def get_index_from_list(self, list_, value, start=0, end=None):
        if start == '':
            start = 0
        list_ = self.get_slice_from_list(list_, start, end)
        try:
            return int(start) + list_.index(value)
        except ValueError:
            return -1
Register external input variables.
dataset/ETHPy150Open shellderp/sublime-robot-plugin/lib/robot/libraries/Collections.py/_List.get_index_from_list--crossover with--dataset/ETHPy150Open zomux/deepy/deepy/layers/layer.py/NeuralLayer.register_external_inputs