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Transpose Dual Tuple List in Python

  • Last Updated : 01 Aug, 2020

Sometimes, while working with Python tuples, we can have a problem in which we need to perform tuple transpose of elements i.e, each column element of dual tuple becomes a row, a 2*N Tuple becomes N * 2 Tuple List. This kind of problem can have possible applications in domains such as web development and day-day programming. Let’s discuss certain ways in which this task can be performed.

Input : test_list = [(2, 'Gfg'), (3, 'is'), (94, 'Best')]
Output : ([2, 3, 94], ['Gfg', 'is', 'Best'])
Input : test_list = [(8, 1)]
Output : ([8, 1])

Method #1: Using loop

This is one of the ways in which this problem can be solved. In this, we employ a brute force strategy to perform the transpose by constructing 2 lists and combining them to get the transposed results.




# Python3 code to demonstrate working of 
# Transpose Tuple List
# Using loop
  
# hlper_fnc function
def hlper_fnc(test_list):
    # declare empty list
    sub1 = []
    sub2 = []
  
    res = (sub1, sub2)
    for sub in test_list:
        # add element in the last of the list
        sub1.append(sub[0])
        sub2.append(sub[1])
  
    return res
  
# initializing list
test_list = [(5, 1), (3, 4), (9, 7), (10, 6)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Transpose Tuple List
# Using loop
res = hlper_fnc(test_list)
  
# printing result 
print("The transposed tuple list : " + str(res)) 

Output:

The original list is : [(5, 1), (3, 4), (9, 7), (10, 6)]
The transposed tuple list : ([5, 3, 9, 10], [1, 4, 7, 6])

Method #2 : Using loop + zip() + tuple()

The combination of above functionalities can also be used to solve this problem. In this, we perform the task of forming transpose and extract columner elements using zip().




# Python3 code to demonstrate working of 
# Transpose Tuple List
# Using zip() + tuple()
  
# hlper_fnc function
def hlper_fnc(test_list):
    return tuple(zip(*test_list))
  
# initializing list
test_list = [(5, 1), (3, 4), (9, 7), (10, 6)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Transpose Tuple List
# Using zip() + tuple()
sub1, sub2 = hlper_fnc(test_list) 
res = (list(sub1), list(sub2))
  
# printing result 
print("The transposed tuple list : " + str(res)) 

Output:

The original list is : [(5, 1), (3, 4), (9, 7), (10, 6)]
The transposed tuple list : ([5, 3, 9, 10], [1, 4, 7, 6])

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