How do you rotate a word in a string in python?

I was trying to make the string HELLO to OHELL in Python. But couldn't get any way to rotate it without working with loops. How to code for it in just 1-2 lines so that I could get the desired pattern?

asked Feb 4, 2018 at 10:55

2

Here is one way:

def rotate(strg, n):
    return strg[n:] + strg[:n]

rotate('HELLO', -1)  # 'OHELL'

Alternatively, collections.deque ("double-ended queue") is optimised for queue-related operations. It has a dedicated rotate() method:

from collections import deque

items = deque('HELLO')
items.rotate(1)

''.join(items)  # 'OHELL'

answered Feb 4, 2018 at 11:06

jppjpp

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1

You can slice and add strings:

>>> s = 'HELLO'
>>> s[-1] + s[:-1]
'OHELL'

This gives you the last character:

>>> s[-1]
'O'

and this everything but the last:

>>> s[:-1]
'HELL'

Finally, add them with +.

answered Feb 4, 2018 at 10:58

Mike MüllerMike Müller

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2

Here is what I use to rotate strings in Python3:

To rotate left by n:

def leftShift(text,n):
    return text[n:] + text[:n]

To rotate right by n:

def rightShift(text,n):
    return text[-n:] + text[:-n]

answered Mar 18, 2020 at 23:50

Clayton C.Clayton C.

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Here is a simple way of looking at it...

s = 'HELLO'
for r in range(5):
    print(s[r:] + s[:r])


HELLO
ELLOH
LLOHE
LOHEL
OHELL

answered Aug 30, 2019 at 14:28

KonchogKonchog

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I would agree with Mike Müller's answer:

s = 'HELLO'
s = s[-1] + s[:-1]

I would like to share another way of looking at s[:-1]

s[0:-1]

This means that it is starting from the start and including everything except for s[-1]. I hope this helped.

answered Mar 16, 2019 at 20:59

A string is given, our task is to slicing the string into two way. One is clockwise and another anticlockwise.

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).

Example

Input: string = "pythonprogram"
d = 2
Output: Left Rotation: thonprogrampy
Right Rotation: ampythonprogr

Algorithm

Step 1: Enter string.
Step 2: 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 : ].
Step 3: Now concatenate these two parts second + first accordingly.

Example Code

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 : ]
   print ("Left Rotation : ", (Lsecond + Lfirst) )
      print ("Right Rotation : ", (Rsecond + Rfirst) )
      # Driver program
   if __name__ == "__main__":
      str = input("Enter String ::>")
d=2
rotate(str,d)

Output

Enter String ::> pythonprogram
Left Rotation: thonprogrampy
Right Rotation: ampythonprogr

Updated on 23-Jun-2020 16:09:07

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