input: Write a python function to analyze the sentiment of a given sentence and map the sentiment score to a 0-5 scale.
  assert sentiment_analysis('I love this!') == 5
  assert sentiment_analysis('I hate this!') == 0
  assert sentiment_analysis('This is okay.') == 3
output: def sentiment_analysis(sentence):
      from textblob import TextBlob
  
      analysis = TextBlob(sentence)
      polarity = analysis.sentiment.polarity
  
      if polarity <= -0.6:
          return 0
      elif -0.6 < polarity <= -0.2:
          return 1
      elif -0.2 < polarity <= 0:
          return 2
      elif 0 < polarity <= 0.2:
          return 3
      elif 0.2 < polarity <= 0.6:
          return 4
      else:
          return 5