets discuss certain ways in which this task can be performed.

Method #1 : Using loop
This is one of the way to solve this problem. In this, we iterate for list of tuples and assign the required value to each key for newly constructed dictionary.




# Python3 code to demonstrate working of 
# Convert Records List to Segregated Dictionary
# Using loop
  
# initializing list
test_list = [(1, 2), (3, 4), (5, 6)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing index value
frst_idx = "Gfg"
scnd_idx = 'best'
  
# Convert Records List to Segregated Dictionary
# Using loop
res = dict()
for sub in test_list:
    res[sub[0]] = frst_idx
    res[sub[1]] = scnd_idx
  
# printing result 
print("The constructed Dictionary list : " + str(res)) 
Output :

The original list is : [(1, 2), (3, 4), (5, 6)]
The constructed Dictionary list : {1: ‘Gfg’, 2: ‘best’, 3: ‘Gfg’, 4: ‘best’, 5: ‘Gfg’, 6: ‘best’}

 



Method #2 : Using zip() + chain() + cycle() + list comprehension
The combination of above functions can be used to perform this task. In this, we unpack the values using chain() and then alternate cycle the values to be initialized and then zip back the values using zip().




# Python3 code to demonstrate working of 
# Convert Records List to Segregated Dictionary
# Using zip() + chain() + cycle() + list comprehension
from itertools import chain, cycle
  
# initializing list
test_list = [(1, 2), (3, 4), (5, 6)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing index value
frst_idx = "Gfg"
scnd_idx = 'best'
  
# Convert Records List to Segregated Dictionary
# Using zip() + chain() + cycle() + list comprehension
res = dict(zip(chain(*test_list), cycle([frst_idx, scnd_idx])))
  
# printing result 
print("The constructed Dictionary list : " + str(res)) 
Output :

The original list is : [(1, 2), (3, 4), (5, 6)]
The constructed Dictionary list : {1: ‘Gfg’, 2: ‘best’, 3: ‘Gfg’, 4: ‘best’, 5: ‘Gfg’, 6: ‘best’}

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