Slice Operator and Tuple Methods

M3-R5.1 · Chapter 5: Sequence Data Types · 7 min read

Slice Operator:

tuple-name [start: end ] #will give you elements between indices start to end-1.

>>>alpha=('q','w','e','r','t','y')

>>> alpha[1:-3]

('w', 'e')

>>> alpha[3:6]

('r', 't', 'y')

>>> alpha[-1:-5]

( )

>>> alpha[-5:-1]

('w', 'e', 'r', 't')

Comparison Operators:

Compare two tuples
It compares the each corresponding element must compare equal and two
Sequences must be of the same type.
For non-equal comparison as soon as it gets a result in terms of True/False,
from corresponding elements’ comparison. If Corresponding elements are
equal, it goes to the next element and so on, until it finds elements that differ.

Example:

>>> T1 = (9, 16, 7)

>>> T2 = (9, 16, 7)

>>> T3 = ('9','16','7')

>>> T1 = = T2

>>> T1==T3

>>> T4 = (9.0, 16.0, 7.0)

>>> T1==T4

>>> T1<T2

>>> T1<=T2

True

False

True

False

True

Membership: We can apply the ‘in’ and ‘not in’ operator on the items. This tells us whether they belong to the tuple.

>>> "a" in tuple("string")

False

>>> "a" not in tuple("string")

True

Tuple Methods: Consider a tuple: subject=("Hindi","English","Maths","Physics")

Function Name	Description	Example
len( )	Find the length of a tuple. Syntax: len (tuple-name)	>>>subject=("Hindi","English","Maths","Physics”) >>> len(subject) 4
max( )	Returns the largest value from a tuple. Syntax: max(tuple-name)	>>> max(subject) 'Physics'
Error: If the tuple contains values of different data types, then it will give an error because mixed data type comparison is not possible. >>> subject = (15, "English", "Maths", "Physics", 48.2) >>> max(subject) TypeError: '>' not supported between instances of 'str' and 'int'
index( )	Returns the index of the first element with the specified value. Syntax: tuple:name.index(element)	>>>subject=("Hindi","English","Maths","Physics") >>> subject.index("Maths") 2
count( )	Return the number of times the value appears. Syntax: tuplename.count(element)	>>> subject.count("English") 1

Delete a Tuple: The del statement is used to delete elements and objects but as you know that tuples are

Immutable, which also means that individual element of a tuple cannot be deleted

Example:

>> T=(2,4,6,8,10,12,14)

>>> del T[3]

TypeError: 'tuple' object doesn't support item deletion

But you can delete a complete tuple with del statement as:

Example:

>>> T=(2,4,6,8,10,12,14)

>>> del T

>>> T

NameError: name 'T' is not defined

Q: Python program to add a tuple to a list

myList = [9, 3, 1, 4] # Creating the List

print("Initially List : " + str(myList))

myTuple = (2, 6) # Creating Tuple

myList += myTuple # Adding the tuple to list

# Printing resultant List

print("List after Addition : " + str(myList))

Q: Create a tuple with single item 50

tup1= (50, )

print(tup1)

Unpack the tuple into 4 variables

tuple1 = (10, 20, 30, 40)

a, b, c, d = tuple1

print(a) print(b)

print(c) print(d)

Q: Access value 20 from the tuple

tup1 = ("Orange", [10, 20, 30], (5, 15, 25))

# tup1[0] = 'Orange'

# tup1[1] = [10, 20, 30]

# list1[1][1] = 20

print(tup[1][1])

Q: Swap two tuples in Python

tup1 = (11, 22)

tup2 = (99, 88)

tup1, tup2 = tup2, tup1

print(tup2)

print(tup1)

Q: Write a program to copy elements 44 and 55 from the following tuple into a new tuple.

tup1 = (11, 22, 33, 44, 55, 66)

tup2 = tup1[3:-1]

print(tup2)

Q: Write a program to modify the first item (22) of a list inside a following tuple to 222

tup1 = (11, [22, 33], 44, 55)

tup1[1][0] = 222

print(tup1)

Q: Write a program to access nested tuples element.

tup1 = ([7,4,3],”JAI”,(10,11,12))

print(tup1[0][0])

print(tup1[0][1])

print(tup1[0][2])

print(tup1[1][0])

print(tup1[1][1])

print(tup1[1][2])

print(tup1[2][0])

print(tup1[2][1])

print(tup1[2][2])

Q: Write a program to access nested tuples element.

tup1=(1,3,5,7,9,11,13)

print(tup1[:]) #copy the tuple

print(tup1[1:]) # copy all value at index 1 or more

print(tup1[:1]) # copy one value starting at first

print(tup1[2:4]) # copy value from index 2 to 4

Output: (1,3,5,7,9,11,13)

(3,5,7,9,11,13)

(1,)

(5,7)

Q: Write a program on tuples string element.

tup1 = (“Python”,”Tuples”,”are”,”Immutable”)

print(“Total length of Tuple:”,len(tup1))

print(“maximum element of tuple:”,max(tup1))

print(“Maximum element of tuple:”,min(tup1))

print(“No. of occurance of are”,tup1.count(“are”))

Q: Convert a tuple in to a string.

tup = (1, 2, 3)

str1 = str(tup)

print(string) # Output: "(1, 2, 3)"

Convert a list in to a tuple

lst = [1, 2, 3, 4, 5]

tup = tuple(lst)

print(tup) # Output: (1, 2, 3, 4, 5)

Q: Find the index of an element in a tuple

tup = (10, 20, 30, 40, 50)

index = tup.index(30)

print(index) # Output: 2

Q: Find the common elements between two tuples

tup1 = (1, 2, 3, 4)

tup2 = (3, 4, 5, 6)

common =tuple(i for i in tup1 if i in tup2)

print(common)

Q:Sort a tuple of integers

tup = (5, 3, 8, 1, 2)

sorted_tup = sorted(tup)

print(sorted_tup)

Q: Merge two tuples and remove duplicates.

tup1 = (1, 2, 3)

tup2 = (3, 4, 5)

result = set(tup1).union(tup2)

print(result) # Output: (1, 2, 3, 4, 5)

Q: Find the first and last elements of a tuple.

tup = (10, 20, 30, 40, 50)

first, last = tup[0], tup[-1]

print("First:", first)

print("Last:", last)

Q:Count the number of even and odd numbers in a tuple

tup = (1, 2, 3, 4, 5, 6, 7, 8, 9)

even = sum(1 for x in tup if x % 2 == 0)

odd = len(tup) - even

print("Even:", even)

print("Odd:", odd)

Q: Find the frequency of each element in a tuple.

tup = (1, 2, 2, 3, 2, 4, 2)

freq= {}

for i in tup:

freq[i] = freq.get(i, 0) + 1

print(freq)

Q: Find the difference between two tuples.

tup1 = (1, 2, 3, 4, 5)

tup2 = (3, 4, 5, 6)

diff = tuple(x for x in tup1 if x not in tup2)

print(diff)