input: Write a python function to get the sentiment polarity of a given sentence using TextBlob.
  assert get_sentiment_polarity('I am so excited that I was chosen for the job.') == 0.8
  assert get_sentiment_polarity('This is a terrible mistake.') < 0
  assert get_sentiment_polarity('It is an average day.') == 0
output: from textblob import TextBlob
  
  def get_sentiment_polarity(sentence):
      blob = TextBlob(sentence)
      return blob.sentiment.polarity