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Python – Flatten tuple of List to tuple

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  • Last Updated : 26 Jul, 2022
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Sometimes, while working with Python Tuples, we can have a problem in which we need to perform the flattening of tuples, which have lists as its constituent elements. This kind of problem is common in data domains such as Machine Learning. Let’s discuss certain ways in which this task can be performed.

Input : test_tuple = ([5], [6], [3], [8]) Output : (5, 6, 3, 8) Input : test_tuple = ([5, 7, 8]) Output : (5, 7, 8)

Method #1 : Using sum() + tuple() The combination of above functions can be used to solve this problem. In this, we perform the task of flattening using sum(), passing empty list as its argument. 

Python3




# Python3 code to demonstrate working of
# Flatten tuple of List to tuple
# Using sum() + tuple()
 
# initializing tuple
test_tuple = ([5, 6], [6, 7, 8, 9], [3])
 
# printing original tuple
print("The original tuple : " + str(test_tuple))
 
# Flatten tuple of List to tuple
# Using sum() + tuple()
res = tuple(sum(test_tuple, []))
 
# printing result
print("The flattened tuple : " + str(res))

Output : 

The original tuple : ([5, 6], [6, 7, 8, 9], [3])
The flattened tuple : (5, 6, 6, 7, 8, 9, 3)

  Method #2 : Using tuple() + chain.from_iterable() The combination of above functions can be used to solve this problem. In this, we perform task of flattening using from_iterable() and conversion to tuple using tuple(). 

Python3




# Python3 code to demonstrate working of
# Flatten tuple of List to tuple
# Using tuple() + chain.from_iterable()
from itertools import chain
 
# initializing tuple
test_tuple = ([5, 6], [6, 7, 8, 9], [3])
 
# printing original tuple
print("The original tuple : " + str(test_tuple))
 
# Flatten tuple of List to tuple
# Using tuple() + chain.from_iterable()
res = tuple(chain.from_iterable(test_tuple))
 
# printing result
print("The flattened tuple : " + str(res))

Output : 

The original tuple : ([5, 6], [6, 7, 8, 9], [3])
The flattened tuple : (5, 6, 6, 7, 8, 9, 3)

Method #3: Using extend() and tuple() methods

Python3




# Python3 code to demonstrate working of
# Flatten tuple of List to tuple
# initializing tuple
test_tuple = ([5, 6], [6, 7, 8, 9], [3])
 
# printing original tuple
print("The original tuple : " + str(test_tuple))
 
# Flatten tuple of List to tuple
res=[]
for i in test_tuple:
    res.extend(i)
res=tuple(res)
# printing result
print("The flattened tuple : " + str(res))

Output :

The original tuple : ([5, 6], [6, 7, 8, 9], [3])
The flattened tuple : (5, 6, 6, 7, 8, 9, 3)
 


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