human
Solve the following python programming problem given the following code:
def _mock_assert_host_exists(self) : 
    "Sets it so that the host API always thinks that 'fake_host'
        exists.
        " 
    def fake_assert_host_exists(context, host_name, must_be_up = False) : 
        return 'fake_host' 
self.stubs.Set (self.host_api, '_assert_host_exists', self) 

    
    

    Fix the buggy line: self.stubs.Set (self.host_api, '_assert_host_exists', self)
assistant
#Here is Python code to fix the buggy line: self.

self.stubs.Set (self.host_api, '_assert_host_exists', def fake_assert_host_exists()