Here's my suggestion...

        def mode_megapixels(mode):
                return mode.width * mode.height

        # Sort by best refresh rate.
        modes.sort(key=lambda mode: -mode['refresh'])

        # Prefer to balance refresh rate vs. pixels.
        if dpi_known:
                acceptable = filter(lambda mode: mode.dpi >= 90, modes)
                if len(acceptable) > 0:
                        # Anything above 90 DPI is good enough
                        # for a default.
                        # Pick the one with the best refresh.
                        return acceptable[0]

        # DPI not known or too low, balance refresh vs. pixels.
        best_megapixels = max(modes, mode_megapixels)
        acceptable = filter(lambda mode: megapixels(mode) >=
                        best_megapixels / 2)
        # Pick the mode with the highest refresh rate and at least
        # half the max possible number of pixels.
        acceptable[0]

/abo


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