Skip to content
Related Articles

Related Articles

Improve Article
Python – Convert tuple list to dictionary with key from a given start value
  • Last Updated : 12 Nov, 2020

Given a tuple list, the following article focuses on how to convert it to a dictionary, with keys starting from a specified start value. This start value is only to give a head start, next keys will incremented value of their previous keys. 

Input : test_list = [(4, 5), (1, 3), (9, 4), (8, 2), (10, 1)], start = 4 
Output : {4: (4, 5), 5: (1, 3), 6: (9, 4), 7: (8, 2), 8: (10, 1)} 
Explanation : Tuples indexed starting key count from 4.
Input : test_list = [(4, 5), (1, 3), (9, 4), (8, 2), (10, 1)], start = 6 
Output : {6: (4, 5), 7: (1, 3), 8: (9, 4), 9: (8, 2), 10: (10, 1)} 
Explanation : Tuples indexed starting key count from 6. 

Method 1 : Using loop

In this we construct the dictionary by iterating through each tuple and adding its position index, starting from start, as key – value pair in dictionary.

Python3




# initializing list
test_list = [(4, 5), (1, 3), (9, 4), (8, 2), (10, 1)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing start
start = 4
  
res = dict()
for sub in test_list:
  
    # assigning positional index
    res[start] = sub
    start += 1
  
# printing result
print("Constructed dictionary : " + str(res))

Output:



The original list is : [(4, 5), (1, 3), (9, 4), (8, 2), (10, 1)]

Constructed dictionary : {4: (4, 5), 5: (1, 3), 6: (9, 4), 7: (8, 2), 8: (10, 1)}

Method 2 : Using dict() and enumerate()

In this, we convert tuple list to dictionary using dict(), and indexing is provided using enumerate().

Python3




# initializing list
test_list = [(4, 5), (1, 3), (9, 4), (8, 2), (10, 1)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing start
start = 4
  
res = dict(enumerate(test_list, start=start))
  
# printing result
print("Constructed dictionary : " + str(res))

Output:

The original list is : [(4, 5), (1, 3), (9, 4), (8, 2), (10, 1)]

Constructed dictionary : {4: (4, 5), 5: (1, 3), 6: (9, 4), 7: (8, 2), 8: (10, 1)}

 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




My Personal Notes arrow_drop_up
Recommended Articles
Page :