input: Write a function to create a Text-to-Speech Python application that reads out a given sentence using the pyttsx3 library. The function should take a string input representing the sentence to be read and use the pyttsx3 library to speak the sentence.
  
  def text_to_speech(sentence):
      engine = pyttsx3.init()
      engine.say(sentence)
      engine.runAndWait()
  
  assert text_to_speech("Hello, this is a simple sentence")==None
output: def text_to_speech(sentence):
      engine = pyttsx3.init()
      engine.say(sentence)
      engine.runAndWait()