[issue13609] Add "os.get_terminal_size()" function

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

The point of named tuples here is that you can use both
    get_terminal_size().columns
or
    columns, rows = get_terminal_size()
depending on the situation.
Also, the better repr() makes debugging easier.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13609>
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