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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 _extract_placeholder_weld_objects_at_index(dependency_name, length, readable_text, index):
 """Helper method that creates a WeldObject for each component of dependency. Parameters dependency_name : str The name of the dependency evaluating to a tuple. length : int Number of components to create WeldObjects for readable_text : str Used when creating the placeholders in WeldObject.context. index : str Representing a tuple of ints used to select from the struct. Returns ------- list of WeldObject """

    weld_objects = []

    for i in range(length):
        fake_weld_input = Cache.create_fake_array_input(dependency_name, readable_text + '_' + str(i), eval(index))
        obj_id, weld_obj = create_weld_object(fake_weld_input)
        weld_obj.weld_code = '{}'.format(obj_id)
        weld_objects.append(weld_obj)

        Cache.cache_fake_input(obj_id, fake_weld_input)

    return weld_objects