code: def push(self, source_file, device_filename, timeout_ms=None):
      
      mtime = 0
      if isinstance(source_file, six.string_types):
        mtime = os.path.getmtime(source_file)
        source_file = open(source_file)
  
      self.filesync_service.send(
          source_file, device_filename, mtime=mtime,
          timeout=timeouts.PolledTimeout.from_millis(timeout_ms))
docs: Push source_file to file on device.
  
      Arguments:
        source_file: Either a filename or file-like object to push to the device.
          If a filename, will set the remote mtime to match the local mtime,
          otherwise will use the current time.
        device_filename: The filename on the device to write to.
        timeout_ms: Expected timeout for any part of the push.