title: Python: search for a file in current directory and all it's parents
body: <p>Is there an inbuilt module to search for a file in the current directory, as well as all the super-directories?</p>
  
  <p>Without the module, I'll have to list all the files in the current directory, search for the file in question, and recursively move up if the file isn't present. Is there an easier way to do this?</p>