Create script called getngrams.py.
Your script should define the following functions:
processSentence(sentence,posLex,negLex,tagger): The parameters of this function are a sentence (a string), a set positive words, a set of negative words, and a POS tagger. The function should return a list with all the 4-grams in the sentence that have the following structure:
not <any word <pos/neg word <noun.
For example: not a good idea
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getTop3(D): The only parameter of this function is a dictionary D. All the values in the dictionary are integers. The function returns a list of the keys with the 3 largest values in the dictionary.
Notes:
Don't change the names or the parameters of any of the functions
Make sure that your script imports all the libraries needed by the two functions
