docs: def process_query(self):
  		"""Q.process_query() -- processes the user query, 
  		by tokenizing and stemming words.
  		"""
  		self.query = wt(self.query)
  		self.processed_query = []
  		for word in self.query:
  			if word not in self.stop_words and word not in self.punctuation:
  				self.processed_query.append(self.stemmer.stem(word))