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lines = ['', '', '', '', '']
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to_line = self._delta_item_to_line
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for delta_item in delta_to_new:
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'to_line generated non-str output %r' % lines[-1])
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lines[0] = "format: %s\n" % InventoryDeltaSerializer.FORMAT_1
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lines[1] = "parent: %s\n" % old_name