Python | Reverse Slicing of given string倒排并切割字符串

Sometimes, while working with strings we might have a problem in which we need to perform the reverse slicing of string, i.e slicing the string for certain characters from the rear end. Let’s discuss certain ways in which this can be done.

Method #1 : Using join() + reversed()
The combination of above function can be used to perform this particular task. In this, we reverse the string in memory and join the sliced no. of characters so as to return the string sliced from rear end.

# Python3 code to demonstrate working of

# Reverse Slicing string 

# Using join() + reversed()

  

# initializing string 

test_str = "GeeksforGeeks"

  

# printing original string 

print("The original string is : " + test_str)

  

# initializing K 

K = 7

  

# Using join() + reversed()

# Reverse Slicing string 

res = ''.join(reversed(test_str[0:K]))

  

# printing result 

print("The reversed sliced string is : " + res)

Output :

The original string is : GeeksforGeeks
The reversed sliced string is : ofskeeG

Method #2 : Using string slicing
The string slicing can be used to perform this particular task, by using “-1” as the third argument in slicing we can make function perform the slicing from rear end hence proving to be a simple solution.

# Python3 code to demonstrate working of

# Reverse Slicing string 

# Using string slicing

  

# initializing string 

test_str = "GeeksforGeeks"

  

# printing original string 

print("The original string is : " + test_str)

  

# initializing K 

K = 7

  

# Using string slicing

# Reverse Slicing string 

res = test_str[(K-1)::-1]

  

# printing result 

print("The reversed sliced string is : " + res)

Output :

The original string is : GeeksforGeeks
The reversed sliced string is : ofskeeG

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