25 - operations on Tuples

Manipulating Tuples

Tuples are immutable, hence if you want to add, remove or change tuple items, then first you must convert the tuple to a list. Then perform operation on that list and convert it back to tuple.

Example:

countries = ("Spain", "Italy", "India", "England", "Germany")
temp = list(countries)      # See DAY#9 - Type Casting
temp.append("Russia")       #add item
temp.pop(3)                 #remove item
temp[2] = "Finland"         #change item
countries = tuple(temp)
print(countries)

Output:

('Spain', 'Italy', 'Finland', 'Germany', 'Russia')

Thus, we convert the tuple to a list, manipulate items of the list using list methods, then convert list back to a tuple.

  • we can directly concatenate two tuples without converting them to list.

Example:

countries = ("Pakistan", "Afghanistan", "Bangladesh", "ShriLanka")
countries2 = ("Vietnam", "India", "China")
southEastAsia = countries + countries2
print(southEastAsia)

Output:

('Pakistan', 'Afghanistan', 'Bangladesh', 'ShriLanka', 'Vietnam', 'India', 'China')

Tuple methods

As tuple is immutable type of collection of elements, it has limited built in methods.

count() Method

The count() method of Tuple returns the number of times the given element appears in the tuple.

Syntax:

tuple.count(element)

Example

Tuple1 = (0, 1, 2, 3, 2, 3, 1, 3, 2)
res = Tuple1.count(3)
print('Count of 3 in Tuple1 is:', res)

Output

3

index() method

The Index() method returns the first occurrence of the given element from the tuple.

Syntax:

tuple.index(element)

tuple.index(element, start, end)
Note

This method raises a ValueError if the element is not found in the tuple.

Example

Tuple = (0, 1, 2, 3, 2, 3, 1, 3, 2)
res = Tuple.index(3)
res1 = Tuple.index(3)
print('First occurrence of 3 is', res)

Output

3

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