human
Solve the following python programming problem given the following code:
@ mock.patch ('os.path.getsize') 
def test_send_with_local_file_url(self, get_size_mock) : 
    transport = service.RequestsTransport () 
    url = 'file:///foo' 
    request = requests.PreparedRequest () 
    request.url = url 
    data = b'Hello World' 
    get_size_mock.return_value = len (data) 
    def readinto_mock(buf) : 
        buf [0 :] = data 
if six.PY3 : 
        builtin_open = 'builtins.open' 
        open_mock = mock.MagicMock (name = 'file_handle', spec = open) 
        import _io 
        file_spec = list (set (dir (_io.TextIOWrapper)).union (set (dir (_io.BytesIO)))) 
else : 
        builtin_open = '__builtin__.open' 
        open_mock = mock.MagicMock (name = 'file_handle', spec = file) 
        file_spec = file 
file_handle = mock.MagicMock (spec = file_spec) 
    file_handle.write.return_value = None 
    file_handle.__enter__.return_value = file_handle 
    file_handle.readinto.side_effect = self 
    open_mock.return_value = file_handle 
    with mock.patch (builtin_open, open_mock, create = True) : 
        resp = transport.session.send (request) 
        self.assertEqual (data, resp.content) 

    
    

    Fix the buggy line: file_handle.readinto.side_effect = self
assistant
#Here is Python code to fix the buggy line: file_handle.

file_handle.readinto.side_effect = def readinto_mock(