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d k rt d | � � qn t j | d � } d } | j | � | j � d } t j | | � | r|| rlt j | | � q|t j | � n Wd | r�| j � n | r�t j | � n | r�t j j | � r�y t j | � Wq�q�Xn Xd S( s� Safely overwrite a file by creating a temporary file in the same
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