Python – Extend consecutive tuples

Given list of tuples, join consecutive tuples.

Input : test_list = [(3, 5, 6, 7), (3, 2, 4, 3), (9, 4), (2, 3, 2)] Output : [(3, 5, 6, 7, 3, 2, 4, 3), (3, 2, 4, 3, 9, 4), (9, 4, 2, 3, 2)] Explanation : Elements joined with their consecutive tuples. Input : test_list = [(3, 5, 6, 7), (3, 2, 4, 3)] Output : [(3, 5, 6, 7, 3, 2, 4, 3)] Explanation : Elements joined with their consecutive tuples.

Method #1 : Using loop

This is brute way in which this task can be performed. In this, we perform task of joining consecution by access inside loop.

Python3

# Python3 code to demonstrate working of
# Extend consecutive tuples
# Using loop

# initializing list
test_list = [(3, 5, 6, 7), (3, 2, 4, 3), (9, 4), (2, 3, 2), (3, ), (3, 6)]

# printing original list
print("The original list is : " + str(test_list))

res = []
for idx in range(len(test_list) - 1):

    # joining tuples
    res.append(test_list[idx] + test_list[idx + 1])

# printing results
print("Joined tuples : " + str(res))

Output

The original list is : [(3, 5, 6, 7), (3, 2, 4, 3), (9, 4), (2, 3, 2), (3, ), (3, 6)]
Joined tuples : [(3, 5, 6, 7, 3, 2, 4, 3), (3, 2, 4, 3, 9, 4), (9, 4, 2, 3, 2), (2, 3, 2, 3), (3, 3, 6)]

Time Complexity: O(n), where n is the length of the input list. 
Auxiliary Space: O(n) additional space of size n is created where n is the number of elements in the list “test_list”. 

Method #2 : Using zip() + list comprehension

In this, we construct consecutive list using zip() and slicing and then form pairs accordingly. 

Python3

# Python3 code to demonstrate working of
# Extend consecutive tuples
# Using zip() + list comprehension

# initializing list
test_list = [(3, 5, 6, 7), (3, 2, 4, 3), (9, 4), (2, 3, 2), (3, ), (3, 6)]

# printing original list
print("The original list is : " + str(test_list))

# zip to combine consecutive elements
res = [a + b for a, b in zip(test_list, test_list[1:])]

# printing results
print("Joined tuples : " + str(res))

Output

The original list is : [(3, 5, 6, 7), (3, 2, 4, 3), (9, 4), (2, 3, 2), (3, ), (3, 6)]
Joined tuples : [(3, 5, 6, 7, 3, 2, 4, 3), (3, 2, 4, 3, 9, 4), (9, 4, 2, 3, 2), (2, 3, 2, 3), (3, 3, 6)]