title: Python: one single module (file .py) for each class?
body: <p>I've started programming in python 2 weeks ago. I'm making a separate file (module) for each class as I've done before in languages like Java or C#.
  But now, seeing tutorials and code from other people, I've realized that many people use the same files to define more than 1 class and the main function but I don't know if they do it like that because are just examples or because it's a python convention or something like that (to define and group many classes in the same files).</p>
  
  <p>So, in Python, one file for each class or many classes in the same files if they can be grouped by any particular feature? (like motor vehicles by one side and just vehicles by the other side).</p>
  
  <p>It's obvious that each one has his own style, but when I ask, I hope general answers or just the conventions, anyway, if someone wants to tell me his opinion about his own style and why, feel free to do it! ;)</p>