input: Write a python function to analyze the sentiment of a text using the TextBlob library.
  assert analyze_sentiment('I love this product') == 'Positive sentiment'
  assert analyze_sentiment('I hate this product') == 'Negative sentiment'
  assert analyze_sentiment('This product is okay') == 'Neutral sentiment'
output: def analyze_sentiment(text):
      from textblob import TextBlob
  
      analysis = TextBlob(text)
      polarity = analysis.sentiment.polarity
  
      if polarity > 0:
          return 'Positive sentiment'
      elif polarity < 0:
          return 'Negative sentiment'
      else:
          return 'Neutral sentiment'