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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 build(self, shutit):
 		"""Sets up the machine ready for building. 		"""

		shutit_pexpect_session = ShutItPexpectSession(shutit, 'target_child','/bin/bash')
		target_child = shutit_pexpect_session.pexpect_child
		shutit_pexpect_session.expect(shutit_global.shutit_global_object.base_prompt.strip(), timeout=10)
		self.setup_host_child(shutit)
		self.setup_target_child(shutit, target_child)
		return True