Tuples datatype || Python for beginners

Tuples 

Definition 

• A tuple is an ordered sequence of any type of values and can be created as a set of comma separated values within parenthesis and indexed by integers.
• The difference between list and tuple is that tuples are immutable.

Syntax:

tuple=(element1, element2, element3)

Example:

tuple=(“Mari”,2017,9.5)

Tuple creation

• The tuple values are enclosed within parenthesis and separated with comma.
• The parenthesis is optional and we can create a tuple without them.
• To create a tuple with only one element, we have to include a comma at the end.

Syntax:

tuplename=()

tuplename=(element1, element2, element3)

tuplename=element1, element2, element3

tuplename=(1,)

Tuple accessing

Indexing and slicing can be used to access a tuple elements. The indices of tuple elements are numbered from 0 from left end and numbered from -1 from right end.

Example:

Tuple=(‘Mari’, 2017, 9.5)

Tuple[0]

Tuple[-1]

Tuple[0:1]

Output:

‘Mari’

9.5

‘Mari’

Tuple deletion

To delete a tuple and all the elements stored in it, use the keyword del.

Syntax

del tuplename

Example

tuple=(1,2,3,4,5)

del tuple

print(tuple)

Output

Error

Tuple updation

Tuple is immutable. We cannot alter its elements.

Example:

Tuple1=(1,2,3,4,5)

Tuple1[0]=6

Output:

Error

Tuple assignment 

Python has a feature that is the ability to have a tuple on the left hand side of an assignment statement. This allows you to assign more than one variable at a time when the left hand side is a sequence.

Example

Tuple1=(‘good’,’morning’)

x,y=Tuple1

print(x)

print(y)

x,y=y,x

print(y)

a,b=1,2,3

Output 

‘good’

‘morning’

‘good’

Error

Tuple as return value

Funtions can return tuples as return values. A function can only return one value but if the value is a tuple the effect is the same

Example1:

If you want to divide two integers and compute the quotient and remainder. It is better to compute them both at the same time. The built-in function divmod takes two arguments and returns a tuple of two values.

tuple1=divmod(7,3)

print(tuple1)

quotient,remainder=divmod(7,3)

print(quotient)

print(remainder)

Output

(2,1)

2

1