new_contents: import math
  import numpy
  import pyaudio
  
  
  def sine(frequency, length, rate):
      length = int(length * rate)
      factor = float(frequency) * (math.pi * 2) / rate
      return numpy.sin(numpy.arange(length) * factor)
  
  
  def play_tone(stream, frequency=440, length=1, rate=44100):
      chunks = []
      chunks.append(sine(frequency, length, rate))
  
      chunk = numpy.concatenate(chunks) * 0.25
  
      stream.write(chunk.astype(numpy.float32).tostring())
  
  
  if __name__ == '__main__':
      p = pyaudio.PyAudio()
      stream = p.open(format=pyaudio.paFloat32,
                      channels=1, rate=44100, output=1)
  
      play_tone(stream, frequency=750, length=10)
  
      stream.close()
      p.terminate()
  
subject: Test codie to get sound duration right