Fix DPI list assertion
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@ -182,7 +182,7 @@ def _feature_adjustable_dpi_choices(device):
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else:
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dpi_list.append(val)
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if step:
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assert dpi_list == 2, 'Invalid DPI list range: %r' % dpi_list
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assert len(dpi_list) == 2, 'Invalid DPI list range: %r' % dpi_list
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dpi_list = range(dpi_list[0], dpi_list[1] + 1, step)
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return _NamedInts.list(dpi_list)
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