String in Python

String in Python

• String is a collection of characters.
• It is created using single quotes or double quotes or triple quotes.

Creating String

#string with single quotes
str1='I love PyTHON'
#string with double quotes
str2="I love PyTHON"
#string with triple quotes
str3='''I love PyTHON'''

Accessing or Printing String

• We can print string using print() function.
• We can also print particular character of string using index number.
• String are stored in the form of array.

 

#creating string
str="PyTHON"
#printing string
print("String:",str)
#printing first character
print("First character:",str[0])
#printing second character
print("Second character:",str[1])
#printing last character
print("Last character:",str[-1])
"""
***Output***
String: PyTHON
First character: P
Second character: y
Last character: N
"""
 

Accessing particular character or range of characters from string.

• We can access range of characters from string using slicing operator colon(:).

#creating string
str="I love PyTHON"
#printing string
print("String:",str)
#printing indexing 2 to 6 character
print("str[2:6]:",str[2:6])
#printing character between
# 7th and 2nd last character
print("str[7:-1]:",str[7:-1])
"""
***Output***
String: I love PyTHON
str[2:6]: love
str[7:-1]: PyTHO
"""
 

Update String

• We can update string value by reassigning new value to the same variable.
• But we can,t update the particular character of the string.

#creating string
str="Python Programming"
print("Original String:",str)
#update string str
str="Java Programming"
print("Updated String:",str)
"""
***Output***
Original String: Python Programming
Updated String: Java Programming
""" 

• But we can,t update the particular character of the string.

#creating string
str="Python Programming"
print("Original String:",str)
#updating character P with M
#this line will raise an error
str[0]="M"
print("Updated String:",str)
"""
***Output***
TypeError: 'str' object does not support item assignment
"""

Multiline String

• We can create multiline string using three double quotes.

#creating string
str="""Hello friends.
you can learn python easily.
"""
#printing string
print("Multiline String:",str)
"""
***Output***
Multiline String: Hello friends.
you can learn python easily.
"""
 

• We can also create multiline string using three single quotes.

#creating string
str='''Hello friends.
you can learn python easily.
'''
#printing string
print("Multiline String:",str)
"""
***Output***
Multiline String: Hello friends.
you can learn python easily.
"""

Search String

• in keyword is used to check specified character or group of characters is present or not.
• in keyword returns true if specified character is present otherwise returns false.

#creating string
str="I love python programming"
search_str=input("Enter any string to search:")
if  search_str in str:
    print(search_str," is present")
else:
    print(search_str,"is not present")
"""
***Output***
Enter any string to search:python
python  is present
"""
 

• Check specified string is not present in the string.

 #creating string
str="I love python programming"
print("java" not in str)
print("python" not in str)
"""
***Output***
True
False
"""
 

String Concatenation

• We can combine two or more than two string using plus (+) operator.

#creating string
str1="I love "
str2="python programming"
str3=str1+str2
print("String1:",str1)
print("String2:",str2)
print("String3:",str3)
"""
***Output***
String1: I love 
String2: python programming
String3: I love python programming
"""
 

• We can't combine string with numeric value.

#creating string
book="xyz"
price=550
#this line will raise an error
str3="The price of book "+book+" is Rs."+price
print("Combined String:",str3)
"""
***Output***
 str3="The price of book "+book+" is Rs."+price
TypeError: can only concatenate str (not "int") to str
"""

• To combine string with numeric value format() function is used.

#creating string
book="xyz"
price=550
#combining string with numeric value
str3="The price of book {} is Rs. {}".format(book,price)
print("Combined String:",str3)
"""
***Output***
String: The price of book xyz is Rs. 550
"""

String repetition.

• asterisk (*) symbol is used to concate multiple copies of the same string.

str="Python ";
#print Python 5 times
print(str*5)
"""
***Output***
Python Python Python Python Python 
"""

Request:-If you found this post helpful then let me know by your comment and share it with your friend. 

If you want to ask a question or want to suggest then type your question or suggestion in comment box so that we could do something new for you all. 

If you have not subscribed my website then please subscribe my website. 

Try to learn something new and teach something new to other. Thanks.