def get_terminal_size(fallback=(80, 24)):
    """Get the size of the terminal window.

    For each of the two dimensions, the environment variable, COLUMNS
    and LINES respectively, is checked. If the variable is defined and
    the value is a positive integer, it is used.

    When COLUMNS or LINES is not defined, which is the common case,
    the terminal connected to sys.__stdout__ is queried
    by invoking os.get_terminal_size.

    If the terminal size cannot be successfully queried, either because
    the system doesn't support querying, or because we are not
    connected to a terminal, the value given in fallback parameter
    is used. Fallback defaults to (80, 24) which is the default
    size used by many terminal emulators.

    The value returned is a named tuple of type os.terminal_size.
    """
    # Attempt to use the environment first
    try:
        columns = int(os.environ["COLUMNS"])
    except (__HOLE__, ValueError):
        columns = 0

    try:
        lines = int(os.environ["LINES"])
    except (KeyError, ValueError):
        lines = 0

    # Only query if necessary
    if columns <= 0 or lines <= 0:
        try:
            columns, lines = _get_terminal_size(sys.__stdout__.fileno())
        except (NameError, OSError):
            pass

    # Use fallback as last resort
    if columns <= 0 and lines <= 0:
        columns, lines = fallback

    return terminal_size(columns, lines)
dataset/ETHPy150Open chrippa/livestreamer/src/livestreamer_cli/packages/shutil_backport.py/get_terminal_size