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> #8408 was proposing a new module, which seems a bit overkill
If a module seems overkill, then maybe add this useful function to os module. Don't leave it private to argparse module. Maybe something along these lines:
 >>> import os
 >>> print(os.get_terminal_size())
 (80, 25)
Why do I believe a module could be better? Because I'd also like some way to detect when the terminal size has changed (without probing it all the time).