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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def set_default_shutit_pexpect_session(self, shutit_pexpect_session):
 		"""Sets the default pexpect child. 		@param shutit_pexpect_session: pexpect child to set as default 		"""

		assert isinstance(shutit_pexpect_session, ShutItPexpectSession), shutit_util.print_debug()
		self.current_shutit_pexpect_session = shutit_pexpect_session
		return True