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import psycopg2
import psycopg2.extensions
DEC2FLOAT = psycopg2.extensions.new_type(
psycopg2._psycopg.DECIMAL.values,
'DEC2FLOAT',
psycopg2.extensions.FLOAT)
psycopg2.extensions.register_type(DEC2FLOAT)
o = psycopg2.connect("dbname=test")
c = o.cursor()
c.execute("SELECT NULL::decimal(10,2)")
n = c.fetchone()[0]
print(n, type(n))
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