Python – Sort on basis of reverse Strings

Given a String list, sort list on basis of reverse of strings.

Input : test_list = [“gfg”, “is”, “best”, “geeks”]
Output : [‘gfg’, ‘is’, ‘geeks’, ‘best’]
Explanation : g < is < ks < t [elements from rear], hence the order.

Input : test_list = [“gfg”, “is”, “best”]
Output : [‘gfg’, ‘is’, ‘best’]
Explanation : g < s < t [elements from rear], hence the order.

Method #1 : Using sort() + reverse()

 This is one of the ways in which this task can be performed. In this, we first reverse each element, perform sort and then again reverse each  string to get resultant ordering.



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# Python3 code to demonstrate working of 
# Sort on basis of reverse Strings
# Using reverse() + sort()
  
# initializing list
test_list = ["gfg", "is", "best", "for", "geeks"]
  
# printing original list
print("The original list : " + str(test_list))
  
# reverse() to reverse each string 
res = []
for ele in test_list:
    res.append("".join(reversed(ele))) 
      
# sorting to get required ordering 
res.sort()
  
# reverse each element again
test_list = []
for ele in res:
    test_list.append("".join(reversed(ele))) 
      
# printing result 
print("List after sorting on reversed strings : " + str(test_list))

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Output

The original list : ['gfg', 'is', 'best', 'for', 'geeks']
List after sorting on reversed strings : ['gfg', 'for', 'is', 'geeks', 'best']

Method #2 : Using list slicing  + sort()

This is yet another way in which this task can be performed. in this list slicing is used to perform reverse operation and sort() is used to sort, in one liner.

Python3

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# Python3 code to demonstrate working of 
# Sort on basis of reverse Strings
# Using list slicing + sort()
  
# initializing list
test_list = ["gfg", "is", "best", "for", "geeks"]
  
# printing original list
print("The original list : " + str(test_list))
  
# [::-1] to reverse each string 
# sort() to sort
test_list.sort(key = lambda sub: sub[::-1])
  
# printing result 
print("List after sorting on reversed strings : " + str(test_list))

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Output

The original list : ['gfg', 'is', 'best', 'for', 'geeks']
List after sorting on reversed strings : ['gfg', 'for', 'is', 'geeks', 'best']



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