title: Python watchdog duplicate events
body: <p>I've created a modified watchdog example in order to monitor a file for .jpg photos that have been added to the specific directory in Windows. </p>
  
  <pre><code>import time
  from watchdog.observers import Observer
  from watchdog.events import FileSystemEventHandler
  
  paths = []
  
  xp_mode = 'off'
  
  class FileHandler(FileSystemEventHandler):
  
      def on_created(self, event):
          if xp_mode == 'on':
              if not event.is_directory and not 'thumbnail' in event.src_path:
                  print "Created: " + event.src_path
                  paths.append(event.src_path)
  
      def on_modified(self, event):
          if not event.is_directory and not 'thumbnail' in event.src_path:
              print "Modified: " + event.src_path
              paths.append(event.src_path)
  
  if __name__ == "__main__":
      path = 'C:\\'
      event_handler = FileHandler()
      observer = Observer()
      observer.schedule(event_handler, path, recursive=True)
      observer.start()
      try:
          while True:
              time.sleep(1)
      except KeyboardInterrupt:
          observe r.stop()
  
      observer.join()
  </code></pre>
  
  <p>One of the things that I have noticed that when a file is added, both on_created and on_modified is called! To combat this problem, I decided to only use the on_modified method. 
  However, I am starting to notice that this also causes multiple callbacks, but this time to the on_modified method! </p>
  
  <pre><code>Modified: C:\images\C121211-0008.jpg
  Modified: C:\images\C121211-0009.jpg
  Modified: C:\images\C121211-0009.jpg &lt;--- What?
  Modified: C:\images\C121211-0010.jpg
  Modified: C:\images\C121211-0011.jpg
  Modified: C:\images\C121211-0012.jpg
  Modified: C:\images\C121211-0013.jpg
  </code></pre>
  
  <p>I cannot figure out for the life of me why this is happening! It doesn't seem to be consistent either. If anyone could shed some light on this issue, it will be greatly appreciated.</p>
  
  <p>There was a similar post, but it was for Linux: <a href="https://stackoverflow.com/questions/21587415/python-watchdog-modified-and-created-duplicate-events">python watchdog modified and created duplicate events</a></p>