title: Returning value from thread in python without blocking main thread
body: <p>I have got an XMLRPC server and client runs some functions on server and gets returned value. If the function executes quickly then everything is fine but I have got a function that reads from file and returns some value to user. Reading takes about minute(there is some complicated stuff) and when one client runs this function on the server then server is not able to respond for other users until the function is done.</p>
  
  <p>I would like to create new thread that will read this file and return value for user. Is it possible somehow?</p>
  
  <p>Are there any good solutions/patters to do not block server when one client run some long function?</p>