Tuple - Python

Tuple:

^v       A tuple is same as list, except that the set of elements is enclosed in parentheses instead of square brackets.

^v       A tuple is an immutable list. i.e. once a tuple has been created, you can't add elements to a tuple or remove elements from the tuple.

^v       But tuple can be converted into list and list can be converted in to tuple.

Benefit of Tuple:

^v       Tuples are faster than lists.

^v       If the user wants to protect the data from accidental changes, tuple can be used.

^v       Tuples can be used as keys in dictionaries, while lists can't.

Operations on Tuples:

1.              Indexing

2.              Slicing

3.              Concatenation

4.              Repetitions

5.              Membership

6.              Comparison

Tuple methods:

Tuple is immutable so changes cannot be done on the elements of a tuple once it is assigned.

Tuple Assignment:

^v       Tuple assignment allows, variables on the left of an assignment operator and values of tuple on the right of the assignment operator.

^v       Multiple assignment works by creating a tuple of expressions from the right hand side, and a tuple of targets from the left, and then matching each expression to a target.

^v       Because multiple assignments use tuples to work, it is often termed tuple assignment.

Uses of Tuple assignment:

^v       It is often useful to swap the values of two variables.

Example:

Swapping using temporary variable:

a=20

b=50

temp = a

a = b

b = temp

print("value after swapping is",a,b)

Swapping using tuple assignment:

a=20

b=50

(a,b)=(b,a)

print("value after swapping is",a,b)

Multiple assignments:

Multiple values can be assigned to multiple variables using tuple assignment.

>>>(a,b,c)=(1,2,3)

>>>print(a)

1

>>>print(b)

2

>>>print(c)

3

Tuple as return value:

^v       A Tuple is a comma separated sequence of items.

^v       It is created with or without ( ).

^v       A function can return one value. if you want to return more than one value from a function. we can use tuple as return value.

Example1:

def div(a,b):

r=a%b

q=a//b

return(r,q)

a=eval(input("enter a value:"))

b=eval(input("enter b value:"))

r,q=div(a,b)

print("reminder:",r)

print("quotient:",q)

Output:

enter a value:4

enter b value:3

reminder: 1

quotient: 1

Example2:

def min_max(a):

small=min(a)

big=max(a)

return(small,big)

a=[1,2,3,4,6]

small,big=min_max(a)

print("smallest:",small)

print("biggest:",big)

Output:

smallest: 1

biggest: 6

Tuple as argument:

The parameter name that begins with * gathers argument into a tuple.

Example:

def printall(*args):

print(args)

printall(2,3,'a')

Output:

(2, 3, 'a')