human
Solve the following python programming problem given the following code:
def _determine_default_helper(self, gcd = None, fallback = None, project_called = None) : 
    from gcloud._testing import _Monkey 
    from gcloud.datastore import client 
    _callers = [] 
    def gcd_mock() : 
        _callers.append ('gcd_mock') 
        return gcd 
def fallback_mock(project = None) : 
        _callers.append (('fallback_mock', project)) 
        return fallback 
patched_methods = { 
        '_get_gcd_project' : gcd_mock, 
        '_base_default_project' : fallback_mock, 
} 
    with _Monkey (client, ** patched_methods) : 
        returned_project = self._callFUT (project_called) 
return (_callers, _callers) 

    
    

    Fix the buggy line: return (_callers, _callers)
assistant
#Here is Python program to fix the buggy line: return (_callers, _callers)
.

return (returned_project, _callers)