How to use 'unnest list python' in Python

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def _unnest(lists):
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    """
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    Used to unnest compound hypotheses. Used in Evaluator.eval only.
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    """
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    new_list = []
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    # the inner-most list should have a tuple as item 1
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    while lists and isinstance(lists[1], list):
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        new_list.insert(0, lists.pop(1))
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        lists = lists[0]
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    # grab the last one
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    new_list.insert(0, lists)
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    return new_list