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).


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.




# 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'



Left Rotation  : eksforGeeksGe 
Right Rotation : ksGeeksforGee

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