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Python | Reverse Incremental String Slicing

  • Last Updated : 22 Apr, 2020

Sometimes, while working with Pythonn strings, we can have a problem in which we need to perform the slice and print of strings in reverse order. This can have application in day-day programming. Lets discuss certain ways in which this task can be performed.

Method #1 : Using loop
This is brute force way in which this task can be performed. In this, we iterate the list in reverse order and store the incremental strings in list.




# Python3 code to demonstrate working of 
# Reverse Incremental String Slicing
# Using loop
  
# initializing string
test_str = "geeks"
  
# printing original string
print("The original string is : " + test_str)
  
# Reverse Incremental String Slicing
# Using loop
res = []
sub = ''
for chr in reversed(test_str):
    sub += chr
    res.append(sub)
  
# printing result 
print("The incremental reverse strings : " + str(res)) 
Output :
The original string is : geeks
The incremental reverse strings : ['s', 'sk', 'ske', 'skee', 'skeeg']

 

Method #2 : Using list slicing + list comprehension
This is yet another way in which this task can be performed. In this, we iterate the string list using list comprehension and slicing is used to perform incremental slicing.






# Python3 code to demonstrate working of 
# Reverse Incremental String Slicing
# Using list comprehension + list slicing
  
# initializing string
test_str = "geeks"
  
# printing original string
print("The original string is : " + test_str)
  
# Reverse Incremental String Slicing
# Using list comprehension + list slicing
res = [test_str[-1 : idx : -1] for idx in range(-2, -2 - len(test_str), -1)]
  
# printing result 
print("The incremental reverse strings : " + str(res)) 
Output :
The original string is : geeks
The incremental reverse strings : ['s', 'sk', 'ske', 'skee', 'skeeg']

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