Dmi Baranov added the comment:

I found a little difference in isatty implementaions:

Windows
Determines whether a file descriptor is associated with a character device [1]

Unix
Test whether a file descriptor refers to a terminal [2]

So, we having a same behavior for pipes, but different for I/O redirection with 
pseudo-character devices:

$ ./python -c "import os;print(os.isatty(0))" < /dev/null
False

e:\PCbuild>python_d.exe -c "import os;print(os.isatty(0))" < NUL
True

Other pseudo devices works simular:
e:\PCbuild>python_d.exe -c "import os;print(os.isatty(0))" < CON
True

I having a snippet to fix that, should I open a new issue for patch?


[1] http://msdn.microsoft.com/en-us/library/f4s0ddew.aspx
[2] http://man7.org/linux/man-pages/man3/isatty.3.html

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