title: What exactly does invalid literal for int() with base 10 mean?
body: <p>I am writing a movie sentiment analysis and in the code I am getting one error and that is: invalid literal for int() with base 10. The code reads a separate text file containg movie reviews with its score. ex) 4 This movie was great. Thanks for the help! Edit: the error appears here: line 38 score = int(lineSplits[0].strip())</p>
  
  <pre><code>import re
  class WordStatistic:
      def __init__(self, keyword, averageScore = 0, occurences = 0):
          self.keyword = keyword
          self.averageScore = averageScore
          self.occurences = occurences
  
      def getWord(self) :
          return self.keyword
  
      def getAverageScore(self) :
          return self.averageScore
  
      def getOccurences(self) :
          return self.occurences
  
      def addNewScore(self, newScore) :
          oldScoreSum = self.averageScore * self.occurences
          self.occurences = self.occurences + 1
          self.averageScore = (oldScoreSum + newScore) / (self.occurences)
  
      def printWordStatistic(self) :
             print ("Word          : ", self.keyword)
             print ("Occurences    : ", self.occurences)
             print ("Average Score : ", self.occurences, "\n\n")
  # "teaching" the code
  wordDictionary = {}
  fileInstance = open("movieReviews.txt",'r')
  fileText = fileInstance.read()
  
  # formatting and splitting 
  reviewSplits = fileText.split("movieReviews")
  for review in reviewSplits :
          review = review.strip()
          if review == "" :
              continue
          lineSplits = review.split("\n")
          score = int(lineSplits[0].strip())
          for i in range(1, len(lineSplits)) :
              wordSplits = re.split("\t| ", lineSplits[i])
              for word in wordSplits :
                  if word == "" :
                      continue
                  # If it is already present, then update the score and count
                  # Otherwise just add the new entry to the dictionary
                  if wordDictionary in(word) :
                      wordStatistic = wordDictionary.get(word)
                      wordStatistic.addNewScore(score)
                  else :
                      wordStatistic = WordStatistic(word, score, 1)
                      wordDictionary[word] = wordStatistic
  # print the stats of the words
  def printAllWordStatistic(wordDictionary) :
      for wordStatistic in wordDictionary.values() :
          wordStatistic.printWordStatistic()
  # rating the actual review
  def calculateAverageOfReview(review) :
      review.replace("\t", " ")
      review.replace("\n", " ")
      wordSplits = review.split(" ")
      averageScore = 0.0
      totalCount = 0;
      for word in wordSplits :
          if wordDictionary in (word) :
              averageScore += wordDictionary.get(word).getAverageScore()
              totalCount = totalCount + 1
      if totalCount != 0 :
          return averageScore / totalCount
      return -1
  # getting user input and append multi lines of case of multi line review
  while (True) :
      print ("\nEnter a review : ");
      multiLines = []
      while True:
          line = input()
          if line:
              multiLines.append(line)
          else:
              break
      inputReview = '\n'.join(multiLines)
      averageScore = calculateAverageOfReview(inputReview)
      if averageScore != -1 :
          if averageScore &gt;= 2.50 :
              print ("Positive Review");
          else :
              print ("Negative Review");
      else :
          print ("Unable to rate the review");
      if input("\nDo you want to continue ? (Y/N) : ") != "Y" :
          print ("Quitting the session.");
          exit()
  </code></pre>