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> New try (I fixed my email address and the patch).
>
> The purpose of os.get_terminal_size() is the same as `stty size`, so 
> `stty size` could be a model for behavior of os.get_terminal_size().
I guess that this fallback will make some things easier. As long it is documented, the user should be able to get whatever behaviour they want.
I have four small questions:
- -1 is used as the argument meaning "try stdout and stdin". But -1 is 
 also used the error return value for open(2) and other system 
 functions. I know that Python checks the return value to throw an 
 exception, and -1 shouldn't "leak" and be passed by mistake to 
 os.get_terminal_size(). Can someone confirm that this is
 the case?
- Why stderr is not checked too? It would make os.get_terminal_size()
 return the real terminal value in a the middle of a pipe:
 cat | python -c 'import os; os.get_terminal_size()' | cat.
- some doc change is missing
- in the new version the line with ioctl(fd, TIOCGWINSZ, &w) repeats
 three times. It think it could be reduced to two without loss
 of readability.