title: PyAudio.open, how to use?
body: <p>I'm trying to make a pyaudio input stream but can't figure out how to make it.
  What I did is:</p>
  
  <pre><code>a = pyaudio.PyAudio()
  </code></pre>
  
  <p>Then tried to call a.open() but I don't know the arguments I should type in. It asks me to check Stream.<strong>init</strong> for a reference, but I don't know what a PA_MANAGER is and the documentation isn't useful at all about it.</p>