String slicing in Python to rotate a string

Given a string of size n, write functions to perform following operations on string.

  1. Left (Or anticlockwise) rotate the given string by d elements (where d <= n).
  2. Right (Or clockwise) rotate the given string by d elements (where d <= n).

Examples:

Input : s = "GeeksforGeeks"
        d = 2
Output : Left Rotation  : "eksforGeeksGe" 
         Right Rotation : "ksGeeksforGee"  


Input : s = "qwertyu" 
        d = 2
Output : Left rotation : "ertyuqw"
         Right rotation : "yuqwert"

We have existing solution for this problem please refer Left Rotation and Right Rotation of a String link. We will solve this problem quickly in python using String Slicing. Approach is very simple,

  1. Separate string in two parts first & second, for Left rotation Lfirst = str[0 : d] and Lsecond = str[d :]. For Right rotation Rfirst = str[0 : len(str)-d] and Rsecond = str[len(str)-d : ].
  2. Now concatenate these two parts second + first accordingly.
filter_none

edit
close

play_arrow

link
brightness_4
code

# Function to rotate string left and right by d length
  
def rotate(input,d):
  
    # slice string in two parts for left and right
    Lfirst = input[0 : d]
    Lsecond = input[d :]
    Rfirst = input[0 : len(input)-d]
    Rsecond = input[len(input)-d : ]
  
    # now concatenate two parts together
    print "Left Rotation : ", (Lsecond + Lfirst)
    print "Right Rotation : ", (Rsecond + Rfirst)
  
# Driver program
if __name__ == "__main__":
    input = 'GeeksforGeeks'
    d=2
    rotate(input,d)

chevron_right






                        filter_none








Output:


Left Rotation  : eksforGeeksGe 
Right Rotation : ksGeeksforGee





Don’t stop now and take your learning to the next level. Learn all the important concepts of Data Structures and Algorithms with the help of the most trusted course: DSA Self Paced. Become industry ready at a student-friendly price.



    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts:
Shashank Mishra
Check out this Author's contributed articles.
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on  the "Improve Article" button below.