Tuples in python better understanding with slides

Why do we need tuple in Python?
A tuple is also used to store multiple data of the
same type or different type.
2

What is a tuple in Python?
A tuple is a collection which is ordered and
unchangeable.
Tuple items are ordered, unchangeable, and allow
duplicate values
3

How tuple is different from list?
Tuples are immutable objects the lists are mutable.
This means that tuples cannot be changed while the
lists can be modified.
Tuples use parentheses (), whereas lists use square
brackets [].
4

Creating a tuple in Python?
Tuple is creating by placing all the items (elements)
inside a round bracket (), separated by commas.
To create a tuple with only one item, you have to add
a comma after the item, otherwise Python will not
recognize it as a tuple.
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Output: <class ‘tuple’>
Output: <class ‘string’>

To create a tuple with multiple item, you add comma
after every element except the last one.
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Tuple can also be created using a tuple constructor
‘tuple()’.
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Output: (‘apple’, ‘banana’, ‘cherry’)

Accessing item from a tuple?
You can access tuple items by referring to the index
number, inside square brackets same as we access
element from a list.
Example:
tuple1=("apple", "banana", "cherry", "orange", "kiwi")
print(tuple1[1:3])
Output: ('cherry', 'orange', 'kiwi')
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Output: banana

How to update a tuple?
Tuple is unchangeable but you can convert tuple into list,
change a list, and then convert list back into a tuple.
Example:
x = ("apple", "banana", "cherry")
y = list(x)
y[1] = "kiwi"
x = tuple(y)
print(x)
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Output: ("apple", “kiwi", "cherry")

How to add an item in a tuple?
1. Since tuples are immutable, they do not have a
build-in append() method, but you can convert it into a
list, add your item(s), and convert it back into a tuple.
Example:
thistuple = ("apple", "banana", "cherry")
y = list(thistuple)
y.append("orange")
thistuple = tuple(y)
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Output: ("apple", “banana", "cherry“,”orange”)

How to add an item in a tuple?
2. You are allowed to add tuples to tuples, so if you
want to add one item, (or many), create a new tuple
with the item(s), and add it to the existing tuple:
Example:
y = ("orange",)
thistuple += y
print(thistuple)
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Output: ("apple", “banana", "cherry“,”orange”)

How to remove an item in a tuple?
2. In the same way you add an element in a tuple, you
can remove an element from a tuple.
Example:
y = list(thistuple)
y.remove("apple")
thistuple = tuple(y)
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Output: (“banana", "cherry“)

How to unpack a tuple?
When we create a tuple, we normally assign values to it.
This is called "packing" a tuple. But, in Python, we are
also allowed to extract the values back into variables.
This is called "unpacking":
Example Unpacking:
fruits = ("apple", "banana", "cherry")
(green, yellow, red) = fruits
print(green)
print(yellow)
print(red)
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Output: Apple
Output: banana
Output: cherry

Using Asterisk (*): If the number of variables is less
than the number of values, you can add an * to the
variable name and the values will be assigned to the
variable as a list
Example Unpacking:
fruits = ("apple", "banana", "cherry“, “strawberry”)
print(green)
print(yellow)
print(red)
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Output: Apple
Output: banana
Output: [cherry, strawberry]

Using Asterisk (*): If the number of variables is less
than the number of values, you can add an * to the
variable name and the values will be assigned to the
variable as a list
Example Unpacking:
fruits = ("apple", "banana", "cherry“, “strawberry”)
print(green)
print(yellow)
print(red)
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Output: Apple
Output: banana
Output: [cherry, strawberry]

Basic tuple operations?
Tuples respond to the + and * operators much like
strings; they mean concatenation and repetition here
too, except that the result is a new tuple, not a string.
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Tuple methods?
Python has built-in methods that you can use on tuples.
count(): Returns the number of times a specified value
occurs in a tuple.
index(): Searches the tuple for a specified value and
returns the position of where it was found.
len(): Gives the total length of a tuple.
tuple(seq): Convert list into tuple.
cmp(tuple1,tuple2): Compares elements of both tuples.
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Learning Objective
In this lecture, we learnt what is a
tuple, why we need tuple, how to
create and write a tuple in Python and
which operations we can perform on
tuple.
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Conclusion
● To store multiple data in programming, tuple
is used.
● With the help of tuple methods we can
perform many operations on tuple
respectively.
● Built-In functions can also be used on tuple.
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Self Assessment
Solve the Following Programs
1. Write a program to print the first element of a
tuple.
2. Write a program to get a last element in a tuple
using negative indexing.
3. Write a program to use a range of indexes to print
the third, fourth, and fifth item in the tuple
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Self Assessment
Solve Following Programs
1. Write a program to print the numbers of a specified
tuple after removing even numbers from it.
2. Write a program to print a specified tuple after
remvoing the 0th, 4th
and 5th
elements.
Sample list=(”yellow”,”Pink”,”Red”,”Green”,”Blue”,”Purple”)
Output =(”Pink”,”Red”,”Green”)
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Tuples in python better understanding with slides

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