Python - Join Tuples

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Joining Tuples in Python

Joining tuples in Python refers to combining the elements of multiple tuples into a single tuple. This can be achieved using various methods, such as concatenation, list comprehension, or using built-in functions like extend() or sum().

Joining tuples does not modify the original tuples but creates a new tuple containing the combined elements.

Joining Tuples Using Concatenation ("+") Operator

The concatenation operator in Python, denoted by +, is used to join two sequences, such as strings, lists, or tuples, into a single sequence. When applied to tuples, the concatenation operator joins the elements of the two (or more) tuples to create a new tuple containing all the elements from both tuples.

We can join tuples using the concatenation operator by simply using the + symbol to concatenate them.

Example

In the following example, we are concatenating the elements of two tuples "T1" and "T2", creating a new tuple "joined_tuple" containing all the elements from both tuples −

# Two tuples to be joined
T1 = (10,20,30,40)
T2 = ('one', 'two', 'three', 'four')
# Joining the tuples
joined_tuple = T1 + T2

# Printing the joined tuple
print("Joined Tuple:", joined_tuple)

Following is the output of the above code −

Joined Tuple: (10, 20, 30, 40, 'one', 'two', 'three', 'four')

Joining Tuples Using List Comprehension

List comprehension is a concise way to create lists in Python. It is used to generate new lists by applying an expression to each item in an existing iterable, such as a list, tuple, or range. The syntax for list comprehension is −

new_list = [expression for item in iterable]

This creates a new list where expression is evaluated for each item in the iterable.

We can join a tuple using list comprehension by iterating over multiple tuples and appending their elements to a new tuple.

Example

In this example, we are joining two tuples, T1 and T2, into a single tuple using list comprehension. The resulting tuple, joined_tuple, contains all elements from both T1 and T2 −

# Two tuples to be joined
T1 = (36, 24, 3)
T2 = (84, 5, 81)
# Joining the tuples using list comprehension
joined_tuple = [item for subtuple in [T1, T2] for item in subtuple]
# Printing the joined tuple
print("Joined Tuple:", joined_tuple)

Output of the above code is as follows −

Joined Tuple: [36, 24, 3, 84, 5, 81]

Joining Tuples Using extend() Function

The Python extend() function is used to append elements from an iterable (such as another list) to the end of the list. This function modifies the original list in place, adding the elements of the iterable to the end of the list.

The extend() function is not used for joining tuples in Python. It is used to extend a list by appending elements from another iterable (such as another list), effectively merging the two lists together.

We can join tuples using the extend() function by temporarily converting the tuples into lists, performing the joining operation as if they were lists, and then converting the resulting list back into a tuple.

Example

In the following example, we are extending the first tuple "T1" by converting it into a list "L1", then adding elements from the second tuple "T2" by first converting it into a list "L2", and finally converting the merged list back into a tuple, effectively joining the two tuples −

T1 = (10,20,30,40)
T2 = ('one', 'two', 'three', 'four')
L1 = list(T1)
L2 = list(T2)
L1.extend(L2)
T1 = tuple(L1)
print ("Joined Tuple:", T1)

The output obtained is as shown below −

Joined Tuple: (10, 20, 30, 40, 'one', 'two', 'three', 'four')

Join Tuples using sum() Function

In Python, the sum() function is used to add up all the elements in an iterable, such as a list, tuple, or set. It takes an iterable as its argument and returns the sum of all the elements in that iterable.

We can join a tuple using the sum() function by providing the tuple as an argument to the sum() function. However, since the sum() function is specifically designed for numeric data types, this method only works for tuples containing numeric elements. It will add up all the numeric elements in the tuple and return their sum.

Syntax

Following is the syntax for using the sum() function to join tuples in Python −

result_tuple = sum((tuple1, tuple2), ())

Here, the first argument is a tuple containing the tuples to be joined. The second argument is the starting value for the sum. Since we are joining tuples, we use an empty tuple () as the starting value.

Example

In this example, the elements of the first tuple are first appended to an empty tuple. Then elements from the second tuple are appended, resulting in a new tuple that is a concatenation of the two −

T1 = (10,20,30,40)
T2 = ('one', 'two', 'three', 'four')
T3 = sum((T1, T2), ())
print ("Joined Tuple:", T3)

After executing the above code, we get the following output −

Joined Tuple: (10, 20, 30, 40, 'one', 'two', 'three', 'four')

Joining Tuples using for Loop

A for loop in Python is used for iterating over a sequence (such as a list, tuple, string, or range) and executing a block of code for each element in the sequence. The loop continues until all elements have been processed.

We can join a tuple using a for loop by iterating over the elements of one tuple and appending each element to another tuple with the "+=" operator.

Example

In the following example, we are iterating over each element in tuple T2, and for each element, we are appending it to tuple T1, effectively joining the two tuples −

T1 = (10,20,30,40)
T2 = ('one', 'two', 'three', 'four')
for t in T2:
   T1+=(t,)
print (T1)

We get the output as shown below −

(10, 20, 30, 40, 'one', 'two', 'three', 'four')