def _is_hidden(field):
    if isinstance(field, HiddenField):
        return True
    if isinstance(field.widget, HiddenInput):
        return True
    return False
Returns a bool indicating whether the key exists
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/flask_wtf/form.py/_is_hidden--crossover with--dataset/ETHPy150Open ufora/ufora/ufora/distributed/S3/S3Interface.py/S3Interface.keyExists