def list_model_screen(header):

    ready_screen("list_model_screen")
    screen.addstr(1, 1, header + " > List Model File ")
    screen.addstr(6, 6, "List of model(s): ")
    for i, model in enumerate(models_info):
         screen.addstr(8 + i, 10, "Model Number:[{0}] - Model path:[{1}] - Variables:[{2}]".format(str(i), model['directory'], model['variable_name']))
    screen.addstr(4, 4, "Return to Manage Model (press Enter) :")
    screen.getstr()
Produce the ``NULLS FIRST`` modifier for an ``ORDER BY`` expression.
dataset/ETHPy150Open apache/climate/RCMES/cli_app.py/list_model_screen--crossover with--dataset/ETHPy150Open goFrendiAsgard/kokoropy/kokoropy/packages/sqlalchemy/sql/elements.py/UnaryExpression._create_nullsfirst