String in Python

Python String

In Python, Strings are arrays of bytes representing Unicode characters. However, Python does not have a character data type, a single character is simply a string with a length of 1. Square brackets can be used to access elements of the string. And they are immutable.

Creating a String

Strings in Python can be created using single quotes or double quotes or even triple quotes. Lets see by an example how we can do this.

code :

# Python Program for

# Creation of String

  

# Creating a String 

# with single Quotes

String1 = 'Welcome to the Code World'

print("String with the use of Single Quotes: ")

print(String1)

  

# Creating a String

# with double Quotes

String1 = "I'm a Coder"

print("\nString with the use of Double Quotes: ")

print(String1)

  

# Creating a String

# with triple Quotes

String1 = '''I'm a Coder and i will live i this world'''

print("\nString with the use of Triple Quotes: ")

print(String1)

  

# Creating String with triple

# Quotes allows multiple lines

String1 = '''Code

            For

            Jb'''

print("\nCreating a multiline String: ")

print(String1)







output :




String with the use of Single Quotes: Welcome to the Code World String with the use of Double Quotes: I'm a Coder String with the use of Triple Quotes: I'm a Coder and I will live in this world Creating a multiline String: Code For Job

Accessing characters in Python

In Python, individual characters of a String can be accessed by using the method of Indexing. Indexing allows negative address references to access characters from the back of the String, e.g. -1 refers to the last character, -2 refers to the second last character and so on.
While accessing an index out of the range will cause an IndexError. Only Integers are allowed to be passed as an index, float or other types will cause a TypeError.

code :

# Python Program to Access

# characters of String

  

String1 = "codedudle"

print("Initial String: ")

print(String1)

  

# Printing First character

print("\nFirst character of String is: ")

print(String1[0])

  

# Printing Last character

print("\nLast character of String is: ")

print(String1[-1])







output :




Initial String: codedudle First character of String is: c Last character of String is: e

String Slicing

To access a range of characters in the String, method of slicing is used. Slicing in a String is done by using a Slicing operator (colon).

code :

 # Python Program to

# demonstrate String slicing

  

# Creating a String

String1 = "codedudle"

print("Initial String: ") 

print(String1)

  

# Printing 3rd to 12th character

print("\nSlicing characters from 3-8: ")

print(String1[3:8])

  

# Printing characters between 

# 3rd and 2nd last character

print("\nSlicing characters between " +

    "3rd and 2nd last character: ")

print(String1[3:-2])







output :




Initial String:

codedudle Slicing characters from 3-12: edudle Slicing characters between 3rd and 2nd last character: edud

Deleting/Updating from a String

In Python, Updation or deletion of characters from a String is not allowed. This will cause an error because item assignment or item deletion from a String is not supported. Although deletion of entire String is possible with the use of a built-in del keyword. This is because Strings are immutable, hence elements of a String cannot be changed once it has been assigned. Only new strings can be reassigned to the same name.

Updation of a character:

code :

# Python Program to Update

# character of a String

  

String1 = "Hello, I'm a coder"

print("Initial String: ")

print(String1)

  

# Updating a character 

# of the String

String1[2] = 'p'

print("\nUpdating character at 2nd Index: ")

print(String1)







It will give an error as we have already seen that strings are immutable and updating a character is not available.




but the deletion of entire string is possible. But we will update the entire String.




Lets see how we can do this.




code :




# Python Program to Update

# entire String

  

String1 = "Hello, I'm a coder"

print("Initial String: ")

print(String1)

  

# Updating a String

String1 = "Welcome to the hello World"

print("\nUpdated String: ")

print(String1)







output :




Initial String: Hello, I'm a Geek Updated String: Welcome to the hello World







As we mentioned above that a String is immutable, so we cant delete the character from the string.




Lets see a example related to it.




# Python Program to Delete

# characters from a String

  

String1 = "Hello, I'm a coder"

print("Initial String: ")

print(String1)

  

# Deleting a character 

# of the String

del String1[2] 

print("\nDeleting character at 2nd Index: ")

print(String1)




But it will give a error




Deleting Entire String:

Deletion of entire string is possible with the use of del keyword. Further, if we try to print the string, this will produce an error because String is deleted and is unavailable to be printed.

We will see a code related to it . It will again give an error.

# Python Program to Delete

# entire String

  

String1 = "Hello, I'm a coder"

print("Initial String: ")

print(String1)

  

# Deleting a String

# with the use of del

del String1 




print("\nDeleting entire String: ")

print(String1)







Escape Sequencing in Python

While printing Strings with single and double quotes in it causes SyntaxError because String already contains Single and Double Quotes and hence cannot be printed with the use of either of these. Hence, to print such a String either Triple Quotes are used or Escape sequences are used to print such Strings.
Escape sequences start with a backslash and can be interpreted differently. If single quotes are used to represent a string, then all the single quotes present in the string must be escaped and same is done for Double Quotes.







# Python Program for # Escape Sequencing  # of String    # Initial String String1 = '''I'm a "coder"''' print("Initial String with use of Triple Quotes: ") print(String1)    # Escaping Single Quote  String1 = 'I\'m a "coder"' print("\nEscaping Single Quote: ") print(String1)    # Escaping Doule Quotes String1 = "I'm a \"coder\"" print("\nEscaping Double Quotes: ") print(String1)    # Printing Paths with the  # use of Escape Sequences String1 = "C:\\Python\\coder\\" print("\nEscaping Backslashes: ") print(String1)




output :




Initial String with use of Triple Quotes: I'm a "coder" Escaping Single Quote: I'm a "coder" Escaping Double Quotes: I'm a "coder" Escaping Backslashes: C:\Python\coder\







Formatting of Strings

Strings in Python can be formatted with the use of format() method which is very versatile and powerful tool for formatting of Strings. Format method in String contains curly braces {} as placeholders which can hold arguments according to position or keyword to specify the order.

Lets see a example

# Python Program for

# Formatting of Strings

  

# Default order

String1 = "{} {} {}".format('Code', 'For', 'Job')

print("Print String in default order: ")

print(String1)

  

# Positional Formatting

String1 = "{1} {0} {2}".format('Code', 'For', 'Job')

print("\nPrint String in Positional order: ")

print(String1)

  

# Keyword Formatting

String1 = "{j} {f} {c}".format(c = 'Code', f = 'For', j = 'Job')

print("\nPrint String in order of Keywords: ")

print(String1)




output :




Print String in default order: Code For Job Print String in Positional order: For Code Job Print String in order of Keywords: Code For Job




In this article i have given brief summary of String data type in Python




Next Article : Tuple in Python










Recommended Post : Introduction to Data types

Output formatting in Python






















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