os.rename on Windows

[sjmsoft at gmail.com]

Python 2.7.11 on Windows 7 Enterprise (64-bit machine, 32-bit Python) and two Windows Server 2012 R2 (64-bit machines, both 32-bit and 64-bit Pythons):

183
17
WindowsError(183, 'Cannot create a file when that file already exists')

HTH,
  Steve