Python – Edit objects inside tuple

Sometimes, while working with tuples, being immutable can offer a lot of confusion regarding its working. One of the questions that can pop into the mind is, Are objects inside tuples mutable? The answer to this is Yes. Let’s discuss certain ways in which this can be achieved. 

Method #1: Using Access methods

This is one of the ways in which edit inside objects of tuples can be performed. This occurs similarly to any other container and in place using list access method. 

Python3

# Python3 code to demonstrate working of
# Edit objects inside tuple
# Using Access Methods

# initializing tuple
test_tuple = (1, [5, 6, 4], 9, 10)

# printing original tuple
print("The original tuple : " + str(test_tuple))

# Edit objects inside tuple
# Using Access Methods
test_tuple[1][2] = 14

# printing result
print("The modified tuple : " + str(test_tuple))

Output : 

The original tuple : (1, [5, 6, 4], 9, 10)
The modified tuple : (1, [5, 6, 14], 9, 10)

Method #2 : Using pop() + index()

The combination of the above functionalities can also be used to solve this problem. In this, we perform the task of removal using pop() and add an element at a particular index using index(). 

Python3

# Python3 code to demonstrate working of
# Edit objects inside tuple
# Using pop() + index()

# initializing tuple
test_tuple = (1, [5, 6, 4], 9, 10)

# printing original tuple
print("The original tuple : " + str(test_tuple))

# Edit objects inside tuple
# Using pop() + index()
test_tuple[1].pop(2)
test_tuple[1].insert(2, 14)

# printing result
print("The modified tuple : " + str(test_tuple))

Output : 

The original tuple : (1, [5, 6, 4], 9, 10)
The modified tuple : (1, [5, 6, 14], 9, 10)

 Method #3 : Using the list

Approach

Convert the tuple to a list, edit the list, and convert it back to a tuple

Algorithm

1. Convert the tuple to a list using the list() function.
2. Edit the list by accessing the desired index and assigning a new value to it.
3. Convert the edited list back to a tuple using the tuple() function.

Python3

# Initial tuple
my_tuple = (1, 2, 3, 4, 5)

# Convert the tuple to a list
my_list = list(my_tuple)

# Edit the list
my_list[2] = 10

# Convert the list back to a tuple
my_tuple = tuple(my_list)

# Print the updated tuple
print(my_tuple)

Output

(1, 2, 10, 4, 5)

Time Complexity: O(n), where n is the length of the tuple.
Space Complexity: O(n), where n is the length of the tuple.

Method #4: Using lambda function

Define a lambda function to modify the given tuple by replacing the element at the specified index with a new value.
Call the lambda function with the original tuple, index of the element to be replaced, and the new value.

Algorithm

1. Define a lambda function modify_tuple that takes three arguments – the original tuple, the index of the element to be replaced, and the new value.
2. Use slicing to create a new tuple that has the same elements as the original tuple up to the specified index, followed by the new value, and then the remaining elements of the original tuple.
3. Return the new tuple.

Python3

# Using lambda function to modify the tuple
modify_tuple = lambda tup, index, new_val: tup[:index] + (new_val,) + tup[index+1:]

# Example usage
tup = (1, [5, 6, 4], 9, 10)
new_tup = modify_tuple(tup, 1, [5, 6, 14])
print(new_tup)

Output

(1, [5, 6, 14], 9, 10)

Time Complexity: O(1), since the lambda function performs a constant number of operations regardless of the size of the tuple.

Auxiliary Space: O(N), where N is the size of the original tuple. This is because a new tuple is created that contains the same number of elements as the original tuple.

Method #5: Using the slicing

Python3

# Initial tuple
my_tuple = (1, 2, 3, 4, 5)

# Convert the tuple to a list
my_list = list(my_tuple)

# Edit the list using slicing
my_list[2:3] = [10]

# Convert the list back to a tuple
my_tuple = tuple(my_list)

# Print the updated tuple
print(my_tuple)

Output

(1, 2, 10, 4, 5)

Time complexity: The time complexity of this approach is O(n), where n is the length of the tuple.
Auxiliary space: The auxiliary space complexity is O(n), where n is the length of the tuple, as we are converting the tuple to a list.

METHOD 6:By creating a new tuple

APPROACH:

The approach modifies an object inside a tuple by creating a new tuple with the desired modification. It uses indexing and concatenation to replace the specified element in the tuple. The modified tuple is then printed as the output.

ALGORITHM:

1.Initialize the original tuple.
2.Create a new tuple by concatenating the desired modified parts with the original elements.
3.Output the modified tuple.

Python3

# Given input
tpl = (1, [5, 6, 4], 9, 10)

# Create a new tuple with the modified object
modified_tpl = tpl[:1] + ([tpl[1][0], tpl[1][1], 14] + tpl[1][3:],) + tpl[2:]

# Output
print("The modified tuple:", modified_tpl)

Output

The modified tuple: (1, [5, 6, 14], 9, 10)

Time Complexity:
The time complexity of this approach is O(1) as it doesn’t involve any iterative operations or looping. It simply performs indexing and concatenation, which take constant time regardless of the tuple size.

Space Complexity:
The space complexity of this approach is O(N), where N is the size of the modified list. In this case, since the modification involves replacing a single element, the space complexity is effectively O(1) as the list size remains constant.