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The ljust() string method is used to create a left justified version of the invoked string, padded with a specific character on its right side, which is by default a space character.

Note : None of the string methods change the original string and only return a new string which reflects the change performed by the string method, hence the returned string must be stored or used(if needed to reflect the result), otherwise it is lost.

• Signature of ljust() method




endswith(length, padding)





Parameters	Description
length	This is the length of the string returned by the method ljust(). A non-optional attribute.
padding	This value is used as a padding while left justifying the invoked string value. An optional attribute.








• Calling ljust() method on a string object.




# Python -  Program to left justify the content of a string using ljust() method




# Creating a first string 
s1 = 'BONJOUR'


# Creating a second string
s2 = 'à tous'



# Printing the first string
print('The value of first string : ',  s1)


# Printing the second string
print('The value of second string : ',  s2)



# Creating a third string by concatenating the left justified form of first string with the second string, using + operator
s3 = s1.ljust(15) + s2


# Printing the third string
print('The value of third  string : ', s3)





Output




The value of first string :  BONJOUR
The value of second string :  à tous
The value of third  string :  BONJOUR        à tous


The first string object was initialized to a value BONJOUR, while the second string was initialized to a value à tous. Next, we have created a third string by concatenating the left justified(padded with white spaces on its right side) form of first string with the second string, using + operator.






• Method ljust() does not modify the original characters in a string object


The method ljust() does not modify the original string, but, it only returns a transformed version of the invoked string which is left justified.


Let's show you this by an example -:
Here in program below, we have initialized a string object with a value Moon - The Natural Satellite of Earth and we are trying to modify its content and align it at the center by calling the ljust() method on it.



# Python -  Program to left justify the content of a string using ljust() method




# Creating a first string 
s1 = 'BONJOUR'


# Creating a second string
s2 = ' à tous'



# Printing the first string
print('The value of first string : ',  s1)


# Printing the second string
print('The value of second string : ',  s2)



# Calling  the ljust() method on string object to left justify its content
# And have its length to 30, which is padded with a default space character on its right.
print('The left justified value of first string : ', s1.ljust(30))




# Creating a third string by concatenating the first and the second string, using + operator
s3 = s1 + s2


# Printing the third string
print('Concatenation of first and second string : ', s3)





Output is :




The value of first string :  BONJOUR
The value of second string :   à tous
The left justified value of first string :  BONJOUR                       
Concatenation of first and second string :  BONJOUR à tous


This was a little different from out previous example, just to show you that just calling the method ljust() on a string object, does not modify its original content.






• Strings are immutable but reference variables are mutable.


String objects are immutable, but the reference variables pointing to them are not, therefore in order to display the impact of calling the ljust() method on the original object, we can make the reference variable to the original string, point to the result of calling the ljust() method(but in this case, the original string will be lost).



# Creating a first string 
s1 = 'BONJOUR'


# Creating a second string
s2 = ' à tous'



# Printing the first string
print('The value of first string : ',  s1)


# Printing the second string
print('The value of second string : ',  s2)



# Calling  the ljust() method on string object to left justify its content
# And have its length to 20, which is padded with a default space character on its right.
# The result of calling ljust() is assigned to the reference of original string.
s1 = s1.ljust(20)




# Creating a third string by concatenating the first and the second string, using + operator
s3 = s1 + s2


# Printing the third string
print('Concatenation of first and second string : ', s3)





Output is :




The value of first string :  BONJOUR
The value of second string :   à tous
Concatenation of first and second string :  BONJOUR              à tous






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• Padding the invoked string with a specific character.

While right justifying the content of the invoked string, we can pad its content with a specific character of our choice, which is by default, a space character. Let us see an example

# Python - ljust() method example.



# Creating a string
s = 'Smile each day and keep sadness away!'


# Printing the original string
print('Original string is : ', s)



# Calling  the ljust() method on string object
# which will return a left justified value of length 30, padded with a space on its right.
print(s.ljust(30))



# Calling  the ljust() method on string object
# which will return a left justified value of length 45, padded with # on its right.
print(s.ljust(45, '#'))



# Calling  the ljust() method on string object
# which will return a left justified value of length 40, padded with X on its right.
print(s.ljust(40, 'X'))



# Calling  the ljust() method on string object
# which will return a left justified value of length 60, padded with 0 on its right.
print(s.ljust(60, '0'))




# Calling  the ljust() method on string object
# which will return a left justified value of length 50, padded with @ on its right.
print(s.ljust(50, '@'))



# Calling  the ljust() method on string object
# which will return a left justified value of length 45, padded with @ on its right.
print(s.ljust(45, '.'))

Output is :

Original string is :  Smile each day and keep sadness away!
Smile each day and keep sadness away!
Smile each day and keep sadness away!########
Smile each day and keep sadness away!XXX
Smile each day and keep sadness away!00000000000000000000000
Smile each day and keep sadness away!@@@@@@@@@@@@@
Smile each day and keep sadness away!........

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< String rjust() Method

String replace() Method >

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