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Python | Remove all duplicates words from a given sentence
  • Last Updated : 19 Feb, 2021

Given a sentence containing n words/strings. Remove all duplicates words/strings which are similar to each others.


Input : Geeks for Geeks
Output : Geeks for

Input : Python is great and Java is also great
Output : is also Java Python and great

We can solve this problem quickly using python Counter() method. Approach is very simple.

1) Split input sentence separated by space into words.
2) So to get all those strings together first we will join each string in given list of strings.
3) Now create a dictionary using Counter method having strings as keys and their frequencies as values.
4) Join each words are unique to form single string.

from collections import Counter
def remov_duplicates(input):
    # split input string separated by space
    input = input.split(" ")
    # joins two adjacent elements in iterable way
    for i in range(0, len(input)):
        input[i] = "".join(input[i])
    # now create dictionary using counter method
    # which will have strings as key and their 
    # frequencies as value
    UniqW = Counter(input)
    # joins two adjacent elements in iterable way
    s = " ".join(UniqW.keys())
    print (s)
# Driver program
if __name__ == "__main__":
    input = 'Python is great and Java is also great'


is also Java Python and great

Alternative Method:-

# Program without using any external library
s = "Python is great and Java is also great"
l = s.split()
k = []
for i in l:
    # If condition is used to store unique string 
    # in another list 'k' 
    if (s.count(i)>1 and (i not in k)or s.count(i)==1):
print(' '.join(k))
Python is great and java also

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