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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _get_input_steps(self):
 """ Search and return all steps that have no parents. These are the steps that are get the input data. """

        input_steps = []

        for step in self.steps_sorted:
            parent_steps = self._parent_steps(step)

            if len(parent_steps) == 0:
                input_steps.append(step)

        return input_steps