EXPERIMENT - 3
Name :Chaaitanya Deshmukg Roll No : 60
Subject : Python Programming ( PP ) Class / Batch :B3
Date of Performance : Date of Submission :
Aim
Write a python program to create , concatenate and print a string and accessing sub
– string from a given string .
Theory
In Python , a string is a sequence of characters enclosed within either single quotes
( ' ) , double quotes ( " ) , or triple quotes ( ' ' ' or " " " ) . It's an immutable data type ,
meaning once created , its value cannot be changed .
Creating Strings --
# Single quotes
string1 = ' Hello , World ! '
# Double quotes
string2 = " Python is fun "
# Triple quotes for multiline strings
string3 = " " " This is a multiline string " " "
Accessing Characters -- You can access individual characters using indexing ( starts from 0 ) :
string = " Python "
print ( string[0] ) # Output : P
print ( string[2] ) # Output : t
print ( string[-1] ) # Output : n
Slicing Strings -- You can extract a substring using slicing :
print ( string[2:5] ) # Output : thon
String Concatenation -- Combining strings
greeting = " Hello "
name = " Alice "
message = greeting + " , " + name + " ! "
print ( message ) # Output : Hello , Alice !
String Length -- Finding the length of a string :
length = len ( string )
print ( length ) # Output : 6
String Methods -- Python offers numerous built – in methods for string manipulation :
text = " This is a sample string "
# Uppercase
print ( text.upper() ) # Output : THIS IS A SAMPLE STRING
# Lowercase
print ( text.lower() ) # Output : this is a sample string
# Strip leading and trailing whitespace
print( text.strip() ) # Output : This is a sample string
# Replace a substring
print ( text.replace ( " sample " , " example " ) ) # Output : This is an example string
# Find the index of a substring
print ( text.find ( " is " ) ) # Output : 3
# Check if a string starts with a specific substring
print ( text.startswith ( " This " ) ) # Output : True
# Check if a string ends with a specific substring
Print ( text.endswith ( " string " ) ) # Output : True
# Split a string into a list
words = text.split()
print ( words ) # Output : [ ' This ' , ' is ' , ' a ' , ' sample ' , ' string ' ]
TYPES OF STRINGS -
Python primarily has one primary string type : str . This represents
text data and is the most commonly used string type .
How Strings are Created
While there's only one primary type , there are different ways to
create strings :
1. Single Quotes :
string1 = ' This is a string '
2. Double Quotes :
string2 = " This is also a string "
3. Triple Quotes : Used for multi – line strings :
multiline_string = " " " This is a multiline string " " "
Key Points to Remember :
Immutability : Strings are immutable , meaning their content
cannot be changed after creation .
Indexing and Slicing : You can access individual characters or
substrings using indexing and slicing .
String Methods : Python provides a rich set of methods for
string manipulation ( e.g., upper() , lower() , strip() , split() , etc. )
.
String Formatting : You can format strings using f - strings or
the format() method .
1)Code_1
Input:
Output:
2)Code_2
Input:
Output:
