## Tuples in Python

Tuples in Python are ordered collection of items(integer, float, string) which are immutable. The only difference from list you can notice that a tuple in Python is immutable.

Further, it uses parenthesis to create a tuple. However, tuples can also be created without parenthesis separated by comma.

Now open terminal or jupyter notebook.

Create a tuple t having 6 elements.

## Creating a Tuple

There are three ways to create a tuple

The first one using parenthesis

>>>t=(1,2,3,4,5,6)

The second one using tuple() constructor function.

>>>t=tuple([1,2,3,4,5,6])

The third one is to create a tuple without parenthesis from first method.

i.e.

>>>t=1,2,3,4,5,6

Note: Comma is mandatory

Among three the first one is popular.

## Accessing Elements From a Tuple

To Access elements from a tuple indexing is used.

Access the first element from t

>>>t[0]
Output:1

Access the second element t

>>>t[1]
Output:2

and so on.

## Changing a Value of Tuple

>>>t[1]=7

It will will raise an error.

## Accessing Elements From a Tuple Using Negative Indices

You can access the last element using -1 index.

i.e.

>>>t[-1]
Output:6

You can access the second last element using -2 index.

i.e.

>>>t[-2]
Output:5

## index() and count() Functions for a Tuple

index() function returns the index of an element of first occurrence.

If

>>>t=(1,2,3,4,5,6,7,6)

See an example

>>>t.index(6)

Output:5

count() function returns numbers of occurrences of an element.

See an example

>>>t.index(6)

Output: 2

## Changing a Tuple to a List

list() constructor function is used to convert a tuple to a list.

l= list(t)

Again you can convert list l into tuple using tuple() constructor.

t=tuple(l)

## Concatenating Two Tuples

Using + sign two tuples can be created.

Suppose you create a tuple t1=(1,2,3,4,5,6)

and another tuple t=(7,8,9,10)

Then

>>>=t3=t1+t2

>>>print(t3)

Output:(1,2,3,4,5,6,7,8,9,10)

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