How to iterate through list of tuples in Python

Python – Create list of tuples using for loop

Last Updated : 18 Apr, 2023

In this article, we will discuss how to create a List of Tuples using for loop in Python.

Let’s suppose we have a list and we want a create a list of tuples from that list where every element of the tuple will contain the list element and its corresponding index.

Method 1: Using For loop with append() method

Here we will use the for loop along with the append() method. We will iterate through elements of the list and will add a tuple to the resulting list using the append() method.

Example:

Python3

L = [5, 4, 2, 5, 6, 1]
res = []
 
for i in range(len(L)):
    res.append((L[i], i))
     
print("List of Tuples")
print(res)

Output

List of Tuples
[(5, 0), (4, 1), (2, 2), (5, 3), (6, 4), (1, 5)]

Method 2: Using For loop with enumerate() method

Enumerate() method adds a counter to an iterable and returns it in a form of enumerating object. So we can use this function to create the desired list of tuples.

Example:

Python3

L = [5, 4, 2, 5, 6, 1]
res = []
 
for index, element in enumerate(L):
    res.append((element, index))
     
print("List of Tuples")
print(res)

Output

List of Tuples
[(5, 0), (4, 1), (2, 2), (5, 3), (6, 4), (1, 5)]

Method 3: Using zip() function

Using Python’s zip() function we can create a list of tuples, for that we will require two lists.

Step-by-step approach:

Firstly, initialize two variables that will hold some values as a list and the other one will hold the indexes of those values as a list.
Then use another variable in which we will hold the result of our zip() Operation. Then we need to convert the result of the zip function into a list.
We will then print the variable.

Below is the implementation of the above approach:

Python3

# Defining arr1
arr1 = [5, 4, 2, 5, 6, 1]
 
# Creating the second array which
# holds the index values of previous array
arr2 = [i for i in range(len(arr1))]
 
# converting the result into list
res = list(zip(arr1,arr2))
 
# printing the result
print(res)

Output

[(5, 0), (4, 1), (2, 2), (5, 3), (6, 4), (1, 5)]

Time Complexity – O(min(len(iterable_1), len(iterable_2)))
Auxiliary Space – O(n)

How to iterate through list of tuples in Python

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