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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 assert_screenshot(self, filename, threshold=0, exclude_elements=[], force=False):
 """Assert that a screenshot of the element is the same as a screenshot on disk, within a given threshold. :param filename: the filename for the screenshot, which will be appended with ``.png`` :param threshold: percentage threshold for triggering a test failure (value between 0 and 1) :param exclude_elements: list of WebElements, PageElements or element locators as a tuple (locator_type, locator_value) that must be excluded from the assertion :param force: if True, the screenshot is compared even if visual testing is disabled by configuration """

        VisualTest(self.driver_wrapper, force).assert_screenshot(self.web_element, filename, self.__class__.__name__,
                                                                 threshold, exclude_elements)