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Not sure if this is a bug, or just One of Those Things:
sys.exit(large_value) can wrap around if the value is too large, but this is O/S dependent.
linux (ubuntu 14.04)
 $ python
 Python 2.7.8 (default, Oct 20 2014, 15:05:29) 
 [GCC 4.9.1] on linux2
 Type "help", "copyright", "credits" or "license" for more information.
 --> import sys
 --> sys.exit(256)
 $ echo $?
 0
 $ python
 Python 2.7.8 (default, Oct 20 2014, 15:05:29) 
 [GCC 4.9.1] on linux2
 Type "help", "copyright", "credits" or "license" for more information.
 --> import sys
 --> sys.exit(257)
 $ echo $?
 1
M$ (Windows 7)
 > python
 Python 2.7... 
 --> import sys
 --> sys.exit(65535)
 > echo %errorlevel%
 65535
 > python
 Python 2.7...
 --> import sys
 --> sys.exit(100000)
 > echo %errorlevel%
 100000
Perhaps a minor doc update that talks about return codes and why they might not be exactly what was given to Python?