<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def drop(self, format_p, action):
 """Informs the source that a drop event occurred for a pending drag and drop operation. in format_p of type str The mime type the data must be in. in action of type :class:`DnDAction` The action to use. return progress of type :class:`IProgress` Progress object to track the operation completion. raises :class:`VBoxErrorVmError` VMM device is not available. """

        if not isinstance(format_p, basestring):
            raise TypeError("format_p can only be an instance of type basestring")
        if not isinstance(action, DnDAction):
            raise TypeError("action can only be an instance of type DnDAction")
        progress = self._call("drop",
                     in_p=[format_p, action])
        progress = IProgress(progress)
        return progress