Python – Adding Tuple to List and vice – versa

Sometimes, while working with Python containers, we can have a problem in which we need to perform addition of one container with another. This kind of problem can have occurrence in many data domains across Computer Science and Programming. Let’s discuss certain ways in which this task can be performed.

Method 1 : Using += operator [list + tuple]
This operator can be used to join a list with a tuple. Internally its working is similar to that of list.extend(), which can have any iterable as its argument, tuple in this case.

Python3

# Python3 code to demonstrate working of
# Adding Tuple to List and vice - versa
# Using += operator (list + tuple)

# initializing list
test_list = [5, 6, 7]

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

# initializing tuple
test_tup = (9, 10)

# Adding Tuple to List and vice - versa
# Using += operator (list + tuple)
test_list += test_tup

# printing result
print("The container after addition : " + str(test_list))

Output : 

The original list is : [5, 6, 7]
The container after addition : [5, 6, 7, 9, 10]

Time complexity: O(1) – The += operator takes constant time to add a tuple to a list.
Auxiliary space: O(1) – No additional space is used, as the original list and tuple are modified in place.

Method #2 : Using tuple(), data type conversion [tuple + list]
The following technique is used to add list to a tuple. The tuple has to converted to list and list has to be added, at last resultant is converted to tuple.

Python3

# Python3 code to demonstrate working of
# Adding Tuple to List and vice - versa
# Using tuple(), data type conversion [tuple + list]

# initializing list
test_list = [5, 6, 7]

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

# initializing tuple
test_tup = (9, 10)

# Adding Tuple to List and vice - versa
# Using tuple(), data type conversion [tuple + list]
res = tuple(list(test_tup) + test_list)

# printing result
print("The container after addition : " + str(res))

Output : 

The original list is : [5, 6, 7]
The container after addition : (9, 10, 5, 6, 7)

Time complexity: O(1) – the code has a constant runtime that is not dependent on the size of the input.
Auxiliary space: O(n) – the space complexity of the code is dependent on the size of the input list.

Method #3: Using tuple(),list() and extend() methods

Python3

# Python3 code to demonstrate working of
# Adding Tuple to List and vice - versa

# initializing list and tuple
test_list = [5, 6, 7]
test_tup = (9,10)

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

# Adding Tuple to List
test_list.extend(list(test_tup))
# printing result
print("The container after addition : " + str(test_list))

#*********************************************************

# initializing list and tuple
test_list = [1,2,3,4]
test_tup=(5,6)

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

#Adding list to tuple
test_tup=list(test_tup)
test_tup.extend(test_list)
test_tup=tuple(test_tup)
# printing result
print("The container after addition : " + str(test_tup))

Output

The original list is : [5, 6, 7]
The container after addition : [5, 6, 7, 9, 10]
The original tuple is : (5, 6)
The container after addition : (5, 6, 1, 2, 3, 4)

Time complexity: O(n), where n is the size of the tuple being added.
Auxiliary space: O(n), where n is the size of the tuple being added.