Python - Join Tuples to Integers in Tuple List

Python – Join Tuples to Integers in Tuple List

Last Updated : 02 Jun, 2020

Sometimes, while working with Python records, we can have a problem in which we need to concatenate all the elements, in order, to convert elements in tuples in List to integer. This kind of problem can have applications in many domains such as day-day and competitive programming. Let’s discuss certain ways in which this task can be performed.

Input : test_list = [(4, 5, 6), (5, 1), (1, 3, 8, 0), (6, 9)]
Output : [456, 51, 1380, 69]
Input : test_list = [(4, 5, 6, 8, 9)]
Output : [45689]

Method #1 : Using loop
This is brute force method in which this task can be performed. In this, we perform join of all the elements using number creation mathematically compute the result.

# Python3 code to demonstrate working of 
# Join Tuples to Integers in Tuple List
# Using loop
  
# helpr_fnc
def join_tup(tup):
    res = tup[0]
    for idx in tup[1:]:
        res = res * 10 + idx
    return res
  
# initializing list
test_list = [(4, 5), (5, 6), (1, 3), (6, 9)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Join Tuples to Integers in Tuple List
# Using loop
res = [join_tup(idx) for idx in test_list]
  
# printing result 
print("The joined result : " + str(res)) 

Output :

The original list is : [(4, 5), (5, 6), (1, 3), (6, 9)]
The joined result : [45, 56, 13, 69]

Method #2 : Using map() + join() + int()
The combination of above functions can be used to solve the problem. In this, we perform concatenation by string conversion, joining using join() and int() is used to convert result back to integer.

# Python3 code to demonstrate working of 
# Join Tuples to Integers in Tuple List
# Using map() + join() + int()
  
# initializing list
test_list = [(4, 5), (5, 6), (1, 3), (6, 9)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Join Tuples to Integers in Tuple List
# Using map() + join() + int()
res = [int(''.join(map(str, idx))) for idx in test_list]
  
# printing result 
print("The joined result : " + str(res)) 

Output :

The original list is : [(4, 5), (5, 6), (1, 3), (6, 9)]
The joined result : [45, 56, 13, 69]

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