human
Solve the following python programming problem given the following code:
def _CompareBehaviors(self, method_name, path, real, fake, method_returns_path = False) : 
    'Invoke an os method in both real and fake contexts and compare results.

        Invoke a real filesystem method with a path to a real file and invoke a fake
        filesystem method with a path to a fake file and compare the results.    We
        expect some calls to throw Exceptions, so we catch those and compare them.

        Args:
            method_name: Name of method being tested, for use in error messages.
            path: potential path to a file in the real and fake file systems, passing
                an empty tuple indicates that no arguments to pass to method.
            real: built-in system library or method from the built-in system library
                which takes a path as an arg and returns some value.
            fake: fake_filsystem object or method from a fake_filesystem class
                which takes a path as an arg and returns some value.
            method_returns_path: True if the method returns a path, and thus we must
                compensate for expected difference between real and fake.

        Returns:
            A description of the difference in behavior, or None.
        ' 
    def _ErrorClass(e) : 
        return ((e and e.__class__.__name__) or 'None') 
real_value = None 
    fake_value = None 
    real_err = None 
    fake_err = None 
    method_call = ('%s' % method_name) 
    method_call += ('()' if (path == ()) else ('(%s)' % path)) 
    try : 
        args = ([] if (path == ()) else [path]) 
        real_method = real 
        if (not callable (real)) : 
            real_method = getattr (real, method_name) 
real_value = str (real_method (* args)) 
except Exception as e : 
        real_err = e 
try : 
        fake_method = fake 
        if (not callable (fake)) : 
            fake_method = getattr (fake, method_name) 
args = ([] if (path == ()) else [path]) 
        fake_value = str (fake_method (* args)) 
except Exception as e : 
        fake_err = e 
if...

    
    

    Fix the buggy line: return ('%s(%s): both raised %s, real errno %s, fake errno %s' % (method_name, fake_err, _ErrorClass (real_err), real_errno, fake_errno))
assistant
#Here is Python code to fix the buggy line: return ('%s(%s): both raised %s, real errno %s, fake errno %s' % (method_name, fake_err, _ErrorClass (real_err), real_errno, fake_errno))
.

return ('%s(%s): both raised %s, real errno %s, fake errno %s' % (method_name, path, _ErrorClass (real_err), real_errno, fake_errno))