<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def destroy(self):
 		"""Finish up a session. 		"""

		if self.session_type == 'bash':
			# TODO: does this work/handle already being logged out/logged in deep OK?
			self.logout()
		elif self.session_type == 'vagrant':
			# TODO: does this work/handle already being logged out/logged in deep OK?
			self.logout()