Python | Get all tuple keys from dictionary

Last Updated : 18 Oct, 2019

Sometimes, while working with Python dictionaries, we can have it’s keys in form of tuples. A tuple can have many elements in it and sometimes, it can be essential to get them. If they are a part of a dictionary keys and we desire to get all the tuple key elements, we need to perform certain functionalities to achieve this. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using list comprehension
In this method, we just iterate through the each dictionary item and get it’s key’s elements into a list.

# Python3 code to demonstrate working of
# Get all tuple keys from dictionary
# Using list comprehension
  
# Initializing dict
test_dict = {(5, 6) : 'gfg', (1, 2, 8) : 'is', (9, 10) : 'best'}
  
# printing original dict
print("The original dict is : " + str(test_dict))
  
# Get all tuple keys from dictionary
# Using list comprehension
res = [ele for key in test_dict for ele in key]
  
# printing result
print("The dictionary tuple key elements are : " + str(res))

Output :

The original dict is : {(5, 6): 'gfg', (9, 10): 'best', (1, 2, 8): 'is'}
The dictionary tuple key elements are : [5, 6, 9, 10, 1, 2, 8]

Method #2 : Using chain.from_iterable()
This task can be performed in more compact form, using one word instead of one-line by using from_iterable(), which internally accesses the tuple elements and stores in list.

# Python3 code to demonstrate working of
# Get all tuple keys from dictionary
# Using chain.from_iterable()
from itertools import chain
  
# Initializing dict
test_dict = {(5, 6) : 'gfg', (1, 2, 8) : 'is', (9, 10) : 'best'}
  
# printing original dict
print("The original dict is : " + str(test_dict))
  
# Get all tuple keys from dictionary
# Using chain.from_iterable()
res = list(chain.from_iterable(test_dict))
  
# printing result
print("The dictionary tuple key elements are : " + str(res))

Output :

The original dict is : {(5, 6): 'gfg', (9, 10): 'best', (1, 2, 8): 'is'}
The dictionary tuple key elements are : [5, 6, 9, 10, 1, 2, 8]

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