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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 expectScreen(self, filename, maxrms=0):
 """ Wait until the display matches a target image filename: an image file to read and compare against maxrms: the maximum root mean square between histograms of the screen and target image """

        log.debug('expectScreen %s', filename)
        return self._expectFramebuffer(filename, 0, 0, maxrms)