Find the first repeated word in a string in Python using Dictionary
Prerequisite : Dictionary data structure
Given a string, Find the 1st repeated word in a string.
Examples:
Input : "Ravi had been saying that he had been there" Output : had Input : "Ravi had been saying that" Output : No Repetition Input : "he had had he" Output : he
We have existing solution for this problem please refer Find the first repeated word in a string link. We can solve this problem quickly in python using Dictionary data structure. Approach is simple,
- First split given string separated by space.
- Now convert list of words into dictionary using collections.Counter(iterator) method. Dictionary contains words as key and it’s frequency as value.
- Now traverse list of words again and check which first word has frequency greater than 1.
# Function to Find the first repeated word in a string from collections import Counter def firstRepeat(input): # first split given string separated by space # into words words = input.split(' ') # now convert list of words into dictionary dict = Counter(words) # traverse list of words and check which first word # has frequency > 1 for key in words: if dict[key]>1: print (key) return # Driver program if __name__ == "__main__": input = 'Ravi had been saying that he had been there' firstRepeat(input) |
Output:
had
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