How to use 'concatenate lists python' in Python

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9def concat(lists):
10 return list(it.chain(*lists))

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90 input_defs=[InputDefinition('xs', dagster_type=List[String])],
91 output_defs=[OutputDefinition(dagster_type=String)],
93def concat_list_py2(_, xs):
94 return ''.join(xs)

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