On 01/30/2017 03:49 AM, Steve D'Aprano wrote:
This code contains a Time Of Check to Time Of Use bug:if os.path.exists(destination) raise ValueError('destination already exists') os.rename(oldname, destination) In the microsecond between checking for the existence of the destination and actually doing the rename, it is possible that another process may create the destination, resulting in data loss. Apart from keeping my fingers crossed, how should I fix this TOCTOU bug?
There is a rather extensive discussion of this problem (with no good cross-platform solution if I remember correctly):
https://mail.python.org/pipermail/python-ideas/2011-August/011131.html which is related to http://bugs.python.org/issue12741 Wolfgang -- https://mail.python.org/mailman/listinfo/python-list
