psql use query result convert decimal python numpy psycopg2

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1DEC2FLOAT = psycopg2.extensions.new_type(
2    psycopg2.extensions.DECIMAL.values,
3    'DEC2FLOAT',
4    lambda value, curs: float(value) if value is not None else None)
5psycopg2.extensions.register_type(DEC2FLOAT)
6

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