<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def decorate_several_with_validation(func, _out_=None, # type: ValidationFuncs none_policy=None, # type: int **validation_funcs # type: ValidationFuncs ):
 """ This method is equivalent to applying `decorate_with_validation` once for each of the provided arguments of the function `func` as well as output `_out_`. validation_funcs keyword arguments are validation functions for each arg name. Note that this method is less flexible than decorate_with_validation since * it does not allow to associate a custom error message or error type with each validation. * the none_policy is the same for all inputs and outputs :param func: :param _out_: :param validation_funcs: :param none_policy: :return: a function decorated with validation for all of the listed arguments and output if provided. """


    # add validation for output if provided
    if _out_ is not None:
        func = decorate_with_validation(func, _OUT_KEY, _out_, none_policy=none_policy)

    # add validation for each of the listed arguments
    for att_name, att_validation_funcs in validation_funcs.items():
        func = decorate_with_validation(func, att_name, att_validation_funcs, none_policy=none_policy)

    return func